Question 27 – Rates of reaction - Edexcel Chemistry Questions

A student investigates the rate of reaction between calcium carbonate chips and dilute nitric acid.

The experiment is repeated three times:

once using a single large lump of calcium carbonate instead of smaller chips (keeping the total mass the same)
once with a suitable catalyst added to the mixture
once using a larger volume of nitric acid of the same concentration

In each case, all other conditions are kept the same.

Select the correct word in each row to show the change in the rate of reaction.

Case	Change in rate of reaction
Calcium carbonate is used as a single large lump instead of smaller chips	faster	slower	unchanged
A catalyst is added to the reaction mixture	faster	slower	unchanged
A larger volume of nitric acid of the same concentration is used	faster	slower	unchanged

A student investigates the rate of reaction between calcium carbonate chips and dilute nitric acid.

The experiment is repeated three times:

once using a single large lump of calcium carbonate instead of smaller chips (keeping the total mass the same)
once with a suitable catalyst added to the mixture
once using a larger volume of nitric acid of the same concentration

In each case, all other conditions are kept the same.

Select the correct word in each row to show the change in the rate of reaction.

Case	Change in rate of reaction
Calcium carbonate is used as a single large lump instead of smaller chips	faster	slower	unchanged
A catalyst is added to the reaction mixture	faster	slower	unchanged
A larger volume of nitric acid of the same concentration is used	faster	slower	unchanged

Rates of reaction