1. When pentan-2-one undergoes complete combustion, carbon dioxide and water are the only products. The equation for this reaction is shown.

What are the values of a and b in this equation?

• 	a	b
  A.	7.0	5.0
  B.	7.5	5.0
  C.	8.0	6.0
  D.	8.5	6.0

2.

3. If the unit of rate constant, $k$, for a reaction is mol−2 dm6 s−1, what is the overall order of the reaction?

4. The rate law for the reaction 2 NO(g)+O2(g)→2 NO2(g), is determined to be second-order with respect to $\mathrm{O}$ and first order with respect to O2.
Which of the mixtures below would create the fastest initial rate?

5. Two experiments were conducted, and the rates of reactions were measured. In the first experiment, 50 cm^3 of 0.010 mol dm^−3 of sulfuric acid was added to 0.200 g of zinc metal at 25∘∘C. In the second experiment, 50 cm^3 of 0.010 mol dm^−3 of sulfuric acid was added to 0.200 g of zinc metal at 25∘C, followed immediately by 100 cm^3 of distilled water. What happened to reaction rate in the second experiment, and why?

6. A 1 dm3 container contains $2$at equilibrium. What is the value of the equilibrium constant?

7. What effect would increasing the pressure have on the concentration of H2 and CO2 for the following reaction?

8. The rate equation for the thermal decomposition of hydrogen peroxide is $]$.
Which of the following graphs shows the relationship between the rate and the temperature of this reaction?

9. What set of descriptions is correct about the following energy level diagram?

10. What cannot be used to determine the rate expression for a reaction?

11. If the rate expression for a reaction 2 X+Y→Z is rate = k[X]2, which of the following is most likely to be correct?

12. Which of the following graphs would accurately represent a reaction with a rate expression rate = k [A]2

A.				B.
C.				D.

13. In the following reaction, the initial rate of appearance of CO2 is measured to be 3.0×10−2 mol dm−3 s−1, what is the rate of disappearance of O2

14. Which row of the table correctly states the changes that occur when the temperature is increased for the following reaction:

• 	Value of the equilibrium constant	Position of equilibrium
  A.	Changes	Shifts towards the products
  B.	Changes	Shifts towards the reactants
  C.	Stays the same	Shifts towards the products
  D.	Stays the same	Shifts towards the reactants

15. The Maxwell-Boltzmann distribution plot below is for the same substance with the same concentration at different temperatures. Which statement is correct about the total number of molecules for each temperature?

16.

17. Magnesium and excess hydrochloric acid react together to produce hydrogen gas. This experiment was conducted two times with different hydrochloric acid concentrations but with the same magnesium mass.
In both cases, the volume of hydrogen gas produced was measured at different times, and graphs 1 and 2 were plotted accordingly, as shown below. Choose the letter representing the stage where the rate of reaction is the fastest.

18. Nitrogen gas reacts with hydrogen gas to produce ammonia as per the following chemical equation:

If 0.86 $\text{moles}$ of N2 are mixed with 0.50 moles of H2, which reactant is in excess?

19. For a reaction that is first order with respect to [M], the rate of the reaction is 0.5 s−1 when the concentration of $M$ is 1.0 mol dm−3. What would be the most likely rate when the concentration of $M$ for the same reaction is 1.5 mol dm−3 ?

20. Which of the following reactions has the largest rate constant, k, under the same reaction conditions?

21. Reaction 1 has a larger frequency factor, $A$, than reaction 2 but a smaller activation energy, Ea.
Which of the following graphs is correct?
lnk=−Ea/RT+lnA

22. Which statement about the relationship between Gibbs free energy change and the equilibrium constant is correct?

23. Propane gas is combusted in oxygen gas according to the following equation:

When 11.0 $g$ of propane gas (MW 44.097) is combusted in 8.0 $g$ of oxygen gas, 0.20 $moles$ of water vapor is produced.
What is the excess reactant and how many moles remain after the reaction is complete?

25. The following graph represents the change of concentration of a gaseous reactant and gaseous product during a reaction. At t=10 mins, the temperature is increased and at t=15 mins, the volume of the reaction vessel is increased.

Which row of the table below correctly describes the enthalpy change of the forward reaction and the moles of gas of the reactants and products?

• 	Enthalpy change of forward reaction	Moles of gas
  A.	Exothermic	Reactants more than the products
  B.	Exothermic	Reactants less than the products
  C.	Endothermic	Reactants more than the products
  D.	Endothermic	Reactants less than the products