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WorksheetsAP Chemistry Review: Unit 7
Total questions: 15
Worksheet time: 15mins
At equilibrium, concentrations of reactants and products are
equal
constant
At what time does the system first reach equilibrium?
24s
40s
60s
80s
H2 gas and N2 gas were placed in a rigid vessel and allowed to reach equilibrium in the presence of a catalyst according to the following equation.
3 H2(g) + N2(g) ⇄ 2 NH3(g) ΔHo = -92 kJ/molrxn
The diagram below shows how the concentrations of H2 , N2 , and NH3 in this system changed over time. What occurs from t1 to t2?
The concentration of N2 decreased.
The number of effective collisions between H2 and N2 was zero.
The rates of the forward and reverse reactions were equal.
The rate of formation of NH3 molecules was equal to the rate of disappearance of H2 molecules.
H2(g)+I2(g)⇄2HI(g)
Hydrogen gas reacts with iodine gas at constant temperature in a sealed rigid container. The gases are allowed to reach equilibrium according to the equation above. Which of the following best describes what will happen to the reaction immediately after additional iodine gas is added to the system?
The rates of both the forward and reverse reactions decrease.
The rates of both the forward and reverse reactions do not change.
The rate of the forward reaction becomes greater than the rate of the reverse reaction.
The rate of the forward reaction becomes less than the rate of the reverse reaction.
H2(g) + I2(g) ⇄ 2HI(g)
A 1.0mol sample of H2(g) and a 1.0mol sample of I2(g) are placed in a previously evacuated 1.0L container and allowed to reach the equilibrium shown above. If the equilibrium concentration of HI(g) is 0.40M, which of the following is the value of the equilibrium constant?
0.16
0.25
0.44
1.0
Given the Kc for a forward reaction, how can you find Kc for the reverse reaction?
Divide Kc by 1
Divide 1 by Kc
Square Kc
Take the square root of Kc
For the reaction...
SO2 + O2 <−> SO3
If the concentration of SO2 is increased, the system will shift ___________.
left
right
left and right
neither left nor right
For the reaction...
heat + N2 + O2 ↔ 2NO
If heat is added to the chemical system, the system will shift _______.
left
right
left and right
neither left nor right
2SO2 (g) + O2 (g) ⇌ 2SO3 (g)
Decreasing the volume of container will
shift the system right
shift the system left
change K
have no effect
Which of the following must be true for a reaction that proceeds spontaneously from initial standard state conditions?
ΔG° > 0 and Keq > 1
ΔG° > 0 and Keq < 1
ΔG° < 0 and Keq > 1
ΔG° < 0 and Keq < 1
When a reaction at equilibrium is reversed,
the K value's sign is flipped
the K value is divided by 2
the K value is the reciprocal of original k
