Chemistry Question Secondary 4 Level

1. A diagram for the energy change during an exothermic reaction is shown

For which reactions would this be an appropriate diagram?

A. none of them

B. 1 and 2 only

C. 2 and 3 only

D. all of them

2. The diagram shows the reaction between zinc oxide and dilute hydrochloric acid.

Which terms describe the reaction?

3. Acetylene, C2H2, is a hydrocarbon. When acetylene and oxygen react, the hot flame produced can be used to weld steel.Which statement is correct?

A. Acetylene and oxygen react exothermically.

B. Acetylene is saturated.

C. Oxygen and steel react endothermically.

D. Oxygen is a gaseous fuel.

4. Some reactions are listed.

Which word correctly describes all of these reactions?

A. combustion

B. endothermic

C. exothermic

D. neutralisation

5. Which is an endothermic process?

A. burning hydrogen

B. distilling petroleum

C. reacting potassium with water

D. using petrol in a motor car engine

6. chlorine reacts with ethane to produce chloroethane and hydrogen chloride

The reaction is exothermic

The bond energies are shown in the table

What is the energy change for the reactions?

A. -1420 kJ/ mol

B. -120 kJ/ mol

C. +120 kJ/ mol

D. +1420 kJ/ mol

7. Magnesium is reacted with a dilute acid.The hydrogen gas is collected and its volume measured.The results are shown on the graph

Between which times was the reaction fastest?

A. 0 and 1 minute

B. 1 and 2 minutes

C. 2 and 3 minutes

D. 7 and 8 minutes

8. The diagram shows four experiments in which equal volumes of aqueous acid are added to equal masses of metal. Both acids have the same concentration. In which experiment has the metal completely reacted in the shortest time?

9. The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction changes with temperature.

Which statement must be correct?

A. The reaction is endothermic.

B. The reaction is exothermic.

C. The reaction produces a gas.

D. The reaction produces an acid

10. A student investigates the rate of reaction between marble chips and hydrochloric acid. The mass of the reaction flask is measured. he graph shows the results of two experiments, P and Q.

Which change explains the difference between P and Q?

A. A catalyst is added in P.

B. A higher temperature is used in P.

C. Bigger marble chips are used in Q.

D. Hydrochloric acid is more concentrated in Q.

11.Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

12. The rate of a reaction depends on temperature, concentration, particle size and catalysts.Which statement is not correct.

A. Catalysts can be used to increase the rate of reaction.

B. Higher concentration decreases the rate of reaction.

C. Higher temperature increases the rate of reaction

D. Larger particle size decreases the rate of reaction.

13. The apparatus shown is used to measure the speed of a reaction.

Which equation represents a reaction where the speed can be measured using this apparatus?

14. An experiment is carried out to investigate the rate of reaction when calcium carbonate is reacted with hydrochloric acid.The volume of carbon dioxide gas given off is measured at different intervals of time.The diagram shows pieces of apparatus used to collect gases.