Which of the following is the best definition of a chemical change?

Answers

Answer 1
well apparently... a chemical change occurs when the process produces a gas, light, smell, a fire or heat, or a color change, like melting solid ice changing into water is not a chemical change
Answer 2

Answer: A change in a substance where one or more new substances form

Explanation: Apex


Related Questions

Co(g)+h2o(g)⇌co2(g)+h2(g) kp=0.0611 at 2000 k a reaction mixture initially contains a co partial pressure of 1320 torr and a h2o partial pressure of 1760 torr at 2000 k. calculate the equilibrium partial pressure of co2.

Answers

Final answer:

We use the expression for Kp in terms of partial pressures, set up an equation incorporating the given initial pressures and the changes in pressure that occur as the reaction proceeds, and solve that equation to find the equilibrium partial pressure of CO2.

Explanation:

To answer this question, we need to use the expression for the equilibrium constant (Kp) in terms of partial pressures. Kp is defined as the ratio of the products of the partial pressures of the products, each raised to their stoichiometric coefficients in the balanced chemical equation, to the product of the partial pressures of the reactants, each raised to the power of their stoichiometric coefficients. Based on this, the expression is:

Kp = (pCO2 * pH2) / (pCO * pH2O)

where pCO, pH2O, pCO2 and pH2 are the equilibrium partial pressures of CO, H2O, CO2 and H2 at equilibrium, respectively. We know that initially, the partial pressure of CO2 and H2 is 0 because the reaction has not yet occurred. Also, the initial partial pressures of CO and H2O are given as 1320 torr and 1760 torr respectively.

As reaction proceeds to the right, the pressures of CO and H2O will decrease while that of CO2 and H2 will increase. Let's assume the decrease in the pressures of CO and H2O is by x.

Therefore, at equilibrium:

pCO = 1320 - xpH2O = 1760 - xpCO2 = xpH2 = x

So, plug these values into the Kp expression we get:

0.0611 = (x*x) / {[1320 - x]*[1760 - x]}

Solving this quadratic equation will give the value of x.

Substituting 'x' in pCO2 = x will give us the equilibrium partial pressure of CO2.

Learn more about Equilibrium and Kp here:

https://brainly.com/question/33598108

#SPJ12

Final answer:

The equilibrium partial pressure of CO2 in a chemical reaction can be calculated using an ICE table and the given Kp value in the application of Le Chatelier's principle.

Explanation:

The subject of this question is the calculation of the equilibrium partial pressure of CO2 in a chemical reaction according to Le Chatelier’s principle. We first identify the given Kp value and initial partial pressures for CO and H20. Using the equation for the reaction, CO(g) + H2O(g) ⇌ CO2(g) + H2(g), we can create an ICE (Initial, Change, Equilibrium) table to track changes in the partial pressures during the reaction. As the reaction proceeds, the concentrations of CO and H2O decrease while those of CO2 and H2 increase until equilibrium is reached. The changes for CO and H2O are negative while those for CO2 and H2 are positive. Using the equilibrium expressions and the given Kp value, we can solve for the change and add this to the initial concentrations to get the equilibrium concentrations.

Learn more about Chemical Equilibrium here:

https://brainly.com/question/3920294

#SPJ11

Why is the percentage of food eaten a good number to use ? Explain

Answers

To understand that you have to balance each food you intake in your body. Balancing your food is not only useful to make you stay fit but it can enhance your mental and physical health. With the use of proper diet, you will go on to your everyday routine without feeling uncomfortable.

name two fluid technologies that make use of water

Answers

Answer:

Fire extenguisher and refrigerator

Explanation:

Refrigerator : There are 5 basic components in refrigeration I.e. fluid refrigerant, a compressor which controls the flow of refrigerant; the condensor coil( on the outside of the fridge), evaporation coils( on the inside of the fridge) and something calls an expansion device.

The compressor constricts the refrigerant vapour,raising its pressure and pushes it in the coils on the outside of the refrigerator.When the hot gas in the coils meets the cooler air temperature of the kitchen it becomes a liquid.Now in the liquid form at high pressure, the refrigerant cools down as it flows into the coils inside the freezer and the fridge.The refrigerant absorbs the heat inside the fridge cooling down the air.Last the refrigerant evaporates to a gas then flows back to the compressor where the cycle starts all over.

Fire Extinguishers: Water performs two functions; its conversion tosteam absorbs the heat, and the steam displaces the air from the vicinity of the flame. Many siimple fire extinguishers  are quipped with hand pumps or sources of compressed gas to propel water through the nozzle.

Final answer:

Hydraulic systems and water turbines are two fluid technologies that make use of water. Hydraulic systems use water or other fluids to transmit force or energy, while water turbines use the flow of water to generate mechanical energy and produce electricity.

Explanation:

Two fluid technologies that make use of water are hydraulic systems and water turbines.

Hydraulic systems: These systems use water or other fluids to transmit force or energy. They are commonly used in heavy machinery, such as bulldozers and cranes. The force applied to a small piston can be amplified to produce a much larger force on a larger piston. This is done by Pascal's law, which states that a change in pressure of an enclosed fluid is transmitted uniformly in all directions.Water turbines: These devices use the flow of water to generate mechanical energy, which is then converted into electrical energy. Water turbines are often used in hydroelectric power plants, where the force of flowing water is used to turn the blades of the turbine, which in turn spins a generator to produce electricity.

Learn more about Fluid technologies that make use of water here:

https://brainly.com/question/9035490

#SPJ3

The part of the flower that becomes a fruit to protect the seeds is the _______. stigma style ovary anther

Answers

ovaryovaryovaryovary

ovary is your answer dude

Write balanced chemical equations for the two ionization steps of sulfuric acid

Answers

Hello!

Sulfuric acid (H₂SO₄) is a strong diprotic acid. "Diprotic" means that the acid donates 2 protons when dissociating in water to form ions. This happens in a series of two steps which are described below. The first reaction is basically a complete reaction while the second one is an equilibrium:

H₂SO₄(aq) + H₂O(l) → HSO₄⁻(aq) + H₃O⁺(aq)

HSO₄⁻(aq) + H₂O(l) ⇄ SO₄⁻²(aq) + H₃O⁺(aq)

Have a nice day!
Final answer:

Sulfuric acid ionizes in two steps, each releasing a hydrogen ion to form first the bisulfate ion and then the sulfate ion. The first is H2SO4 (aq) → H+ (aq) + HSO4- (aq) and the second is HSO4- (aq) → H+ (aq) + SO4^2- (aq).

Explanation:

The ionization of sulfuric acid (H2SO4) in water occurs in two steps. Each step involves the release of a hydrogen ion (H+), and the corresponding production of the hydronium ion (H3O+) is generally implied when the acid ionizes in aqueous solution.

First Ionization: H2SO4 (aq) → H+ (aq) + HSO4- (aq).This is the first ionization step where one hydrogen ion is released, creating the bisulfate ion (HSO4-).

Second Ionization: HSO4- (aq) → H+ (aq) + SO4^2- (aq). In the second ionization step, the bisulfate ion (HSO4-) releases a second hydrogen ion, resulting in the sulfate ion (SO4^2-).

Both of these equations are balanced chemical equations that depict the stepwise ionization of sulfuric acid and the formation of its conjugate bases.

classify correct or incorrect.
Convection only occurs in liquids?
All substances radiate heat?
our body temp. is always equal to the temp. around us?

Answers

Answer:

1. Incorrect, it occurs in gases as well or generally in fluids.

2. Correct.

3. Incorrect.

Explanation:

Hello,

1. Convection, is a heat transport phenomena which occurs when a fluid transfers energy in the form of heat to a surface or vice-versa, in such a way, it occurs fluid, say, in both gases and liquids.

2. In this case, radiation is a heat transfer phenomena which occurs by thermal waves transferring the heat; such waves are generated by a hot body which it is said to irradiate the waves by cause of its inner temperature, therefore, as it could be surrounded by a colder space, heat is transferred. As a result of the high temperature, all substances could radiate heat.

3. In this case, it is widely known that normal temperature is between 20 and 25 ºC while the body's inner temperature is about 37 ºC for our organism to work properly. In such a way, those temperatures are different.

Best regards.

which is a dangerous thing to do when working with flames in a laboratory?

Answers

In laboratories, there are many different types of substances and chemicals. It is dangerous to work with flames in a laboratory because there could very likely be flammable or explosive material in the laboratory that could harm assistants and researchers.
it can be chemicals, flames, unknown substances
those are dangerous

The reaction of hydrogen peroxide with iodine, h2o2(aq)+i2(aq)⇌oh−(aq)+hio(aq) is first order in h2o2 and first order in i2. if the concentration of h2o2 was increased by half and the concentration of i2 was quadrupled, by what factor would the reaction rate increase?

Answers

when H2O2 & i2 is a first order and the rate can be as the following:
rate = K [H2O2]^1 [i2]^1
and by assuming that [H2O2] & [i2] = 1 so by substitution 
the rate = K (1) (1) = 1 
and when H2O2 increase by half it becomes 1.5 and when i2 increase by quadruple it becomes 4.
by substitution:
the rate = K (1.5)(4) = 6 
So the rate will increase by factor 6

The reaction rate for H₂O₂(aq) + I₂(aq) ⇌ OH⁻(aq) + HIO(aq) increases by a factor of 6 when the concentration of H₂O₂ is increased by half and the concentration of I₂ is quadrupled.

The rate of a reaction is influenced by the concentrations of the reactants. For the reaction H₂O₂(aq) + I₂(aq) ⇌ OH⁻(aq) + HIO(aq), the rate law is given by: Rate = k[H₂O₂][I₂]

This indicates that the reaction is first order with respect to both H₂O₂ and I₂.

Step-by-Step Explanation:

Initial Reaction Rate: The initial rate can be expressed as Rate_initial = k[H₂O₂]₀[I₂]₀.Change in Concentrations: The concentration of H₂O₂ is increased by half (1.5 times) and the concentration of I₂ is quadrupled (4 times).New Rate Calculation: The new rate can be expressed as Rate_new = k(1.5[H₂O₂]₀)(4[I₂]₀).Rate Increase Factor: To determine by what factor the rate increases, divide the new rate by the initial rate:

Rate increase factor = (k(1.5[H₂O₂]₀)(4[I₂]₀)) / (k[H₂O₂]₀[I₂]₀) = 1.5 * 4 = 6.

Therefore, the reaction rate increases by a factor of 6.

Two teaspoons of salt are added to a glass of water which is then stirred until no more salt grains can be seen. Two more teaspoons are added and stirring is continued, but the salt grains are still evident in the glass and settle to the bottom. After the addition of the last two teaspoons of salt the solution is ___________________________.
nonpolar
polar
saturated
unsaturated

Answers

Hello!

After the addition of the last two teaspoons of salt, the solution is saturated

A solution is saturated when it has the highest amount of solute (in this case the salt) that the solvent (in this case the water) can dissolve at that pressure and temperature. 

Visually, a saturated solution can be detected when the adding of more solute results in the settling of solute grains (in this case salt) at the bottom of the container, because the solvent couldn't dissolve them at that pressure and temperature. That's why we can say that the solution is saturated.

Have a nice day!  

Answer: C

Explanation: I got it right

The reaction 2a → a2​​​​​ was experimentally determined to be second order with a rate constant, k, equal to 0.0265 m–1min–1. if the initial concentration of a was 4.00 m, what was the concentration of a (in m) after 180.0 min?

Answers

The integrated rate law for a second-order reaction is given by:

[tex] \frac{1}{[A]t} = \frac{1}{[A]0} + kt [/tex]

where, [A]t= the concentration of A at time t,

[A]0= the concentration of A at time t=0

k = the rate constant for the reaction


Given: [A]0= 4 M, k = 0.0265 m–1min–1 and t = 180.0 min


Hence, [tex] \frac{1}{[A]t} = \frac{1}{4} + (0.0265 X 180) [/tex]

                                        = 4.858

Therefore, [A]t= 0.2058 M.


Answer: Concentration of A, after 180 min, is 0.2058 M

Answer: 0.199M


Explanation:


1) An initial clarification: the unit of the concentration is M (molarity) and not m as it was written in the question (m is used for molality, and that is other unit of concentration).


2) Second order reaction means that the rate of reaction is given by:


r = - d[A]/dt = [A]²

3) By integration you get:


1 / [A] - 1[Ao] = kt


=> 1 / [A] = 1 / [Ao] + kt


4) Plug in the data; [Ao] = 4.00M; k = 0.0265 (M⁻¹) (min)⁻¹; t = 180 min

=> 1 / [A] = 1 / 4.00M + 0.0265 (M⁻¹)(min⁻¹) (180min) = 5.02 (M⁻¹)


=> [A] = 1 / (5.02(M⁻¹) = 0.199 M




liam uses a machine that counts waves on a metal cable. The machine counts 25 waves in 2 seconds. what is the frequency of the wave?

Answers

Frequency is defined as the number of waves per second. In this machine 25 waves pass in one second.
We need to calculate the number of waves that pass a particular point during one second.
During 2 seconds -25 waves
Therefore in one second - 25/2 = 12.5 waves/s.
1 wave per second has the unit Hertz (Hz)
Therefore answer is 12.5 Hz

Final answer:

The frequency of the waves on the metal cable that Liam is using is calculated by dividing the number of waves, which is 25, by the time period over which they are counted, which is 2 seconds. This results in a frequency of 12.5 Hertz (Hz).

Explanation:

The question asks us to determine the frequency of a wave given the number of waves and the time it took for those waves to be counted. In this case, Liam's machine counts 25 waves in 2 seconds. Frequency is the number of waves that pass a given point in one second, and it is measured in Hertz (Hz).

To calculate the frequency, you divide the number of waves by the period. Using the information from the question:

Count of waves passing by 25 wavesTime period: 2 seconds.

Frequency (f) = Number of waves / Time (T) = 25 waves / 2 s = 12.5 Hz. Hence, the frequency of the waves on the metal cable is 12.5 Hertz.

What is the formula for copper(ii) phosphate? capitalization and punctuation count!?

Answers

Hello!

The formula for Copper (II) Phosphate is

Cu₃(PO₄)₂

To know how to write this formula we go from left to right. First, Copper (II). It means that the formula has the Cu⁺² ion. Now, Phosphate means that the compound has the PO₄⁻³ ion. Now we combine this two ions, giving to each one the coefficient with the number of the electric charge of the other (e.g. to Cu⁺² we'll give the charge of PO₄⁻³ which is 3 and the result will be Cu₃⁺²). 

The combination gives us the result Cu₃(PO₄)₂

Have a nice day!

Calculate the heat capacity, in joules per degree and in calories per degree, for 45.8 g of nitrogen gas. [heat capacity of n2(g)= 1.04j/g0c] [1 cal=4.184j]

Answers

Answer : The heat capacity in joules per degree Celsius and calories per degree Celsius is, [tex]47.6J/^oC[/tex] and [tex]11.4cal/^oC[/tex] respectively.

Explanation : Given,

Mass of nitrogen gas = 45.8 g

Heat capacity of nitrogen gas = [tex]1.04J/g^oC[/tex]

First we have to calculate the heat capacity in joules per degree Celsius.

As, 1 gram of nitrogen gas has heat capacity = [tex]1.04J/^oC[/tex]

So, 45.8 gram of nitrogen gas has heat capacity = [tex]45.8\times 1.04J/^oC=47.6J/^oC[/tex]

Thus, the heat capacity in joules per degree Celsius is [tex]47.6J/^oC[/tex]

Now we have to calculate the heat capacity in calories per degree Celsius.

As we are given the conversion:

[tex]1cal=4.184J\\\\1J=\frac{1}{4.184}cal[/tex]

So, the heat capacity of nitrogen gas = [tex]\frac{1}{4.184}cal\times 47.6\text{ per }^oC=11.4cal/^oC[/tex]

Thus, the heat capacity in calories per degree Celsius is [tex]11.4cal/^oC[/tex]

The heat capacity, in Joules per degree Celsius and in calories per degree Celsius are 47.632 J/g°C and 11.384 cal/g°C respectively.

Given the following data:

Mass of nitrogen gas = 45.8 gramsHeat capacity of nitrogen gas = 1.04 J/g°C

To find the heat capacity, in Joules per degree Celsius and in calories per degree Celsius:

By direct proportion:

1 gram of nitrogen gas = 1.04 J/g°C

45.8 grams of nitrogen gas = X J/g°C

Cross-multiplying, we have:

[tex]X = 45.8 \times 1.04[/tex]

X = 47.632 J/g°C.

Therefore, the heat capacity, in Joules per degree Celsius, for 45.8 grams of nitrogen gas is 47.632 J/g°C.

In calories per degree Celsius:

1 calorie = 4.184 Joules

Y calorie = 47.632 Joules

Cross-multiplying, we have:

[tex]Y \times 4.184 = 47.632\\\\Y = \frac{47.632}{4.184}[/tex]

Y = 11.384 cal/g°C.

Read more: https://brainly.com/question/18877825

The sticky top of the pistil that collects the pollen (sperm) is the _______. ovary
style
stigma
anther

Answers

I think the answer is stigma.
I hope I helped!
The answer is the stigma.   You can remember it as the sticky stigma!                           Hope this helps!

Consider these reactions, where M represents a generic metal. 2M(s)+6HCl(aq)⟶2MCl3(aq)+3H2(g)ΔH1=−556.0 kJ HCl(g)⟶HCl(aq) ΔH2=−74.8 kJ H2(g)+Cl2(g)⟶2HCl(g) ΔH3=−1845.0 kJ MCl3(s)⟶MCl3(aq) ΔH4=−342.0 kJ Use the given information to determine the enthalpy of the reaction 2M(s)+3Cl2(g)⟶2MCl3(s)

Answers

Chemical reaction 1: 2M(s)+6HCl(aq)⟶ 2MCl3(aq)+3H2(g); ΔH1=−556.0 kJ. Chemical reaction 2: HCl(g) ⟶ HCl(aq); ΔH2=−74.8 kJ.
Chemical reaction 3: H2(g)+Cl2(g) ⟶ 2HCl(g); ΔH3=−1845.0 kJ
Chemical reaction 4: MCl3(s) ⟶ MCl3(aq); ΔH4=−342.0 kJ.
Chemical reaction 5: 2M(s)+3Cl2(g) ⟶ 2MCl3(s); ΔH5 = ?.ΔH5 = ΔH1 + 6·ΔH2 + 3·ΔH3 - 2·ΔH4.
ΔH5 = -550 kJ + 6·(-74,8 kJ) + 3·(-1845 kJ) - 2·(-342 kJ).
ΔH5 = -550 kJ - 448,8 kJ - 5535 kJ + 684 kJ.
ΔH5 = -5849,8 kJ.

The enthalpy of formation of [tex]\rm MCl_3[/tex] will be -5849 kJ.

The given reactions represent:

Enthalpy of reaction of M with HCl = [tex]\rm \Delta H_1[/tex] = -556 kJ

Enthalpy of sublimation of HCl = [tex]\rm \Delta H_2[/tex] = -74.8 kJ

Enthalpy of HCl formation = [tex]\rm \Delta H_3[/tex] = -1845 kJ

Enthalpy of sublimation of [tex]\rm MCl_3\;=\;\Delta H_4[/tex] = -342.0 kJ

The enthalpy of formation of [tex]\rm MCl_3[/tex] will be: [tex]\rm \Delta H_5[/tex]

[tex]\rm \Delta H_5[/tex] = [tex]\rm \Delta H_1\;+\;6\;\times\;\Delta H_2\;+\;3\;\times\;\Delta H_3\;-\;2\;\times\;\Delta H_4[/tex]

= -550 + 6 (-74.8) + 3 (-1845) - 2 (342)

= -5849 kJ.

The enthalpy of formation of [tex]\rm MCl_3[/tex] will be -5849 kJ.

For more information about enthalpy of formation, refer to the link:

https://brainly.com/question/14563374?referrer=searchResults

An experiment carries out the reaction a → products at three different initial concentrations of a and the initial reaction rate were measured, as indicated in the table. [a](m) initial rate (m/s) 0.15 0.010 0.30 0.040 0.45 0.090 based on this data, what is the rate law for the reaction? view available hint(s) an experiment carries out the reaction at three different initial concentrations of and the initial reaction rate were measured, as indicated in the table. initial rate 0.15 0.010 0.30 0.040 0.45 0.090 based on this data, what is the rate law for the reaction? rate = k[a]2 rate = k[a]3 rate = k[a] rate = k

Answers

first lets tabulate the data
                 [a]                              rate  (m/s)
              0.15                             0.010
              0.30                             0.040
              0.45                             0.090            
x - order of reaction with respect to a
since a is the only reactant, the order with respect to a is the order of the reaction 
rate equation;
Rate = k [a]ˣ
where k - rate constant 
substituting rate values and [a]
0.010  = k[0.15 ]ˣ----1)
0.040  = k [0.30]ˣ----2)
divide 2 by 1
4 = 2ˣ
x = 2
therefore order with respect to a is 2
this is therefore a second order reaction 
Rate = k [a]²


dentify which stage of the listening process is occurring in the following scenario.

Janie excitedly told her mom about a party her friend Reeve had invited her to. She promised that there would be adult supervision and begged to be allowed to go. Her mom hesitated and then said she wanted to talk to Reeve's parents first.

selecting

understanding

evaluating

responding

remembering

Answers

Final answer:

In this situation, the listening process stage being implemented is 'evaluating'. Janie's mom is assessing the details of the party and deciding about its validity and reliability, which indicates this stage.

Explanation:

In the given scenario, the stage of the listening process that is taking place is evaluating. The event happens as Janie's mom listens to Janie's account of the party and makes a judgment about it. It means she's weighing the information she has received and is deciding on its validity and reliability. After listening to the information, she makes an evaluation that requires her to speak to Reeve's parents first before making a decision. This is the evaluating stage, where she is assessing and judging the information she has received.

Learn more about Listening process here:

https://brainly.com/question/23918388

#SPJ12

Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is followed by scandium (atomic number 21). Which element should have the largest atomic radius? A) potassium B)calcium C)scandium D)All three have the same atomic radius.

Answers

While staying in the same period, if we move from left to right across the period, the atomic radius decreases. The reason is, in a period the number of shells remain the same and the number of electrons and protons increase as we move across the period to the right. The increased electrons and protons attract each other with greater force and hence the atomic size decreases. 

So the element on the left most will have the largest atomic radius. So the correct ans is Potassium. Potassium will have the largest atomic size among Potassium, Calcium and Scandium. 
Final answer:

According to trends in the periodic table, the atomic radius decreases from left to right across a period. Therefore, potassium, being furthest to the left, would have the largest atomic radius followed by calcium and then scandium.

Explanation:

The subject of this question is the atomic radius of elements on the periodic table, specifically potassium, calcium, and scandium. The atomic radius generally decreases as you go from left to right across a period in the periodic table due to the increasing positive charge of the nucleus (i.e., the increasing atomic number), which draws the electrons closer to the nucleus, thereby decreasing the atomic radius.

In the case of potassium (atomic number 19), calcium (atomic number 20), and scandium (atomic number 21)

, potassium should have the largest atomic radius, followed by calcium, and then scandium with the smallest atomic radius.

Learn more about Atomic Radius here:

https://brainly.com/question/32036952

Calculate the empirical formula for each natural flavor based on its elemental mass percent composition.
a. methyl butyrate (component of apple taste and smell): c 58.80%, h 9.87%, o 31.33%

Answers

the complete question is;
Calculate the empirical formula for each of the following naturalflavors based on their elemental mass percent composition.

Q1)
methyl butyrate (component of apple taste andsmell):  C -58.80 %  H- 9.87 % 
O -31.33.%Express your answer as a chemical formula.


Q2)
vanillin (responsible for the taste and smellof vanilla):  C - 63.15%  H- 5.30 % 
O - 31.55%Express your answer as a chemical formula.

Q1)
empirical formula is the simplest ratio of whole number of elements in the compound. as the percentages have been given, lets calculate for 100 g of compound 
                                          C                         H                         O
mass                             58.80 g                  9.87 g                   31.33
molar mass                   12 g/mol                 1 g/mol                 16 g/mol
number of moles           58.80/12                9.87/1                    31.33/16
                                      = 4.9                      =9.87                     = 1.95
then divide number of moles by least number of moles - 1.95 in this case
                                      4.9/1.95 = 2.51      9.87/1.95 = 5.06    1.95/1.95= 1
next multiply by 2 to get numbers that can be rounded off to whole numbers
                                       2.51x2 = 5.02        5.06x2 = 10.12      1x2 = 2
when rounded off to the nearest whole number 
C - 5
 H - 10
 O - 2
therefore empirical formula is C₅H₁₀O₂

Q2) for this too since elemental composition has been given in percentages lets calculate for 100 g of compound 
                                          C                         H                         O
mass                               63.15 g                5.30 g                 31.55 g
molar mass                     12 g/mol              1 g/mol                16 g/mol
number of moles             63.15/12             5.30/1                  31.55/16
                                        =5.26                  =5.30                   =1.97
divide the number of moles by the least number of moles - 1.97
                                        5.26/1.97            5.30/1.97               1.97/1.97 
                                        =2.67                   = 2.69                      = 1
multiply each by 3 to get numbers that can be rounded off to whole numbers
                                        2.67x3 = 8.01     2.69x3 = 8.07         1x3 = 3
rounded off to the nearest whole numbers 
C - 8
H - 8
O - 3
empirical formula = C₈H₈O₃

oxidation states of N2 + 3H2 --> 2NH3

Answers

True because n on both sides are 2 and the hydrogen on both sides are 6

if f(x)= 5x^3 -2 and g(x) =2x+1, find (f+g)(x)

a. 10x^3 -2
b. 3x^3 -1
c. 5x^3+2x-1
d. 3x^2 -1

Answers

After calculating your answer would be c 5x^3+2x-1

Write the chemical equation for the reaction of propylamine, c3h7nh2 with water. (include all phases in your answer)

Answers

Answer is:

CH₃-CH₂-CH₂-NH₂ + H₂O(l) ⇄ CH₃-CH₂-CH₂-NH₃⁺(aq) + OH⁻(aq).

Amine group (-NH₂) has neutral charge, bet when accepts one proton (H⁺) has positive charge.
Amines are compounds that contain a basic nitrogen atom with a lone pair of electrons. Amines are derivatives of ammonia, where is one or more hydrogen atoms replaced by a substituent such as an alkyl or aryl group (in this compound propyl group).

Propylamine accepts a proton from water according to the reaction equation; C3H7NH2(aq) + H2O(l) ------> C3H7NH3^+(aq) + OH^-

Propylamine is a base because it accepts a proton. Recall that according to Brownstead - Lowry, a base is any substance that accepts a proton while an acid is any substance that donates a proton. Propylamine accepts a proton because of the lone pair on nitrogen atom.

The reaction of propylamine with water is an acid base reaction because propylamine accepts a proton from water as follows;

C3H7NH2(aq) + H2O(l) ------> C3H7NH3^+(aq) + OH^-

Learn more: https://brainly.com/question/5803619

What is the pH of a solution of 0.750 M KH2PO4, potassium dihydrogen phosphate?

Answers

Final answer:

The pH of a 0.750 M KH₂PO₄ solution cannot be accurately determined without additional information such as the pKa value of the dihydrogen phosphate ion (H₂PO₄₋).

Explanation:

The pH of a solution of 0.750 M KH₂PO₄, potassium dihydrogen phosphate, depends on the acid dissociation constants of phosphoric acid (H₃PO₄), as KH₂PO₄ is its conjugate salt. Typically, to calculate the pH of such a solution, one would use the Henderson-Hasselbalch equation which relates the pH of a buffer solution to the pKa of the acid and the concentrations of the acid and its conjugate base.

However, because there is no other species like phosphoric acid or its other salts present to form a buffer system, and because H₂PO₄₋ (from dissociation of KH₂PO₄) is a weak acid, we may need to approach this problem differently.

Since the direct calculation of pH in this context isn't possible without additional information such as the pKa value of the dihydrogen phosphate ion (H₂PO₄⁻), and because the problem does not ask for assumptions to be made or provide a relevant pKa value, the task cannot be completed.

In practical applications, a pKa value would be required to use the Henderson-Hasselbalch equation, or for the weak acid formula: pH = -log[H⁺] where [H⁺] can be obtained through the equilibrium expression involving the dissociation constant (Ka) and the concentration of H₂PO₄⁻.

Give the empirical formula of a compound that contains 11.6g iron and 5.01 g of oxygen

Answers

Fe2O3 is the answer.

Good luck :)

part a: What volume of 10.0 M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl?
answer : 6.7ml
Part B: The buffer from Part A is diluted to 1.00 L. To half of it (500. mL), you add 0.0200 mol of hydrogen ions without changing the volume. What is the pH of the final solution?
answer : pH 7.28
Part C: What additional volume of 10.0 M HCl would be needed to exhaust the remaining capacity of the buffer after the reaction described in Part B? In other words, how much more of this HCl solution is required to consume the remaining Tris in the buffer?

HELP ME FOR PART C PLEASE!!!

Answers

Final answer:

To calculate the volume of 10.0 M HCl needed to exhaust the remaining capacity of the buffer, determine the moles of TrisHCl remaining after adding hydrogen ions and use stoichiometry to calculate the required volume.

Explanation:

To calculate the additional volume of 10.0 M HCl needed to exhaust the remaining capacity of the buffer, we need to determine the number of moles of TrisHCl that remain after adding 0.0200 mol of hydrogen ions to half of the buffer. This will give us the amount of TrisHCl that needs to be neutralized. From there, we can calculate the volume of 10.0 M HCl needed to neutralize the remaining TrisHCl.

First, calculate the moles of TrisHCl in the initial buffer solution. Use the given mass of TrisHCl (31.52 g) and its molar mass to calculate the moles.Next, calculate the moles of TrisHCl that were neutralized by adding 0.0200 mol of hydrogen ions. Subtract this value from the moles of TrisHCl calculated in step 1.Finally, calculate the additional volume of 10.0 M HCl needed to neutralize the remaining moles of TrisHCl. Use the balanced equation for the reaction between TrisHCl and HCl to determine the stoichiometric ratio between the two substances.

The calculated volume will be the additional volume of 10.0 M HCl needed to exhaust the remaining capacity of the buffer.

Learn more about Volume calculation here:

https://brainly.com/question/33318354

#SPJ3

An additional 18 mL of 10.0 M HCl is required to exhaust the remaining capacity of the buffer. This is determined by calculating the amount of Tris that remains unreacted and can further neutralize HCl.

What additional volume of 10.0 M HCl would be needed to exhaust the remaining capacity of the buffer after the reaction described in Part B?

First, we need to understand the capacity of the buffer system. From Part A, we have 31.52 g of TrisHCl.

Step 1: Calculate the moles of TrisHCl.

Molecular Weight of TrisHCl = 157.60 g/molMoles of TrisHCl = 31.52 g / 157.60 g/mol = 0.20 mol

Step 2: Calculate the initial moles of Tris (conjugate base) and TrisH+ (conjugate acid).

From Part B, 0.0200 mol of hydrogen ions were added to the buffer.This will react with 0.0200 mol of Tris to form TrisH+, leaving 0.18 mol of Tris and 0.20 mol of TrisH+.

Step 3: Determine the remaining capacity to neutralize more HCl.

Moles of Tris available to react = 0.18 mol (since it can accept more H+ from HCl).

Step 4: Calculate the volume of 10.0 M HCl needed to exhaust the buffer.

Moles of HCl needed = 0.18 molVolume of HCl = Moles / Concentration = 0.18 mol / 10.0 M = 0.018 L = 18 mL

Therefore, an additional 18 mL of 10.0 M HCl is required to exhaust the remaining capacity of the buffer.

: calculate the mass of the solute in 1.500 l of 0.30 m glucose, c6h12o6, used for intravenous injection

Answers

Answer is: the mass of the glucose is 81,07 grams.
c(C₆H₁₂O₆) = 0,3 M = 0,3 mol/L.
V(C₆H₁₂O₆) = 1,500 L.
n(C₆H₁₂O₆) = c(C₆H₁₂O₆) · V(C₆H₁₂O₆).
n(C₆H₁₂O₆) = 0,3 mol/L · 1,5 L.
n(C₆H₁₂O₆) = 0,45 mol.
m(C₆H₁₂O₆) = n(C₆H₁₂O₆) · M(C₆H₁₂O₆).
m(C₆H₁₂O₆) = 0,45 mol · 180,156 g/mol.
m(C₆H₁₂O₆) = 81,07 g.

A solution of hydrochloric acid is mixed with an equal volume solution of barium hydroxide. When pH paper is inserted into the resulting solution, the pH was determined to be 7.0. If the initial concentration of the hydrochloric acid solution was 0.5 M, what is the concentration of the barium hydroxide solution?

Please explain your steps and balanced equation.

Answers

the balanced equation for the reaction between Ba(OH)₂ and HCl is ;
Ba(OH)₂ + 2HCl ----> BaCl₂ + 2H₂O
When equal volumes of both acid and base are added, the pH is 7 which means its neutral. 
This means that the H⁺ ions and OH⁻ are equal and they have neutralised each other. All the ions have reacted to form water molecules.
Dissociation of base and acid are as follows;
Ba(OH)₂ ---> Ba²⁺ + 2OH⁻
1 mol of Ba(OH)₂ dissociates to 2 mol H⁺
HCl ---> H⁺ + Cl⁻
n moles of HCl give out n mol of H⁺ ions
H⁺ = OH⁻ which is why solution is neutral
then OH⁻ moles present are n  mol 
then Ba(OH)₂ moles present should be n/2 mol
molarity of HCl = 0.5 mol/L
since volumes are equal number of moles are directly proportional to molarity 
molarity of Ba(OH)₂ = 0.5/2 = 0.25 M

Please help!
Explain what happens to the pitch of a cell phone ring when the amplitude of a sound wave increases. Justify your reasoning using complete sentences and key vocabulary.

Answers

Pitch is sometimes defined as the fundamental frequency of a sound wave. For most practical purposes, this is fine, and pitch and frequency can be thought of as equivalent. On the other hand, for most practical purposes, amplitude can be thought of as volume.

However, technically, pitch and volume are human perceptions. Thus, our perception of pitch and volume are not solely based on frequency and amplitude respectively, but are based on a combination of both. Frequency overwhelming dictates perceived pitch, but amplitude also does have some small, small effect on our pitch perception, especially when it is very large. For example, a very loud sound can have a different perceived pitch than you would predict from its frequency alone.

Hope that helps!

This solution contains equal concentrations of both hf(aq) and naf(aq). write the proton transfer equilibrium (net ionic) reaction that includes f– as a reactant. include states of matter.

Answers

Net ionic reaction for the solution containing equal concentrations of both HF(aq) and NaF(aq) is as follow:
F⁻(aq) + H₂O(l) ⇄ HF(aq) + OH⁻(aq)

In a reaction of NaF and H₂O, NaOH and HF is produced.

The reaction can be shown as follows:

HF(aq.) + OH⁻(aq.) ----->F⁻(aq.) + H₂O(l)

Or it can be shown as below:

Here the reactants are: NaF, H₂O

While the product is: NaOH, HF

So the reaction in ionic can be shown as:

HF(aq.) + OH⁻(aq.) ----->F⁻(aq.) + H₂O(l)

So the reaction can be that includes the states of matter too can be:

HF(aq.) + OH⁻(aq.) ----->F⁻(aq.) + H₂O(l)

convert the following names to balanced formulas.


lead(IV) sulfide

why is it not Pb2S4 ?

Answers

You can reduce the charges and subscripts so it is PbS2

The balanced chemical formula for lead(IV) sulfide is PbS₂, not Pb₂S₄. This correctly balances lead's +4 charge with two sulfur atoms, each with a -2 charge.

Lead(IV) sulfide is a chemical compound consisting of lead (Pb) and sulfur (S). The Roman numeral IV indicates that lead has an oxidation state of +4 in this compound. Sulfur commonly has an oxidation state of -2.

To form a neutral compound, we need to balance the charges. Lead(IV) has a charge of +4, and sulfur has a charge of -2. Therefore, it takes two sulfur atoms to balance one lead atom.

The balanced chemical formula for lead(IV) sulfide is PbS₂, not Pb₂S₄. The latter formula incorrectly represents the proportions since it can be simplified to PbS₂, as both share the same ratio.

Lead (IV) Sulfide: PbS₂Lead has an oxidation state of +4 (Pb₄+).Sulfur has an oxidation state of -2 (S₂-).The formula must balance to zero, i.e., 1(4+) + 2(2-) = 0.

Thus, the correct balanced chemical formula is PbS₂.

Other Questions
John and Matt are going to fill a pool with 2 different sized hoses. John can fill the pool in 5 hours, while Matt can complete it in 10 hours. Explain each step in solving this equation. Catherine finds that in a randomly selected sample of 500 families in her home town, 45% own at least one computer. Her research shows that there are a total of 35,000 families in her town. Which statements are true? Select each correct answer. A To estimate the percentage well, she would need to collect data for all 35,000 families. B Since her sample was randomly selected, she can reasonably infer that about 45% of the 35,000 families in her town own at least one computer. C If she collected data for a random sample of 1000 families in her home town, then that percentage would be a better estimate for the percentage of all 35,000 families that own a computer. D Since her sample was only 500 families, it is not possible that the percentage is a good estimate for the percentage of all 35,000 families that own a computer. What educator wore the very influential book democracy and education What roles did colonies play in the global economy The rococo style was influenced by the A. plight of the common workerB. Church's desire to counter the Reformation movement.C.extravagance of VersaillesD. Catholic church's religious austerity The English colonies of New York and New Jersey were originally _____. The table below shows the population of different duck species at a local pond. Which term best describes the total number of Mallards in the pond? The two general kinds of trade barriers are _____.a. qualitative and quantitative barriersb. voluntary and involuntary barriersc. tariff barriers and nontariff barriersd. government import standards and industry import standardse. nationalistic and geocentric barriers "which part of the cell would be of most interest when in studying production of atp and nadph?" i dont get this. can you explain Find the absolute maximum and minimum values of the following function on the given interval. If there are multiple points in a single category list the points in increasing order in x value and enter N in any blank that you don't need to use.f(x)=9x^327x+9, [0,3], A condition that affects the ability to sleep or the quality of sleep is referred to as a __________. A. parasomnia B. sleep disorder C. sleep debt D. night terror Nineteenth-century novelists such as victor hugo wrote sweeping portraits of Which shows a correct order to solve this story problem? Simone was arranging a party for some friends. She needed 25 balloons and 12 packs of napkins. Napkins cost $4.50 per pack and balloons cost $0.75 each. How much money did Simone spend?A.Step 1: Multiply $0.75 by 12.Step 2: Multiply $4.50 by 25.Step 3: Add the two products.B.Step 1: Add $0.75 and 12.Step 2: Add $4.50 and 25.Step 3: Multiply the two sums.C.Step 1: Multiply $0.75 by 25.Step 2: Multiply $4.50 by 12.Step 3: Add the two products.D.Step 1: Calculate the cost of 1 napkin.Step 2: Multiply $0.75 by 25.Step 3: Add the two numbers together. According to Critical Race Theorists, why are narratives or counterstories important and how would the inclusion of these stories address the effects of racial oppression? Which part of the brain serves to regulate the endocrine system ? Adrenal gland ThymusHypothalamus Thyroid Ikea employees are inspired to work hard by an anecdote from their swedish founder, invar kamprad, who told how he was berated by his father for failing repeatedly to get out of bed to milk the cows on his family's farm. then one day he got an alarm clock. "now by jiminy, i'm going to start a new life,' he determined, setting the alarm for twenty to six and removing the off button.'" invar kamprad is an example of a(n) Subtilisin is used in some laundry detergents to help remove protein-type stains. what unusual kind of stability does this suggest for subtilisin? ben helps his dad make chicken soup. their recipe makes 15 cups of soup. if they each eat 2 cups and freeze the rest will the leftovers fit in a 64 ounce container? 1 cup = 8 ounces what is the difference between a major and minor character