Chemical reactions -exercises for junior science
Click on the following movie clips. Explain why they are an example of a chemical reaction.

What is the new product formed in this reaction?

A chemical reaction must also be

 

 

The burning of oil is an example of a chemical reaction because

Look at the fire extinquisher. It is liquid carbon dioxide escaping as a gas. This is

 

 

The chemical reaction involved here produces electricity for the light globe to glow.

Is the light globe glowing an example of a chemical reaction? Your teacher might like to discuss.

Hint- Is the heat created by rubbing your hands an example of a chemical reaction?

 

 

 

Lead nitrate and potassium iodide are mixed. Look at the video on the right. Is this a chemical reaction? Why is this a chemical reaction.

 

 

When magnesium metal is added to hydrochloric acid the solution becomes very hot. This is a chemical reaction because

 

 

Magnesium burning in air is an example of a chemical reaction. What can you see that would identify this as a chemical reaction?

 

 

Hydrogen is an explosive gas and reacts violently with oxygen to produce water. Now what clues are given in the video that a chemical reaction has taken place?