Enter Title

ChemicalReactions

100

Which experiment did we do this week that was a chemical reaction?

Elephant's toothpaste

200

What are two clues that showed elephant's toothpaste was a chemical reaction?

Optional Answers:
1. It got warm.

2. It produced foam.

3. A new product formed.

300

During elephant's toothpaste, a gas was released.

What did I say was the gas that helped make all the foam?

Hint: It's in the air.

Oxygen gas

PhysicalChanges

100

Which activity this week was a physical change?

Yarn Ornaments

200

When done correctly, what should the yarn have done?

Changed its shape.

300

Besides yarn ornaments, what's another example of a physical change?

Here are some examples!

• Cutting paper
• Tearing paper
• Melting ice
• Freezing water
• Folding paper
• Crushing a can
• Breaking a pencil
• Shaping clay

Is it Physicalor Chemical?

100

Melting butter... is it Physical or Chemical?

Physical. The butter changes from a solid to a liquid, but it is still butter.

200

Toasting Bread... is it Physical or Chemical?

Chemical. Heating the bread creates new substances, so it cannot be changed back into plain bread.

300

A Rusting Bike... is it Physical or Chemical?

Chemical. The metal in the bike reacts with oxygen to form rust, which is a new substance.