How foods Change

What evidence do the pictures give to show that this change is reversible?

• Freezing changes the juice pop into a different kind of material.

• Adding heat to the juice pop makes it turn brown and melt.

• The material in the juice pop stays the same even when its form changes.

. What causes matter to change in each photo? Use a word from the box to identify each change.

• cooking

• burning

• melting

. What causes matter to change in each photo? Use a word from the box to identify each change.

• cooking

• burning

• melting

. What causes matter to change in each photo? Use a word from the box to identify each change.

• cooking

• burning

• melting

Which are irreversible changes? Choose all that apply.

• a fire burning in a fireplace

• a melting ice-cream cone

• muffins baking in the oven

• a frozen lake in the winter

How do you know if a change is irreversible? Choose all that apply.

• The material changes from a solid to a liquid.

• The material becomes a different type of material.

• The material can never go back to the way it was before the change.

• The material stays the same type of material.

Write reversible or irreversible to identify each change.

Fire burns wood.

• reversible

• irreversible

Write reversible or irreversible to identify each change.

Freezer freezes lemonade.

• reversible

• irreversible

Write reversible or irreversible to identify each change.

Heat cooks vegetables.

• reversible

• irreversible

Write reversible or irreversible to identify each change.

Heat cooks popcorn kernels.

• reversible

• irreversible