UNIT 9 Review

What happens to particles during a chemical change?

• They stay the same

• They disappear

• They rearrange to form a new substance

• They turn into ice

Which of the following is an example of a physical change?

• Burning paper

• Melting ice

• Baking a cake

• • Iron rusting

Which of these is NOT a sign of a chemical change?

• Temperature changes

• Color change

• Change in shape

• Bubbles forming

Which of the following changes can usually be reversed?

• Melting butter

• Frying an egg

• Burning wood

• Baking bread

What is a chemical change?

• A change in size or shape

• A change that makes something cold

• A change that forms a new substance

• A change that is invisible

What does "non-reversible" mean?

• Can be changed back

• Cannot be changed back

• Can be stretched

• Can melt

What is a “chemical”?

• A type of metal

• A substance used in a reaction

• A food ingredient

• A kind of energy

“Substance” means...

• A way to measure time

• A kind of test

• A material with specific properties

• A drop of water

What does it mean to “spoil” food?

• To cook it

• To keep it fresh

• To make it delicious

• To cause it to rot or go bad

What does “charcoal” come from?

• Melted plastic

• Burned wood

• Frozen metal

• Spoiled food