Chemical Reactions

The original substances are called...

• reactants

• products

Chemical reactions usually involve a change in appearance or energy.

Which are theseveral clues to indicate that a chemical reaction might have taken place?

• energy, evaporation filtration and destillation

• energy change, colour change, gas formation and precipitate formation

• energy change and colour change.

• precipitate formation and oxidation

What is combustion?

• It is a rapid chemical combination of a substance with oxygen.

• It is a chemical reaction where a substance changes because oxygen is added.

• It is a natural, necessary, and useful chemical reaction.

What is oxidation?

• It is a rapid chemical combination of a substance with oxygen.

• It is a chemical reaction where a substance changes because oxygen is added.

• It is a natural, necessary, and useful chemical reaction.

What is fermentation?

• It is a rapid chemical combination of a substance with oxygen.

• It is a chemical reaction where a substance changes because oxygen is added.

• It is a natural, necessary, and useful chemical reaction.

What are the three parts of the triangle of fire?

• fuel, heat and oxygen.

• carbon dioxide, heat and light.

• fire, heat and light.

• heat, oxygen and carbon dioxide.

Chemical reactions can be caused by:

• sound energy, oxygen, bacteria or fungi.

• thermal energy, oxygen, bacteria or fungi.

Is this a chemical reaction or a mixture?

After combining, the substances maintain original properties.

• mixture

• chemical reaction

Is this a chemical reaction or a mixture?

After combining, the substances original properties change.

• mixture

• chemical reaction

Is this a chemical reaction or a mixture?

Products are now chemically linked

• mixture

• chemical reaction