Physical and Chemical Changes Review

Front

Which example best describes a physical change? Options: baking a pie, burning a candle, making a paper airplane, mixing vinegar with baking soda

Back

making a paper airplane

Front

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

Back

crayons melted; changed from solid to liquid

Front

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

Back

chocolate left in a warm car to melt

Front

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. What happened?

Back

The water evaporated and left the salt behind.

Front

How had the flag most likely been changed by the sun?

Back

The flag’s colors were dull and faded

Front

Which is an example of a chemical change?

Back

baking cake batter to make a cake

Front

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?

Back

Wood becomes a new substance as it burns.

Front

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?

Back

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

Front

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

Back

The wood is releasing a gas as smoke.

Front

What happens to the inside of an egg when it is boiled?

Back

The liquid becomes solid.