Chemistry High School

C3h8 + 5 o2 --> 3 co2 + 4 h2o this is an example of a _______________.

Answers

Answer 1
Answer:
combustion reaction

Explanation:
In chemistry, a combustion reaction is defined as a reaction between an oxidant and any compound that leads to the production of another compound along with a huge amount of heat.

Now, let's check the reaction given:
C₃H₈ + 5 O₂ --> 3 CO₂ + 4 H₂O
The oxidant is oxygen gas
The compound reacting is propane
The compound produced is carbon dioxide along with water vapor and heat

Therefore, the given reaction is a combustion reaction

Hope this helps :)
Answer 2

Answer: [tex]C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex] this is an example of a combustion reaction.

Explanation:

A reaction in which a compound reacts with oxygen and results in the formation of carbon dioxide and water is known as combustion reaction.

For example, [tex]C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex] is a combustion reaction.

Also, it is known that combustion reactions are exothermic in nature because heat is released during these reactions.

Related Questions

What was the total demand by all counties for water from the Sweetbriar River Basin in 1970? What is it projected to be in 2020?

Answers

Hey! 559 million kiloliters in 1970 and 1,476 million kiloliters in 2020.
 559 million kiloliters in 1970 and 1,476 million kiloliters in 2020.

Hope this helpsssssssssssss!!!

Nitrogen reacts with oxygen to form two compounds. compound a contains 2.8 g of nitrogen for each 1.6 g of oxygen. compound b contains 5.6 g of nitrogen for each 9.6 g of oxygen. what is the lowest whole-number mass ratio of nitrogen that combines with a given mass of oxygen?

Answers

Answer 1:
For compound A:
2.8 g of nitrogen for each 1.6 g of oxygen
Atomic weight of N = 14
Atomic weight of O = 16
Thus, number of moles of N = 2.8/14 = 0.2
and number of moles of O = 1.6/16 = 0.1

Thus, molar ratio of N and O in compound is 2:1.

Therefore, lowest whole-number mass ratio of nitrogen that combines with a given mass of oxygen is 2:1. And the compound formed is N2O.
.........................................................................................................................

Answer 2:
For compound B:
5.6 g of nitrogen for each 9.6 g of oxygen
Atomic weight of N = 14
Atomic weight of O = 16
Thus, number of moles of N = 5.6/14 = 0.4
and number of moles of O = 9.6/16 = 0.6

Thus, molar ratio of N and O in compound is 4:6 = 2:3.

Therefore, lowest whole-number mass ratio of nitrogen that combines with a given mass of oxygen is 2:3. And the compound formed is N2O3.
A 2.8 / 1.6 = ____
or
b 5.6 / 9.6 = ____

(obviously neither is a whole number)

We need to assume 100g of Nitrogen.

m (2.8 / 1.6) + n (5.6 / 9.6 ) = k(100)

where:

k = integer
m and n = grams of oxygen in each compound

Solution:

m = 100-n
(100 - n) (2.8 / 1.6) + n (5.6 / 9.6) = 100k
(100 - n) 1.75 + 0.583n = 100k
-1.166n = 100k -1.75
n = -85.71k + 150

if k=1,
n = 14.3
m =85.7

thus,

one has grams O =100, grams N = 14.3 * 2.8 / 1.6 + 85.7 * 5.6 /9.8 = 25.7 + 50g N or 75g N

the ration of N/O is 3/1 or rather 3:1

How many times greater is the rate of effusion of molecular fluorine than that of molecular bromine at the same temperature and pressure?

Answers

According to Graham's law the rates of effusion of two gases are inversely proportional to the square roots of their molar masses at the same temperature and pressure: Effusion is used to describe the passage of a gas through a tiny office into an evacuated chamber. 
Therefore;, R1/R2= √mm2/√mm1
The molecular mass of fluorine is 38 g and that of 160 g
    Therefore; = √ (160/38)
                      = √ 4.211
                      = 2.051 
Hence; the rate of effusion of molecular fluorine is 2.051 times than that of molecular bromine at the same temperature and pressure.

Answer: The rate of diffusion of fluorine is 2.05 times to that of bromine.

Explanation:

To calculate the rate of effusion of gas, we use Graham's Law.

This law states that the rate of effusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

[tex]\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}[/tex]

Molar mass of bromine =  160 g/mol

Molar mass of fluorine = 38 g/mol

For the rate of effusion of bromine to fluorine  we write the expression:

[tex]\frac{Rate_{F_2}}{Rate_{Br_2}}=\sqrt{\frac{M_{Br_2}}{M_{F_2}}}[/tex]

[tex]\frac{Rate_{F_2}}{Rate_{Br_2}}=\sqrt{\frac{160}{38}}=2.05[/tex]

Hence, the rate of diffusion of fluorine is 2.05 times to that of bromine.

Which of the following is NOT an assumption of the kinetic theory of gases?
A)Gas particles are in constant random motion.
B)The volume of individual gas particles is zero.
C)The particles in a gas are attracted to each other.
D)Gas particles collide without losing energy.

Answers

Which of the following is NOT an assumption of the kinetic theory of gases?
B)The volume of individual gas particles is zero.
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c) The particles in a gas are attracted to each other

Describe how to make 1.50 liters of a 0.01 M ammonium chloride solution

Answers

Hello!

To know how many grams of Ammonium Chloride ( a solid) you'll need to make 1.50 L of a 0,01 M solution you'll need to use the definition of molar concentration (M=mol/L) in the following way:

[tex]1,50 L* \frac{0,01 mol NH_4Cl}{1L}* \frac{53,489gNH_4Cl}{1 mol NH_4Cl}=0,8023 g NH_4Cl [/tex]

So, you'll need to dissolve 0,8023 g of Ammonium Chloride in 1,5 L of water to make this solution.

Have a nice day!

What is the ph of a buffer that is 0.6 m hf and 0.2 m naf ? the k a of hf is 6.8 × 10 −4 ?

Answers

Answer is: pH value for the buffer solution is 2,69.
c(HF) = 0,6 M.
c(NaF) = 0,2 M.
Ka(HF) = 6,8·10⁻⁴.

Henderson–Hasselbalch equation: pH = pKa + log(c(NaF)/c(HF)).

pH = -log(6,8·10⁻⁴) + log (0,2 M/0,6 M).

pH = 3,17 - 0,48.

pH = 2,69.


Answer:

pH of buffer is 2.69

Explanation:

According to Henderson-Hasselbalch equation for a buffer consists of an weak acid (HF) and it's conjugate base ([tex]F^{-}[/tex])-

[tex]pH=pK_{a}(HF)+log(\frac{C_{F^{-}}}{C_{HF}})[/tex]

Where C stands for concentration

[tex]pK_{a}=-log(K_{a})[/tex]

[tex]C_{F^{-}}[/tex] in 0.2 m NaF is 0.2 m

[tex]C_{HF}=0.6m[/tex]

So, [tex]pH=-log(6.8\times 10^{-4})+log(\frac{0.2}{0.6})=2.69[/tex]

what determines how many items make up a particular unit

Answers

The Avogadro's number determines how many items make up a particular unit, such that 1 mole of a substance contains 6.022 × 10^23 items.
These items may be particles such as molecules, atoms, ions , etc
Therefore, 1 mole of anything has 6.022×10^23 items.
This number is called the Avogadro's constant and applies to all substances, and is normally used by researchers and scientists to determine the number of moles of elements and compounds.

The Avogadro's number is what determines the number of items that

make up  a particular unit.

It is a proportionality factor which was named after the Italian scientist known as Amedeo Avogadro.

The Avogadro's number helps to determine the number of items in an

atom, molecule or ion.

Avogadro's number = 1 mole of a substance containing 6.022 × 10²³ items.

Avogadro's number depends on the nature of the substance and the

character of the reaction if present.

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1.
Which best describes the shape of myoglobin, which in many ways is a typical protein?

a complex three-dimensional shape formed from many twisted helixes

a cylindrical shape that forms from a single twisted helix

a straight chain, like beads on a straight piece of string

a highly-branched chain, much like the branches of a maple tree

Answers

Myoglobin, like most proteins, has a complex three dimensional structure that is formed from many twisted helices. There are more than one helix, and it does not look like beads on a straight piece of string. It is not branched.

How many liters of fluorine gas, at 298 K and 0.98 atm, will react with 23.5 grams of potassium metal? Show all of the work used to solve this problem. 2K + F2 2KF

Answers

For the reaction 2 K + F2 --> 2 KF,
consider K atomic wt. = 39
23.5 g of K = 0.603 moles, hence following the molar ratio of the balanced equation, 0.603 moles of potassium will use 0.3015 moles of F2. (number of moles, n = 0.3015)

Now, following the ideal gas equation, PV = nRT
P = 0.98 atm
V = unknown
n = 0.3015 moles
R = 82.057 cm^3 atm K^-1mole^-1 (unit of R chosen to match the units of other parameters; see the reference below)
T = 298 K
Solving for V,
V = (nRT)/P = (0.3015 mol * 82.057 cm^3 atm K^-1 mol^-1 * 298 K)/(0.98 atm)
solve it to get 7517.6 cm^3 as the volume of F2 = 7.5176 liters of F2 gas is needed.

How many grams of sodium chloride are present in a 0.75 M solution with a volume of 500.0 milliliters? 0.38 grams 22 grams 0.75 grams 44 grams

Answers

I believe the answer is 0.38 grams. 

What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?

Answers

Answer is: the percent by mass of NaHCO₃ is 2,43%.
m(NaHCO₃) = 10 g.
V(H₂O) = 400 ml.
d(H₂O) = 1 g/ml.
m(H₂O) = V(H₂O) · d(H₂O).
m(H₂O) = 400 ml · 1 g/ml.
m(H₂O) = 400 g.
m(solution) = m(H₂O) + m(NaHCO₃).
m(solution) = 400 g + 10 g.
m(solution) = 410 g.
ω(NaHCO₃) = 10 g ÷ 410 g · 100%.
ω(NaHCO₃) = 2,43 %

1. A 10 g gold coin is heated from 25°C to 50°C (CAu is 0.13 J/g-°C). What is the H?
(Points : 1)
+32.5 J

25 J

+25 J

- 32.5 J

I know it is 32.5 J but is it negative or positive... I say it is negative, but I could be wrong...,

Answers

The correct answer is + 32.5 J because heat is absorbed here by copper not evolved also after calculation we will find the H value is positive, lets calculate it:
H = m C Δt where:
m = 10 g 
C = 0.13 J/g.°C
Δ t = final temperature - initial temperature = 50 - 25 = + 25 °C
so H = 10 x 0.13 x (+25) = + 32.5 J
 

Answer:

+32.5  J

Explanation:

If 507 g FeCl2 were used up in the reaction FeCl2 + 2NaOH Fe(OH)2(s) + 2NaCl, how many grams of NaCl would be made?
A. 467.52 g NaCl
B. 1014 g NaCl
C. 233.76 g NaCl
D. 649.05 g NaCl,

Answers

Number of moles of FeCl2 used = mass/ molar mass 
Number of moles = 507/126.751 = 4.
If one mole of Fe reacts with two moles of sodium 
Then 4 moles of Fe produces 8 moles of sodium.
Number of moles of sodium = mass/molar mass
Molar mass of sodium chloride = 23 +35.5 = 58.5 g/mol
Hence mass = 8 * 58.5 = 468 g. Hence Option A.

Mole measure the number of elementary entities of a given substance that are present in a given sample. The correct option is option A that is 467.52 g of NaCl.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

Number of moles of FeCl[tex]_2[/tex] used = mass/ molar mass

Number of moles = 507/126.751 = 4.

If one mole of Fe reacts with two moles of sodium

Then 4 moles of Fe produces 8 moles of sodium.

Number of moles of sodium = mass/molar mass

Molar mass of sodium chloride = 23 +35.5 = 58.5 g/mol

Hence mass = 8 × 58.5 = 468 g.

Therefore, the correct option is option A.

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What is the maximum amount of kcl that can dissolve in 200 g of water? (the solubility of kcl is 34 g / 100 g h 2o at 20°c.) 6800 g 34 g 68 g 17 g?

Answers

the answer is 68 g
hope this helps!!

If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions?
2 CO (g) + O2 (g) ---> 2 CO2 (g)

a. 1.5 L
b. 3.0 L
c. 4.5 L
d. 6.0 L,

Answers

At STP, the volume of a gas represents the number of particles.That said, from the chemical reaction one mole of oxygen reacts with two moles of co to produce the product, CO2At STP, 3 moles of Oxygen will produce 6 moles of CO2. Hence It follows that at standard temperature and pressure, 6.0 L of CO2 will be produced. Option D.

What is the [H+] of a solution with a pH of 6.6? Use a scientific calculator.

2.5 × 107

5.0 × 105

8.3 × 106

7.7 × 105

Answers

pH is a logarithmic scale as seen below:

   pH = -log([H+])

   Please note the negative sign in front of the log function. As concentration of H+ ions increases, the pH will decrease. If pH = 6.6, then:

   pH = 6.6 = -log([H+])

   You can multiple both sides by -1. Then, to get rid of the log function, set both sides of the equation equal to 10^ as shown below:

   10^(-6.6) = [H+]

   10^(-6.6) = 2.511x10^-7,

Considering the definition of pH, the concentration [H⁺] is 2.5 ×10⁻⁷ M.

Definition of pH

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

Concentration [H⁺] of the solution

In this case, being pH= 6.6, you can replace this value in the definition of pH:

6.6 = -log [H⁺]

Solving:

[H⁺]= 10⁻⁶ ⁶ M

[H⁺]= 2.5 ×10⁻⁷ M

Finally, the concentration [H⁺] is 2.5 ×10⁻⁷ M.

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Which physical state of nitrogen has the highest entropy? (1 point) solid liquid gas vapor?

Answers

Answer is. gas has the highest entropy.
Entropy is the measure of the molecular disorder and it is system’s thermal energy per unit temperature that is unavailable for doing useful work. 
Nitrogen molecules have weakest intermolecular bonds in gas phase and move fast and without order. In solid state movement is much more less.


EASY AND IMPORTANT What do you think is the most challenging aspect of using a microscope? What are the advantages and disadvantages of using a microscope to look at trace evidence?

Answers

The most challenging aspect is focusing the microscope.

Microscopes enables us to view objects that cannot be seen with the human eye alone.

A disadvantage is that not all types of evidence can be clearly seen.

What is a microscope?

A microscope is an instrument that is used to view tiny and microscopic objects.

In using a microscope, the most challenging aspect is focusing the microscope.

An advantage of microscopes is that they enable us to view objects that cannot be seen with the human eye alone.

A disadvantage though is that not all evidence can be clearly seen.

In conclusion, a microscope helps one to view trace and tiny objects.

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explain in terms of collision theory, how and why a reactions's rate changes as the reaction progresses

Answers

The rate of a chemical reaction is the speed with which the reactants are converted to products while the collision theory is used to explain why chemical reactions occur at different rates. It states that for a reaction to proceed, the reactants particles must collide and the more successful collisions there are per unit of time, the faster the reaction will be. As the reaction progresses, the products builds up in the system and the chance that the reactants will collide amongst themselves reduces as the product molecules begin to build up while the molecules of the reactants are deprived. therefore the rate of reaction changes.

Explanation:

According to collision theory, more is the number of collisions occurring between the combining substances more will be the rate of reaction.

Factors that affect rate of a reaction are as follows.

Temperature - Increase in temperature leads to increase in kinetic energy of particles due to which there occurs more number of collisions between them. As a result, rate of reaction will increase leading to increase in rapid formation of products.

Surface area - More is the surface area of a substance, less will be the interaction between solute and solvent particles. And, when there occurs decrease in surface area then interaction between solute and solvent particles increases. This leads to increase in rate of reaction.

Concentration of reactants - More is the concentration of reactant molecules more is the availability of molecule interaction. As a result, more number of collisions occur leading to increase in rate of a reaction.

What salt is produced in each of the following neutralization reactions?
HNO3(aq)+KOH(aq)→H2O(l)+?
HNO3(aq)+Ca(OH)2(aq)→H2O(l)+?
HCl(aq)+Ca(OH)2(aq)→H2O(l)+?
HCl(aq)+KOH(aq)→H2O(l)+?
Drag the appropriate items to their respective bins.,

Answers

The salts produced are:

1. KNO₃

2. Ca (NO₃)₂

3. CaCl₂

4. KCl

Further explanation

The neutralization reaction is one acid-base reaction. It is said neutralization because the reaction results obtained H₂O water which is neutral

In this reaction obtained salt which is dependent on the acid and the bases. Salt that occurs is produced from cations of bases and anions of acids

There are 4 types of neutralization or salt formation reactions that may occur, namely:

1. strong acids and bases2. Weak acids and strong bases3. strong acids and weak bases4. Weak acids and weak bases

In the reaction above we use the principle that already exists, that is the salt formed comes from base cations and acid anions

 

1.HNO₃ (aq) + KOH (aq) → H₂O (l) + KNO₃ (aq), the salt is: KNO₃

2.2HNO₃ (aq) + Ca (OH)₂ (aq) → 2H₂O (l) + Ca(NO₃)₂ (aq),the salt is: Ca(NO₃)₂

2HCl (aq) + Ca(OH)₂ (aq) → 2H₂O (l) + CaCl₂ (aq),the salt is:CaCl₂

HCl (aq) + KOH (aq) → H₂O (l) + KCl (aq),the salt is KCl

 

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Keywords: acid, base, salt, water, neutralization reaction

 

The salt produced in each of the following neutralization reactions:

HNO₃(aq) + KOH(aq) → H₂O(l) + KNO₃(aq)

HNO₃(aq) + Ca(OH)₂(aq) → H₂O(l) + Ca(NO₃)₂(aq)

HCl(aq) + Ca(OH)₂(aq) → H₂O(l) + CaCl₂(aq)

HCl(aq) + KOH(aq) → H₂O(l) + KCl(aq)

In each of these neutralization reactions, an acid reacts with a base to produce water and a salt. The general formula for a neutralization reaction is:

Acid + Base → Water + Salt

In the first reaction, nitric acid (HNO₃) reacts with potassium hydroxide (KOH) to produce water (H₂O) and potassium nitrate (KNO₃) as the salt.

In the second reaction, nitric acid (HNO₃) reacts with calcium hydroxide (Ca(OH)₂) to produce water (H₂O) and calcium nitrate (Ca(NO₃)₂) as the salt.

In the third reaction, hydrochloric acid (HCl) reacts with calcium hydroxide (Ca(OH)₂) to produce water (H₂O) and calcium chloride (CaCl₂) as the salt.

In the fourth reaction, hydrochloric acid (HCl) reacts with potassium hydroxide (KOH) to produce water (H₂O) and potassium chloride (KCl) as the salt.

In all of these reactions, water is formed as a product, and the specific salt formed depends on the combination of the acid and base used in the reaction. The type of salt formed is determined by the anions (negatively charged ions) from the acid and the cations (positively charged ions) from the base.

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4130 J of energy 52g water 10 c initial specific heat 4.18 J waht would the final temperature be

Answers

Heat energy = mass × specific heat capacity × change in temperature.
Heat energy = 4130 J, specific heat capacity of water = 4.18 J/g/C, the mass of water = 52 g, if final temperature is T
4130 = 52 × 4.18 ×(T-10)
4130 = 217.36 T - 2173.6
217.36 T = 6303.6
    T = 29
Therefore the final temperature is 29 °C

Consider the balanced equation below.


What is the mole ratio of Fe3O4 to Fe?

1:3
1:4
3:1
4:3

Answers

Is the equation correctly balanced? Yes it is. 

The mol ratio is the number in front of one chemical to the other.

There is a 3 in front of the Fe.
There is a 1 in front of the Fe3O4

Edit
What the original answer gave was the mole ratio of Fe to Fe3O4. It is actually the other way around. The answer should be 1:3 because it was asked as Fe3O4 to Fe.
The correct answer is A <<<<<<<< Correct Answer.

Answer:

1:3

Explanation:

Hope this helps :)

A gas occupies 50.0 ml at standard temperature and pressure. if the volume of gas increases to 120ml, what is the new pressure

Answers

ok so, P1V1 = P2V2  this is..  (1atm)(50 ml) = (x atm)(120 ml)

Algebraically the answer should be 0.416 atm. which does make sense b/c in volume is increasing, vapor pressure is lowering.
Final answer:

Using Boyle's Law, which states that pressure and volume are inversely proportional under constant temperature and moles of gas, the new pressure is calculated when a gas at STP (1 atm) with a volume of 50.0 ml is expanded to 120 ml. The new pressure is found to be approximately 0.417 atm.

Explanation:

The question is asking about the behavior of a gas under different pressures, while the temperature and the quantity of the gas remain constant. According to Boyle's Law, pressure and volume are inversely proportional when temperature and the number of moles of a gas are held constant. This means that if the volume of a gas increases, the pressure will decrease, and vice versa, as long as the temperature and moles of gas do not change. In the given scenario, a gas originally occupies 50.0 ml at standard temperature and pressure (STP). If the volume of the gas is increased to 120ml, we use Boyle's Law to calculate the new pressure:

P1 * V1 = P2 * V2

P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume. At STP, P1 is 1 atm and V1 is 50.0 ml. The final volume V2 is 120ml. The new pressure P2 can be calculated as follows:

P2 = (P1 * V1) / V2
  = (1 atm * 50.0 ml) / 120 ml
  = 50.0 atm·ml / 120 ml
  = 0.417 atm

Therefore, the new pressure of the gas when the volume increases to 120ml is approximately 0.417 atm.

WILL RECIEVE MEDAL!If 1.2 kilograms of rust form on a bridge in five days, what should be the rate of reaction in grams per hour? (Recall that a bar over the number means that zero is significant.)



100(first zero has bar over it) g/hr
0.05 g/hr
0.010 g/hr
10(zero has bar over it) g/hr,

Answers

Since the answer is in grams, kilograms must first be converted to grams. A kilogram is equivalent to 1000 grams. Therefore, multiply 1.2 kilograms by 1000 and you get 1,200 grams. Then, calculate the number of hours in 5 days. Each day is 24 hours and 24 hours multiplied by 5 days equals 120 hours. Lastly, since the answer is in grams per hour, divide 1,200 grams by 120 hours and the resultant rate of reaction is 10 g/hr.

An increase in temperature can disturb the liquid-vapor equilibrium
True
False

Answers

The answer is True.

when the temperature changes, it affects the equilibrium constant and that makes the equilibrium change. 
because when the temperature changes that make the vapor pressure changes and make the equilibrium shifts.

Sucrose is another name for table sugar. Sucrose is a compound made from the elements carbon, hydrogen, and oxygen. Which statement best describes the properties of sucrose?

Answers

Final answer:

Sucrose is a disaccharide compound of glucose and fructose and forms a homogeneous solution when dissolved in water. The physical and chemical properties of sucrose are quite different from its constituent elements in their individual states.

Explanation:

Sucrose, also known as table sugar, is a compound made of the elements carbon, hydrogen, and oxygen. Structurally, it's a disaccharide, meaning it consists of two sugar units; in this case glucose and fructose. Sucrose has covalent bonds and is a crystalline solid at room temperature. When dissolved in water, it forms a homogeneous solution where its molecules are uniformly distributed among the water molecules. These are some of the key properties of sucrose.

It's important to note that the properties of the sucrose molecule vastly differ from the properties of its constituent elements when in their free, or uncombined, state. Carbon, for instance, is a black solid and hydrogen and oxygen are colorless gases when uncombined, but when they chemically combine, they form the white, crystalline solid that is sucrose.

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Why is a skeptical attitude important in science ? please help me.

Answers

It allows scientists to challenge inaccurate information.

Answer: It allows scientists to challenge inaccurate information.

Explanation:

Skeptical attitude is important for science because it creates doubts which is necessary for new findings in research. A doubt may possibly result in curiosity to know about the validity of previous research and findings. As the result of this the scientists will perform the same research again.

What happens to an atom of fluorine (f) when it forms an ionic bond in which it has the same electron configuration as the noble gas neon?

Answers

It will gain one electron and become negatively charged

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, one electron will be gained by fluorine during the reaction.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. When  an atom of fluorine (f) when it forms an ionic bond in which it has the same electron configuration as the noble gas neon, one electron will be gained by fluorine to form negative charge anion.

Therefore, one electron will be gained by fluorine during the reaction.

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I am studying for ACS and have trouble understanding how to rank molecules in decreasing or increasing solubility in water...

I know the rules of which molecules are insoluable...But how do you rank them in which is least or most soluble.

The question in the acs included
In which set are the substances arranged in order of decreasing solubility in water?

(A) Al(OH)3 > Mg(OH)2 > NaOH

(B) BaSO4 > CaSO4 > MgSO4

(C) CaCO3 > NaHCO3 > Na2CO3

(D) AgCl > AgBr > AgI

Answers

The set AgCl > AgBr > AgI are arranged in order of decreasing solubility in water. In order to get the solubility, it is measured in grams per 100 g of solvent – g/100 g – or number of moles per 1 L of the solution.

How many grams of water are needed to react with 15.0 grams of li2o? given: li2o+h2o→2lioh?

Answers

Answer is: 9 grams of water are needed to react.
Chemical reaction: Li₂O + H₂O → 2LiOH.
m(Li₂O) = 15 g.
n(Li₂O) = m(Li₂O) ÷ M(Li₂O).
n(Li₂O) = 15 g ÷ 30 g/mol.
n(Li₂O) = 0,5 mol.
From chemical reaction: n(Li₂O) : n(H₂O) = 1 : 1.
n(H₂O) = 0,5 mol.
m(H₂O) = 0,5 mol · 18 g/mol.
m(H₂O) = 9 g.

Answer:

9.04 g of [tex]H_{2}O[/tex] are needed to react

Explanation:

According to balanced equation, 1 mol of [tex]H_{2}O[/tex] reacts with 1 mol of [tex]Li_{2}O[/tex]

Molar mass of [tex]Li_{2}O[/tex] = 29.9 g/mol

Number of moles = (mass)/(molar mass)

So, 15.0 g of [tex]Li_{2}O[/tex] = [tex]\frac{15.0}{29.9}[/tex] moles of [tex]Li_{2}O[/tex]

So, moles of [tex]H_{2}O[/tex] are needed to react = [tex]\frac{15.0}{29.9}[/tex] moles

Molar mass of  [tex]H_{2}O[/tex] = 18.02 g/mol

So, mass of [tex]H_{2}O[/tex] are needed to react = [tex]\frac{15.0}{29.9}\times 18.02g=9.04g[/tex]

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