Reaction rates test questions

1

Which of the following factors will not speed up a chemical reaction?

Increasing the temperature of the reaction

Increasing the particle size of reactants

Increasing the concentration of reactants

2

A pupil places 10g of potato into 1 mol/l hydrogen peroxide solution.

The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.

What term is used to describe a biological catalyst such as catalase?

A beaker of hydrogen peroxide solution, with a slice of potato weighing 10 grams in it.

Fermentation

Enzyme

Protein

3

A pupil places 10g of potato into 1 mol/l hydrogen peroxide solution.

The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.

The pupil counts 15 bubbles of oxygen given off every minute.

What could she do to the 10g of potato that would increase the number of bubbles per minute?

Cook it before use

Cut it into smaller pieces

Use 5g instead

4

A pupil places 10g of potato into 1 mol/l hydrogen peroxide solution.

The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.

What would happen to the number of bubbles per minute if she used a less concentrated hydrogen peroxide solution instead of the original 1 mol/l?

Stay the same

Increase

Decrease

5

A pupil places 10g of potato into 1 mol/l hydrogen peroxide solution at a temperature of 20°C.

The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.

What would happen to the number of bubbles if the temperature was increased to 30°C?

Increase

Decrease

Stay the Same

6

Which of the following reactions would be the fastest?

1 mol/l hydrochloric acid reacting with zinc powder

1 mol/l hydrochloric acid reacting with a lump of zinc

0.5 mol/l hydrochloric acid reacting with zinc powder

7

In which of the following reactions would hydrogen be produced the fastest?

Calcium powder and 2 mol/l hydrochloric acid

Calcium lumps and 2 mol/l hydrochloric acid

Calcium powder and 4 mol/l hydrochloric acid

8

What does a catalyst do?

Speeds up a reaction and is not used up in the reaction

Slows down a reaction and is not used up in the reaction

Speeds up a reaction and is used up in the reaction

9

A pupil monitors the rate of a reaction by measuring the volume of gas that is being produced every 15 seconds.

What will her units be when calculating the rate of reaction?

g s^-1

cm³ s^-1

mol l^-1 s^-1

10

Which line on this rate graph shows the slowest reaction?

Graph of mass of product produced against time from start of reaction, with 3 lines plotted. They all start at zero and level off at the same mass of product produced. Line A has the highest gradient. Line C has the lowest. The gradient of line B is between those of A and C.