Chemical and Physical Reactions

Front

What is a molecule?

Back

A molecule is made of more than one atom.

Front

What type of change occurs when a copper penny turns greenish after a few years?

Back

Chemical Change.

Front

What is an example of a chemical change involving a copper penny?

Back

A copper penny turning greenish after a few years.

Front

What is a catalyst?

Back

A substance that helps a chemical reaction to happen faster.

Front

What are physical properties?

Back

Properties that can be observed without changing the identity of the substance.

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change alters the substance's identity, while a physical change does not.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What happens to the atoms in a chemical reaction?

Back

Atoms are rearranged to form new substances.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is an example of a chemical reaction?

Back

Burning wood is an example of a chemical reaction.