1. Chemical Changes in Matter

2. A chemical change is a change that forms a new type of matter.
A chemical property is a feature of matter that can cause a chemical change.

3. A different type of matter forms during a chemical change.
Log- Ash
Apple- Rotting Apple
Shiny Silver- Tarnished Silver
New Bike- Rusted Bike

4. Evidence of a Chemical Change
Some Clues of Chemical Change
Changing color (food rots, metal rusts or tarnishes)
Having an unusual smell
Changing texture
Becoming more or less acidic
Getting hot or cold without being heated or cooled
Bubbles forming because a gas is givem off

5. Examples of chemical changes:
Cooking an egg
Chewing a cracker
Burning a candle
Rotting tomatoes
Can you think of any more?

6. Which of the following is a chemical change?
Boiling water
Cutting paper
Melting ice
Rusting iron

7. Which of the following is a clue that a chemical change has occurred?
A beaker become cold when you mix two liquids into it.
A liquid forms bubbles when it reaches a high temperature
Water changes color when you add food coloring to it.
A car door feels hot when you touch it in a summer afternoon.

8. What can you do to wood to cause a chemical change?
Break it
Burn it
Cut it
Saw it

9. The table lists a scientist’s observation when she stirs different substances together. Which tests show that a chemical change has taken place?
1 and 3
1 and 4
2 and 4
2 and 3
Test
Results 1
Dissolved 2
Increased temperature 3
Formed a clear liquid 4
Had a bad smell

10. Mrs. Spon pours vinegar over baking soda
Mrs. Spon pours vinegar over baking soda. At first, many bubbles form, but then they slowly stop forming. What is the BEST clue that this is a chemical change and not a physical change?
The bubbles stop forming
There were many bubbles
The baking soda did not form bubbles by itself
The bubbles did not form because a liquid was heated.

11. Which of the following is a chemical change?