CAIE IGCSE Chemistry 6.2.2 Catalyst Increases the Rate of a Questions

Explain how catalysts increase reaction rate through an alternative lower-activation-energy pathway without changing the final amount of product.

Exam points

define a catalyst as increasing reaction rate while remaining chemically unchanged
explain that a catalyst changes how quickly products form, not the final stoichiometric amount
recognise that a catalyst provides an alternative pathway with lower activation energy
use catalyst evidence in unfamiliar reaction-rate experiments

[Maximum number: 1]

The equation for the decomposition of hydrogen peroxide, $\mathrm{H}_{2} \mathrm{O}_{2}$ , is shown.

2 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

In an experiment, the total volume of oxygen produced is $100 \mathrm{~cm}^{3}$ .
The experiment is repeated using 1.00 g of a solid catalyst. All other conditions remain the same.
Which row describes the total volume of oxygen and the mass of the catalyst at the end of the second experiment?

total volume of oxygen
$/ \mathrm{cm}^{3}$

mass of catalyst
/g

more than 100

less than 1.00

100

less than 1.00

100

1.00

more than 100

1.00

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CAIE IGCSE Chemistry 6.2.2 Catalyst Increases the Rate of a Questions question 1