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- 1. Multiple-choice30 seconds1 pt
Consider the following equilibrium reactions. Choose the letter that corresponds to the equilibrium that best fits the information provided. You may use each letter once, more than once or not at all.
A decrease in temperature at constant pressure shifts the position of this equilibrium from right to left.
P
Q
R
S
T
- 2. Multiple-choice30 seconds1 pt
Consider the following equilibrium reactions. Choose the letter that corresponds to the equilibrium that best fits the information provided. You may use each letter once, more than once or not at all.
This equilibrium uses concentrated phosphoric acid as a catalyst in a hydration reaction.
P
Q
R
S
T
- 3. Multiple-choice30 seconds1 pt
Consider the following equilibrium reactions. Choose the letter that corresponds to the equilibrium that best fits the information provided. You may use each letter once, more than once or not at all.
A decrease in pressure at constant temperature shifts the position of this equilibrium from left to right.
P
Q
R
S
T
- 4. Multiple-choice30 seconds1 pt
Consider the following equilibrium reactions. Choose the letter that corresponds to the equilibrium that best fits the information provided. You may use each letter once, more than once or not at all.
There is no change in the position of this equilibrium when the pressure is increased at constant temperature.
P
Q
R
S
T
- 5. Multiple-choice30 seconds1 pt
Consider the following equilibrium reactions. Choose the letter that corresponds to the equilibrium that best fits the information provided. You may use each letter once, more than once or not at all.
An increase in the concentration of steam at constant temperature and constant pressure shifts the position of this equilibrium from right to left.
P
Q
R
S
T
- 6. Multiple-choice30 seconds1 pt
The Maxwell–Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature is shown.
Which letter represents the mean energy of the molecules?
A
B
C
D
- 7. Multiple-choice30 seconds1 pt
The diagram shows the Maxwell−Boltzmann distribution of molecular energies in a gas at two different temperatures.
Which letter represents the most probable energy of the molecules at the higher temperature?
A
B
C
D
- 8. Multiple-choice30 seconds1 pt
The question below is about the Maxwell–Boltzmann distribution shown for a sample of a gas, X, at two different temperatures.
Which letter shows the mean energy of the molecules at the higher temperature?
P
Q
R
S
- 9. Multiple-choice30 seconds1 pt
The question below is about the Maxwell–Boltzmann distribution shown for a sample of a gas, X, at two different temperatures.
Which statement is correct for the higher temperature?
The area under the curve to the left of Ea decreases.
The total area under the curve increases.
The activation energy decreases.
More molecules have the mean energy.
- 10. Multiple-choice30 seconds1 pt
This question is about the Maxwell–Boltzmann distribution of molecular energies in a sample of a gas shown in the figure below.
Which letter best represents the mean energy of the molecules?
A
B
C
D
- 11. Multiple-choice30 seconds1 pt
This question is about the Maxwell–Boltzmann distribution of molecular energies in a sample of a gas shown in the figure below.
What does the area under the curve represent?
The total energy of the particles.
The total number of particles.
The number of particles that can react with each other.
The total number of particles that have activation energy.
- 12. Multiple-choice30 seconds1 pt
The graph below shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.
Which of the following statements is true?
Position A represents the mean energy of a molecule in the container.
Addition of a catalyst moves the position of EA to the right.
The area under the curve to the right of EA represents the number of molecules with enough energy to react.
The position of the peak of the curve at a higher temperature is further away from both axes.
- 13. Multiple-choice30 seconds1 pt
The total area under the distribution curve represents
total energy.
activation energy.
total number of reacting molecules.
total number of molecules present.
- 14. Multiple-choice30 seconds1 pt
The question below is about the Maxwell–Boltzmann distribution shown for a sample of a gas, X, at two different temperatures.
Which statement is correct for the higher temperature?
The area under the curve to the left of Ea decreases.
The total area under the curve increases.
The activation energy decreases.
More molecules have the mean energy.
- 15. Multiple-choice30 seconds1 pt
The graph shows the Maxwell−Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature.
The horizontal axis label is
energy
J mol−1
E
mean energy
- 16. Multiple-choice30 seconds1 pt
The following figure shows the Maxwell.Boltzmann distribution of molecular energies in a sample of gas at temperature T.
Which of the following, A, B or C, describes what the value of Y represents in the figure?
A The energy needed for a successful collision
B The minimum energy needed for a reaction to occur
C The most probable energy
A
B
C
- 17. Multiple-choice30 seconds1 pt
Line X in the diagram represents the volume (V) of gas formed with time (t) in a reaction between an excess of magnesium and aqueous sulfuric acid.
Which line represents the volume of hydrogen formed, at the same temperature and pressure, when the concentration of sulfuric acid has been halved?
- 18. Multiple-choice30 seconds1 pt
The experiment was repeated at 20 °C using a 250 cm3 conical flask.
Which statement is correct about the time taken for the cross to disappear when using the larger conical flask?
The time taken will not be affected by using the larger conical flask.
The time taken will be decreased by using the larger conical flask.
The time taken will be increased by using the larger conical flask.
It is impossible to predict how the time taken will be affected by using the larger conical flask.
- 19. Multiple-choice30 seconds1 pt
Which of the following statements about a catalyst is / are true?
(i) It speeds up the forward reaction and slows down the reverse action.
(ii) It increases the proportion of molecules with higher energies.
(iii) A homogeneous catalyst usually acts in the solid state.
(iv) It does not alter the value of the equilibrium constant.
A
B
C
D
