Grade 8 Chemistry

Olivia, Nora, and Ava are making sandwiches for a picnic. They notice that there are molds present on the bread. What changes have to occur with the bread?

If a box of tea candle is left in a car on a summer afternoon, what change would you expect to observe in the crayons?

• gas changed to liquid

• solid changed to liquid

• liquid changed to solid

A teaspoon of water was placed in a hot casserole and seemed to disappear. What will happen to the water?

When a group of friends, including Avery, Aiden, and Zoe, are enjoying ice cream in a cup under the sun on a summer afternoon, what is the series of changes to its physical state that occurs?

• gas, solid, liquid

• solid, liquid, gas

• liquid, solid, gas

What will change if a block of butter melts?

Which of the following environmental changes shows a physical change?

• Evaporation of water from the lake

• Condensation of water vapor

• Melting of ice in the polar region

• all of the above

What happens to a piece of ice when it is left in the sun on a hot summer day?

• solid, liquid, gas

• liquid, solid, gas

• gas, solid, liquid

When a chocolate bar is left in a car on a hot summer day, what change would you expect to observe?

• solid changed to liquid

• gas changed to liquid

• liquid changed to solid

Which of the following environmental changes demonstrates a physical change?

• Sublimation of dry ice

• Freezing of water in a pond

• Boiling of water in a kettle

• all of the above

Select ALL of the characteristics of a physical change

• changes in appearance only

• a new substance is not created

• changes in the ph level

• burning and fire

• chemical bonds are not created or broken