Year 10 Rates of Reaction Summary

An example of a fast chemical reaction is:

• The rusting of a metal gate.

• The souring of milk.

• Bread going mouldy.

• A firework exploding.

When Magnesium strips are ground to powder:

• The mass increases.

• The surface area increases.

• The mass decreases.

• The surface area decreases.

When magnesium strips are ground down into magnesium powder:

• The rate of reaction increases.

• The rate of reaction decreases.

• The rate of reaction remains the same.

Sulfur is:

• A yellow metallic solid.

• A yellow non-metallic solid.

• A grey metallic solid.

• A grey non-metallic solid.

When we increase the temperature of a reaction:

• There are more particles present.

• The surface area increases.

• The particles gain kinetic energy.

• The particles lose kinetic energy.

Collision theory states that the following are required for a reaction:

• Collisions.

• Collisions with the correct energy.

• The correct energy.

• Successful collisions with the correct energy.

Increasing the concentration of acid means:

• Using a greater total volume.

• Using a lesser total volume.

• Diluting the acid with water.

• Increasing the ratio of acid to water.

In the sodium thiosulphate reaction we timed how long it took for:

• A cloudy yellow precipitate to form.

• Bubbles to be produced.

• The solution to turn black.

• Enough yellow solid to form to block out an X.

The variable we measure during an experiment is:

• The dependent variable.

• The independent variable.

• The control variables.