Unit 3 | Chemical and Physical Changes

Front

Which example is not a physical change?

• separate five bananas from the bunch
• peel bananas
• cut bananas
• bananas turn brown

Back

bananas turn brown

Front

When did a chemical change occur?

Back

Nails sits outside and turns red.

Front

Pick the answer that states a chemical change: Tin metal is placed over a fire and heats up., Strip of paper is burned and a new substance is formed., Water is boiled and disappears., Solid wax melts.

Back

Strip of paper is burned and a new substance is formed.

Front

Ice forms because heat is removed, causing the particles to move slower. This changes the water from a liquid to a solid.

Back

True

Front

What happens when water freezes?

Back

Heat is removed, and a solid is formed.

Front

Bubbles form because heat is removed, causing the molecules to move quickly as the water boils.

Back

False

Front

Removing heat from liquid water will cause the movement of the molecules to ____, forming a ______.

Back

decrease; solid

Front

A change from liquid to gas is a:

Back

physical change

Front

When heat is removed, molecules in the water slow down, causing the liquid to become a solid.

Back

True

Front

Adding heat causes the molecules of water to move slower and closer together, resulting in a change of state.

Back

False