Rate of reaction and Homologous series

The results of two separate reactions between excess calcium carbonate and hydrochloric acid

are shown.

• More calcium carbonate was used in the second reaction.

• The same volume of more concentrated acid was used in the second reaction.

• The second reaction was allowed to react for longer.

• The temperature was higher in the second reaction.

Magnesium is reacted with a dilute acid.

The hydrogen gas is collected and its volume measured.

The results are shown on the graph.

• 0 and 1 minute

• 1 and 2 minutes

• 2 and 3 minutes

• 7 and 8 minutes

The effect of temperature on the rate of the reaction between marble chips and hydrochloric acid

can be investigated by measuring the production of carbon dioxide. Which item of equipment is not required for the investigation?

• condenser

• gas syringe

• stopclock

• thermometer

The diagram shows four experiments in which equal volumes of aqueous acid (all in an excess)

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?

• A

• B

• C

• D

The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction

changes with temperature.

• The reaction is endothermic.

• The reaction is exothermic.

• The reaction produces a gas.

• The reaction produces an acid.

Powdered marble reacts with hydrochloric acid using the apparatus shown. The gas syringe fills in 36 seconds.

• 9 seconds

• 18 seconds

• 36 seconds

• 72 seconds

Which reaction is reversible?

• Cu + ZnSO4 → CuSO4 + Zn

• CuO + H2SO4 → CuSO4 + H2O

• CuO + H2 → Cu + H2O

• CuSO4.5H2O → CuSO4 + 5H2O

The equation shows a reaction that is reversed by changing the conditions.

• A

• B

• C

• D

Which reaction is not a reversible reaction?

• combustion of alkanes

• combustion of alkanes

• melting lead(II) bromide

• thermal decomposition of hydrated cobalt(II) chloride

The diagram shows the change from an anhydrous salt to its hydrated form.

• forward reaction requires heat and water

• forward reaction requires water only

• reverse reaction requires heat and water

• reverse reaction requires water only