1. Which reaction between marble chips and acid would be fastest?
A. 5g of powdered marble and hot acid
B. 5g of powdered marble and cold acid
C. 5g of marble chips and hot acid
D. 5g of marble chips and cold acid
2. The diagram shows the apparatus used to measure the rate of a chemical reaction.
For which of the following reactions can the rate be measured using this apparatus?
I. NaOH + HCl→ NaCl + H2O
II. CaCO3 + 2HCl→ CaCl2 + H2O + CO2
III. 2H2O2→ 2 H2O + O2
A. all of them
B. I and II only
C. I and III only
D. II and III only
3. A student investigated the rate of reaction between zinc and excess sulfuric acid.
The graph shows the results of two experiments, X and Y.
Which one of the following would explain the difference between X and Y?
A. Y was carried out at a higher temperature
B. Y was carried out using less concentrated acid
C. X had a catalyst added
D. X was carried out using powdered zinc
4. Which changes decrease the rate of reaction between calcium carbonate and dilute hydrochloric acid?
I. Decrease the temperature
II. Decrease the concentration of acid
III. Decrease the size of the calcium carbonate pieces
A. I, II and III
B. I and II only
C. I and III only
D. II and III only
5. Which of the following is NOT true about catalysts?
A. Catalysts are not chemically changed in the reaction
B. Catalysts speed up a reaction
C. Catalysts provide an alternative path of lower activation energy
D. Catalysts do not take part in the reaction
Q6-7: A student adds small pieces of magnesium to dilute hydrochloric acid in a test tube. The reaction is exothermic.
6. What does the student see as the magnesium reacts and what happens to the temperature of the acid during the reaction?
Observation
Temperature
A
bubbles
falls
B
bubbles
rises
C
Solution turns cloudy
falls
D
Solution turns cloudy
rises
7. Two ways in which the student could make the reaction faster are..
A. Cool the acid and add water to the acid
B. Use warmer acid and one large piece of magnesium
C. Add water to the acid and powder the magnesium
D. Increase the acid concentration and use warmer acid
8. Hydrogen peroxide, H2O2, decomposes slowly into water and oxygen as shown:
2H2O2 → 2H2O + O2
The decomposition occurs faster if manganese(IV)oxide is added.
The manganese(IV) oxide acts as …..
A. a reducing agent
B. a catalyst
C. an acid
D. a base
9. A 1.0 mol/dm3 solution of hydrochloric acid reacts more slowly with marble chips than the same volume of a 2.0 mol/dm3 solution.
Which of the following is the correct reason for this observation?
1.0 mol/dm3 acid contains..
Collisions between reactants are..
A
less particles per cm3
more frequent with 1.0 mol/dm3 acid
B
less particles per cm3
less frequent with 1.0 mol/dm3 acid
C
more particles per cm3
more frequent with 1.0 mol/dm3 acid
D
more particles per cm3
less frequent with 1.0 mol/dm3 acid
10. A student investigates the effect of four solids, A,B,C and D, on the decomposition of hydrogen peroxide using the following apparatus:
He adds 1g of solid to 25cm3 of hydrogen peroxide solution and records the time taken to collect 20cm3 of oxygen. He then filters off, dries and weighs the solid.
Which solid acted as the best catalyst according to the following results?
