Answer: 750ml
Explanation:
Using charle's law
V1/T1=V2/T2
V1= 500ml
T1= -73⁰C
V2= ?
T2=27⁰C
We can see that the temperature is in Celsius
Now,we will convert to Kelvin
Kelvin= 273+ Celsius
So convert the Celsius value to Kelvin
For T1= 273+(-73)
T1= 273-73
T1= 200K
For T2= 273+27
T2= 300K
V1/T1=V2/T2
500/200=V2/300
Cross multiply
200×V2=500×300
200V2= 150000
V2= 150000/200
V2= 750ml
So,
750ml of gas will occupy at 27⁰C
Answer:
750mL
Explanation:
Charles law states that the volume of a fixed mass of gas is inversely proportional to its temperature, at constant pressure
Mathematically,
V1/T1 = V2/T2
Values given are;
V1=initial volume of the gas=500mL
T1=initial temperature of the gas=-73.0°C=(-73.0+273)K=200K
V2=final volume of gas
T2=final temperature of gas=27.0°C=(27.0+273)K=300K
The volume of the gas at 27°C is unknown.
We'll make V2 subject of the formula
V1/T1=V2/T2
V2=(V1×T2)/T1
V2=(500×300)/200
V2=750mL
Therefore, the gas will occupy a volume of 750mL at 27.0°C
a gas is at a pressure of 12.5psi and a volume of 750mL. What volume will the gas occupy at a pressure of 18psi?
Answer:
520.8 mL
Explanation:
We can solve this problem by using Boyle's Law, which states that:
"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"
Mathematically:
[tex]p\propto \frac{1}{V}[/tex]
where
p is the pressure
V is the volume
We can rewrite the equation as
[tex]p_1 V_1 = p_2 V_2[/tex]
where here:
[tex]p_1=12.5 psi[/tex] is the initial pressure of the gas
[tex]V_1=750 mL[/tex] is the initial volume
[tex]p_2=18 psi[/tex] is the final pressure
And solving for V2, we find the final volume of the gas:
[tex]V_2=\frac{p_1 V_1}{p_2}=\frac{(12.5)(750)}{18}=520.8 mL[/tex]
Consider the following three-step reaction pathway.
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast)
Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow)
Step 3: (CH3)Au + PH3 – (CH3)AuPH3 (fast)
Which is the correct list of reaction intermediates from the reaction pathway above?
A.) (CH3)3AuPH3, (CH3)3Au, and (CH3)Au
B.) PH3 and (CH3)Au
C.) (CH3)3AUPH3 and C2H6
D.) PH3, (CH3)3Au, and (CH3)Au
Final answer:
The correct list of reaction intermediates is A)(CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
Explanation:
The correct list of reaction intermediates from the given reaction pathway is:
A)(CH3)3AuPH3
,
(CH3)3Au
, and
(CH3)Au
This can be determined by examining the steps of the reaction pathway. In step 1, (CH3)3AUPH3 is converted into (CH3)3Au and PH3. In step 2, (CH3)3Au reacts to form (CH3)Au and C2H6. Finally, in step 3, (CH3)Au reacts with PH3 to form (CH3)AuPH3. Therefore, the intermediates are (CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
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In the provided chemical reaction pathway, the intermediates are (CH3)3Au and (CH3)Au as they are produced in a step and consumed in a later step. This makes option D correct.
Explanation:In a chemical reaction, intermediates are substances that form during the reaction but are consumed before it's completed. Here, judging from the three-step reaction pathway you've been provided:
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast) Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow) Step 3: (CH3)Au + PH3 → (CH3)AuPH3 (fast)
The intermediates can be identified as the molecules that are produced in one step and consumed in a later step. Based on this, the correct list of reaction intermediates from this reaction pathway is (CH3)3Au, because it is produced in step 1 and consumed in step 2 and (CH3)Au, because it is produced in step 2 and consumed in step 3. So, option D.) PH3, (CH3)3Au, and (CH3)Au is correct.
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The volume of any gas is dependent on what three variables? *
The volume of a gas is dependent on:
1. Pressure
2. Temperature
3. Amount of gas.
Increasing the mass of an object will... *
Answer:
Increasing the mass of an object will decrease the acceleration, because of Newton's Second Law (the acceleration of an object increases with increased force, decreases with increased mass, and moves the same direction as the force).
How many joules (J) are needed to increase the temperature of 10.0 g of lead (Pb) from 30 ˚C to 50 ˚C? (Cp for Pb = 0.128 J/g˚C)
25.6 J
38.4 J
64.0 J
102.4 J
Answer:
Q = 25.6 j
Explanation:
Given data:
Energy needed= ?
Mass of lead = 10.0 g
Initial temperature = 30 °C
Final temperature = 50°C
Cp = 0.128 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 30°C
ΔT = 20°C
Now we will put the values in formula.
Q = 10 g × 0.128 j/g.°C × 20°C
Q = 25.6 j
Select all the correct images.
Select the atomic models that belong to the same element.
.
Answer:
There is no image
Explanation:
Which statement is true?
In an exothermic reaction, the energy of the products is the same as the energy of the reactants.
In an endothermic reaction, the energy of the products is less than the energy of the reactants.
In an exothermic reaction, the energy of the products is less than the energy of the reactants.
In an endothermic reaction, the energy of the products is the same as the energy of the reactants.
Answer:
C
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Answer:
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
An atom is said to be in an excited state when it possesses more energy than when it is in its
ground state.
True or false?
Answer:
True!
Explanation:
Now molecules: molecules of H2 + molecules of O2 → molecules of H2O
Answer:
Now molecules:
(2) molecules of H 2 + (1) molecules of O 2 → (2) molecules of H 2 O
Explanation:
i just got the answer correct
The question involves a basic chemical reaction in Chemistry. Two molecules of hydrogen and one molecule of oxygen combine to form two molecules of water. It shows the process of a balanced chemical equation.
Explanation:The question provided involves a basic chemical reaction, in which hydrogen (H2) and oxygen (O2) molecules combine to create water (H2O). This process is an example of a balanced chemical reaction, in accordance with the law of conservation of matter that requires the total number of atoms for each element to remain the same before and after a reaction. Essentially, 2 molecules of hydrogen (H2) and 1 molecule of oxygen (O2) will combine to form 2 molecules of water (H2O)
This can be represented as: 2H2 + O2 → 2H2O. This means, two hydrogen molecules (each containing 2 hydrogen atoms) react with one molecule of oxygen (containing 2 oxygen atoms) to form two molecules of water (each containing 2 hydrogen atoms and 1 oxygen atom).
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At dinner your brother got mad and threw your burrito at a speed of 4 m/s. It flies for 18 seconds trough the air. How much distance did the burrito cover?
Answer:
Distance = 72 meters.
Explanation:
Given data:
speed of burrito = 4 meter/ second
Time taken in flight = 18 seconds.
Required: The distance covered during this time and having the above speed by the burrito.
Solution :
Formula of speed is given below.
Speed = distance / time interval
By putting the values of speed and time, we get,
4 meter / second = distance / 18 seconds.
Multiply 18 both, we get
4 x 18 = distance
Distance = 72 meters.
What is the mass of 1.72 moles of BaSO4?
Answer: 401.4g
Explanation:
The mass can be calculated by using the following mathematical expression for Moles ,which is:
Moles = Mass / Molar Mass
From the question given, Moles = 1.72, Molar mass of BaSO4 = 233.38g/mol, Mass =?
Making 'Mass' the subject of formula, we get:
Mass = Molar mass x Moles
= 233.38 x 1.72 = 401.4g
What volume would 4.3 moles of hydrogen gas occupy at 45° C and 3.22 atm?
Answer:
34.8 L of hydrogen gas
Explanation:
Now we have to use the ideal gas equation;
PV= nRT
P= pressure of the gas= 3.22atm
V= volume of the gas = ?????
T= temperature of the gas = 45°C +273= 318K
n= number of moles =4.3 moles
R= universal gas constant= 0.082atm Lmol-1K-1
Making V the subject of the formula
V= nRT/P
V= 4.3×0.082×318/3.22
V= 34.8 L
Answer:
34.82 L
Explanation:
Step 1:
Data obtained from the question:
Number of mole (n) = 4.3 mole
Temperature (T) = 45°C = 45°C +273 = 318K
Pressure (P) = 3.22 atm
Volume (V) =?
Step 2:
Determination of the volume hydrogen gas.
With the application of the ideal gas equation, the volume of Hydrogen gas can be obtained as follow:
Note that the gas constant (R) = 0.082atm.L/Kmol
PV = nRT
3.22 x V = 4.3 x 0.082 x 318
Divide both side by 3.22
V = (4.3 x 0.082 x 318) /3.22
V = 34.82 L
Therefore the volume occupied by the hydrogen gas is 34.82 L
At 60 Celsius , 123 grams of NaNO3 is dissolved in 100 grams of water. What is the Molarity of this solution?
Answer:
CHAPTER 17
PROPERTIES OF SOLUTIONS
Solution Composition
12. Mass percent: the percent by mass of the solute in the solution.
Mole fraction: the ratio of the number of moles of a given component to the total number of
moles of solution.
Molarity: the number of moles of solute per liter of solution.
Molality: the number of moles of solute per kilogram of solvent.
Volume is temperature-dependent, whereas mass and the number of moles are not. Only
molarity has a volume term, so only molarity is temperature-dependent.
13. a. HNO3(l) → H+
(aq) + NO3
−
(aq) b. Na2SO4(s) → 2 Na+
(aq) + SO4
2−
(aq)
c. Al(NO3)3(s) → Al3+(aq) + 3 NO3
−
(aq) d. SrBr2(s) → Sr2+(aq) + 2 Br−
(aq)
e. KClO4(s) → K+
(aq) + ClO4
−
(aq) f. NH4Br(s) → NH4
+
(aq) + Br−
(aq)
g. NH4NO3(s) → NH4
+
(aq) + NO3
−
(aq) h. CuSO4(s) → Cu2+(aq) + SO4
2−
(aq)
i. NaOH(s) → Na+
(aq) + OH−
(aq)
14. Mol Na2CO3 = 0.0700 L ×
L
3.0 mol Na 2CO3 = 0.21 mol Na2CO3
Na2CO3(s) → 2 Na+
(aq) + CO3
2−
(aq); mol Na+
= 2(0.21) = 0.42 mol
Mol NaHCO3 = 0.0300 L ×
L
1.0 mol NaHCO3 = 0.030 mol NaHCO3
NaHCO3(s) → Na+
(aq) + HCO3
−
Helppppppppppp please
Answer:
1. Option(1) 3
2. Option (2) 1/2
Explanation:
1. We'll begin by obtaining the molar mass of H3PO4. This is illustrated below:
Molar Mass of H3PO4 = (3x1) + 31 + (16x4) = 3 + 31 + 64 = 98g/mol
Mass of H in H3PO4 = 3x1 = 3g
The percentage by mass of H in H3PO4 given by:
Mass of H in H3PO4/Molar Mass of H3PO4 x 100
=> 3/98 x 100
=> 3
2. Atoms present in H3PO4 are given below:
H = 3 atoms
P = 1 atom
O = 4 atoms
Total = 8 atoms
The fraction of oxygen atom in H3PO4 is given by:
=> Atom of O/total atoms
=> 4/8
=> 1/2
A magnet moved near a coil of wire can cause a(n)
to flow.
A. electric current
B.protons
c. magnetic field
D.neutrons
Answer:
A magnet moved near a coil of wire can cause a(n) electric current to flow. (The magnet's magnetic field also moves.)
Explanation:
The answer is A.
DNA damage can also occur in the form of broken bonds as in the sugar-phosphate backbone of DNA. This type of DNA damage can cause deletion mutations if pieces of DNA break away from the molecule. When those pieces rejoin a different molecule of DNA, what type of mutation has occurred?
A)Messenger Mutation
B)Mechanical Mutation
C)Translocation Mutation
D)Relocation Mutation
Answer:
A
Explanation:
What is the volume, to the nearest whole cubic inch, of a cylinder with a height of 10 inches and a radius of 8 inches? Use Pi = 3.14 and round your answer to the whole number.
cubic inches
Answer:
v=2010 inches^3
Explanation:
The volume of a cylinder can be found using:
[tex]v=\pi r^2h[/tex]
We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi
v=3.14(8^2)(10)
Solve the exponent first
v=3.14(64)(10)
v=3.14(640)
v=2009.6
To the nearest whole number:
v=2010 inches^3
What is the pOH of the solution?
The pOH of the solution is 8.
What is pOH?
pOH is a measure of the hydroxide ion concentration in a solution, reflecting its alkalinity. It is calculated as the negative logarithm of the hydroxide ion concentration. The pOH scale complements the pH scale, which measures the hydrogen ion concentration, and together they provide a comprehensive view of a solution's acid-base balance.
We know that;
pOH = - log[OH-]
pOH = -log[9.5 *[tex]10^{-9[/tex]]
pOH = 8
A student conducting a calorimetry investigation determines a negative ∆H. What does the negative value indicate about the reaction?
Answer : The negative value indicate about the reaction is exothermic and heat is released.
Explanation :
Enthalpy of a reaction (ΔH): It is defined as the energy change that takes place during the chemical processes. It is represented as, ΔH.
If the heat is absorbed during the chemical process then the enthalpy of reaction is positive.
If the heat is released during the chemical process then the enthalpy of reaction is negative.
That means,
When the value of enthalpy of reaction is negative then the heat is released and the reaction will be exothermic reaction.
When the value of enthalpy of reaction is positive then the heat is absorbed and the reaction will be endothermic reaction.
Final answer:
A negative ∆H in calorimetry signifies an exothermic reaction where heat is released by the system to the surroundings.
Explanation:
A negative ∆H in a calorimetry investigation indicates that the reaction is exothermic, meaning heat is released by the system to the surroundings.
For example, if the enthalpy change is negative in the combustion of methane, it signifies that heat is being given off by the system.
In calorimetry, negative ∆H values represent energy being transferred from the system to its surroundings in exothermic reactions.
5. Which of the following identifies an element?|
a. proton
C. electron
b. neutron
d. antineutrino
a, proton following identifies an element
The number of protons identifies an element. Therefore, option A is correct.
What easily identifies an element?The atomic number is used to identify an element, and it is the number of protons in an element's nuclei. Every element has a distinct number of protons, and thus an atomic number.
Electron configuration, atomic size, ionization energy, electron affinity, and electronegativity are atomic properties that are critical to element behavior.
The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the identity of an element.
The number of protons in an element is the only way to identify it; the number of neutrons and electrons can vary without changing the element's identity.
Thus, The number of protons identifies an element, option A is correct.
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While waiting for your car to warm up one winter morning, you notice a liquid dripping from your tailpipe. You recently
learned in chemistry class that combustion reactions occur in car engines. The liquid dripping from your tailpipe is, therefore,
a product of this combustion.
What is the identity of the liquid?
A)
Methanol
B)
Octane
Propane
Water
Answer:
A
Explanation:
Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.
what type of reaction is sodium reacting with chlorine
Answer:
combination reaction
Explanation:
i'm not sure i just searched it on the internet
Answer:
Combination reaction
Explanation:
When sodium reacts with chlorine
It is known to be combination reaction because they will combine to give a specific compound
That is,Na+Cl=NaCl
And the bond formed between them is ionic bond
how many grams of calcium fluoride contain 38 grams of fluoride atoms
What is [H30+] in a solution with a pH of 10.4?
Answer:
(H30+) = 3,98 x10 ^-11 M
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
We solve (H30+) and calculate:
(H30+) = antilog - pH
(H30+) = antilog - 10.4
(H30+) = 3,98 x10 ^-11 M
What size volumetric flask would you use to create 1.50 M
solution using 43.85 g of NaCl?
The size of volumetric flask is 0.5L = 500mL
Explanation:
In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.
Molarity of a solution is given by;
[tex]M= \frac{n}{V}[/tex]
Where;
n= number of moles of solute
V= volume of solution = size of volumetric flask
[tex]n=\frac{m }{ m.m}[/tex]
Where;
m= mass of solute=43.85g
m.m= molar mass of solute=58.5g
Note that solute is NaCl(s)
[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]
We know that the molarity is 1.50M
To find the size of the volumetric flask, we make V in M=n/V subject of formula
[tex]V=\frac{n}{M}[/tex]
[tex]V=\frac{0.75}{1.50}[/tex]
[tex]V=0.5[/tex]
Therefore, the size of volumetric flask is 0.5L = 500mL.
Final answer:
To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.
Explanation:
To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:
moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles
Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:
1.50 M = 0.750 moles / V (liters)
Solving for V gives us:
V = 0.750 moles / 1.50 M = 0.500 liters
Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.
Which element is represented by a bohr model with one electron
which gas law holds pressure constant ???? HELP
Answer:
Boyle's Law
Explanation:
It's Boyle's law because, for a fixed mass of a perfect gas remaining at a fixed temperature ,pressure and volume are inversely correspondent . Boyle's law is a gas law, that states that pressure and volume of a gas has an inverse relationship . So, if the volume of the gas increases then,the pressure will decrease and vice versa , when temperature is held constant.
10 POINT
I WILL MARK BRANLIEST PLSS HELP
Plants have played a role in affecting the Earth system by:
I. changing the composition of the atmosphere
II. changing the quality of the soil
III. weathering rocks
IV. altering the length of a day
A.
II and IV only
B.
I, II, and III only
C.
III and IV only
D.
I only
Which of the following describes the stage that occurs after evaporation in the water cycle?
A.
precipitation
B.
radiation
C.
condensation
D.
respiration
In the water cycle, the stage following evaporation is condensation. This process involves water transforming from a gas back into a liquid form in the atmosphere, eventually leading to precipitation.
Explanation:In the water cycle, the stage that occurs after evaporation is condensation. After water evaporates from the earth's surface, it rises into the atmosphere where cooling temperatures cause it to change from a gas (steam) back into a liquid form, creating clouds.
This is the process of condensation. It's important to note that the water cycle is a continual process, and after condensation, the cycle usually moves on to precipitation, where the condensed water falls back to the earth as rain, sleet, or snow.
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What type of reactions require energy in order to start?
Answer:
Endergonic reactions
Explanation:
The terms endergonic and exergonic describe reactions in terms of the energy transfer. Because ender = in, exo = out, we can tell that endergonic reactions need energy put in, and exergonic don't need energy put in, they release energy!