6th Grade Science Review

Front

What is the purpose of a catalyst in a chemical reaction?

Back

To speed up the reaction.

Front

What distinguishes a chemical change from a physical change?

Back

A new substance is formed in a chemical change, while no new substance is formed in a physical change.

Front

What type of change is nails rusting?

Back

Chemical Change.

Front

Why does a tiny piece of sand sink in water?

Back

Sand is more dense than water.

Front

What type of change is ice melting?

Back

Physical Change.

Front

Define a chemical change.

Back

A process where substances combine or break apart to form new substances.

Front

Define a physical change.

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is density?

Back

Density is the mass of a substance divided by its volume.

Front

Give an example of a chemical change.

Back

Burning wood.

Front

Give an example of a physical change.

Back

Melting ice.