Chemistry Test Review

Front

What property does helium have that causes a match to go out when held above it?

Back

Helium is less dense than air.

Front

Which of the following is NOT evidence that a chemical reaction has occurred?

Back

Melting is not evidence of a chemical reaction.

Front

What does flammable mean?

Back

Flammable means easily set on fire.

Front

What are the original substances you start with before a chemical reaction takes place?

Back

Reactants are the original substances before a chemical reaction.

Front

What does the term 'element' refer to in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.