How can rate of reaction be measured in reactions?

• Measure mass lost when gas produced.

• Measure volume of gas produced.

• Measure colour change or formation of a solid.

• Measure time taken for liquid to disappear.

Look at the graph. At what time does the reaction finish?

• 4 minutes

• 5 minutes

• 6 minutes

• 7 minutes

Look at the graph. Use the tangent to the curve to work out the rate of reaction.

• 0.5

• 1

• 1.5

• 2

Look at the graph. What does the tangent to the curve show?

• Time taken

• Concentration

• Rate

• Mass

Increasing concentration of a reactant...

• ... decreases rate

• ... increases rate

Increasing temperature leads to rate...

• ... increasing

• ... decreasing

Increasing the pressure of a reaction in which reactants are gaseous will lead to the rate of reaction...

• ... decreasing

• ... increasing

A student investigates the rate of reaction between zinc and excess dilute hydrochloric acid.

The table shows his results. What is the rate of the reaction?

• 8.2

• 8.4

• 21

• 84

The decomposition of hydrogen peroxide is catalysed by adding a small amount of manganese (IV) oxide. Which of the graphs below shows the mass of the catalyst as the reaction takes place?

• A

• B

• C

• D

A student carries out an experiment to measure accurately the temperature changes when different metals are added to iron(II) sulfate solution. State a suitable container to measure the iron(II) sulfate solution in this experiment.

• Beaker

• Measuring cylinder

• Spatula

• Mass balance