Video: Chemical and Physical Changes

What is unique about a chemical change?

• The substances remain the same

• A new substance is formed

• It is a simple mixture

• No new substance is formed

Which of these is not evidence that a chemical changed has occurred?

• Make smells

• Release light

• Release gases

• Retain properties of the original substances

Is baking a cake a chemical change?

• Yes

• No

__________ changes cannot be undone, meaning they are mostly irreversible.

• Physical

• Chemical