Chemical reactions

Which is not a chemical reaction:

• dissolving sugar in water

• oxidized copper

• photosynthesis

• respiration

How is a compound different from a mixture?

• A compound is made of one substance.

• A compound is made of non metals.

• A compound cannot be separated into it's parts.

• A compound cannot be separated with physical changes.

Which is an example of a chemical reaction?

• melting metal

• stirring salt in water

• tarnish on silverware

• rain falling

Substances on the left side of a chemical reaction are called:

• elements

• reactants

• products

• protons

What chemical reaction creates oxygen for animals to breathe?

• rust

• oxidation

• chemical change

• photosynthesis

What chemical reaction creates carbon dioxide for plants to breathe?

• combustion

• tarnish

• slime

• respiration

When one atom breaks its old links and forms new links with different atoms, this is a:

• physical change

• miracle

• chemical reaction

• sublimation

Scientists keep track of how many atoms are used in chemical reactions by:

• looking it up

• writing a chemical equation

• reading a book

• counting the atoms

The chemical reaction plants use to make sugar is:

• complicated

• unknown

• respiration

• photosynthesis

The chemical reaction that animals use to burn sugar for energy is:

• photosynthesis

• not a chemical reaction

• a precipitate

• respiration