Chemical Reactions

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is...

• To warm up the reaction

• To speed up the reaction

• To create more reactants

• To stop the reaction

Nails rusting is a...

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fireworks are a...

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Baking a cake is a...

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Lighting a match is a...

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the atoms of matter after a chemical change?

• The atoms are destroyed.

• New atoms are created

• Bonds are broken and new bonds are formed.

Tags

NGSS.MS-PS1-5

Two 6th Grade students mixed two substances together in a container covered with a balloon. After the mixing the balloon inflated. What sign is present that chemical reaction has happened?

• A precipitate formed.

• The color changed.

• The temperature changed.

• A gas was produced.

Tags

NGSS.MS-PS1-2

A student accidently spilled vinegar into a glass of milk. Soon a strange solid appeared. What sign is present that a chemical reaction has happened?

• A precipitate formed.

• The color changed.

• The temperature changed.

• A gas was produced.

Tags

NGSS.MS-PS1-2

Logs were burned in a fireplace. What sign is present that a chemical reaction happened?

• A precipitate formed.

• The total mass decreased.

• The total mass increased.

• Heat was given off.

Tags

NGSS.MS-PS1-2

Which of the following is a sign that a chemical reaction has occurred?

• A change in color

• A change in state

• A change in size

• A change in shape

Tags

NGSS.MS-PS1-2