Science CA #5

If a mixture changes color and bubbles, what did you see?

• Transfer of energy

• Physical Change

• Chemical Change

• Force

Matter is NOT...

• a desk

• a thought

• paper

• dog

Which one is a physical change?

• salt water

• Cooked egg

• Combining baking soda and vinegar

• Rotting banana

Tearing paper is a chemical change.

• True

• False

Physical changes can be reversed. (They can be returned to what it was, to begin with)

• True

• False

If water changes state from a liquid to a solid and solid to a gas, it is an example of a physical change.

• True

• False

When adding heat to an ice cube, it changes from a solid to a liquid, what is happening to the molecules?

• Adding heat causes the molecules to slow down and group together.

• Adding heat causes the molecules to slow down and spread apart.

• Adding heat causes the molecules to move faster and spread apart.

• Adding heat cause the molecules to move faster and group together.

What causes water to become a solid?

• Heat is removed and the causing the molecules to move fast.

• The water becomes a liquid by removing heat, which causes the molecules to move quickly.

• The water becomes a liquid by removing heat, which causes the molecules to move slowly.

• Heat is removed, which causes the molecules moves slowly.

Why is frying an egg an example of a chemical change?

• The egg was a liquid and changed to a solid.

• It can not go back to being a raw egg.

• Some of the egg was boiled and released a gas.

• Water vapor was released when it was cooked.

Is burning a piece of wood a physical or chemical change?

• Physical

  Change

• Chemical

  Change