Physical and Chemical Changes Review

1.

Multiple Choice

1 min

1 pt

Which example best describes a physical change?

baking a pie

burning a candle

making a paper airplane

mixing vinegar with baking soda

2.

Multiple Choice

1 min

1 pt

Brad accidentally left his crayon box in the car on a hot day. Which best explains what happened to his crayons?

crayons melted; changed from solid to liquid

crayons melted; changed from liquid to solid

crayons evaporated; changed from liquid to solid

crayons reacted chemically

3.

Multiple Choice

1 min

1 pt

Which is the best example of a change that can be undone?

clay put in an oven to harden

cake batter put in an oven to bake

chocolate left in a warm car to melt

wood being burnt

4.

Multiple Choice

1 min

1 pt

A glass of salt water is put on a windowsill. After several days the water has disappeared, and there is only a film of white crystals left in the bottom. Which best explains what has happened?

The salt caused the water to dry up.

The water evaporated and left the salt behind.

The water and the salt evaporated and left a film behind

There is no explanation. Magic

5.

Multiple Choice

1 min

1 pt

Is this a physical or chemical change?

Physical

Chemical

Neither

Both

6.

Multiple Choice

1 min

1 pt

Which is an example of a chemical change?

melting ice to make water

baking cake batter to make a cake

putting cheese on bread to make a cheese sandwich

cutting an orange into slices for a snack

7.

Multiple Choice

30 sec

1 pt

Gwen’s family built a wood fire in the fireplace. The next day, Gwen noticed that there was no wood left in the fireplace, only ashes. Which best explains this?

Wood is separated from ashes as it burns.

Wood becomes a new substance as it burns.

Ashes have the same properties as wood.

Ashes are the same substance as wood.

8.

Multiple Choice

1 min

1 pt

Wendy left her bike outside, buried in snow. In the spring, when the snow melted, she found her bike covered in rust. Which best describes the change to the bike?

It was a chemical change, because the bike was a different color.

It was a chemical change, because the rubber tires were deflated.

It was a chemical change, because rust is a new substance on the metal.

It was a chemical change, because rust can be removed from the metal.

9.

Multiple Choice

1 min

1 pt

Jonathan is burning wood in a bonfire. What change is occurring during the fire?

The wood is gaining more mass.

The wood is changing into a liquid.

The wood is dissolving into the ground.

The wood is releasing a gas as smoke.

10.

Multiple Choice

1 min

1 pt

Is this a physical or chemical change?

Physical

Chemical

Neither

Both

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