Download - Obj 2 chemical and physical change
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Chemical and Physical Change
Can You Tell the Difference?
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Physical Changes
• A physical change is one that affects one or more physical properties of a substance. Physical changes can usually be undone.
Some Examples:•Crumpling up paper
•Breaking a piece of chalk in two•Dissolving salt in water
•Melting ice•Sanding wood
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Chemical Changes• A chemical change is when a substance is changed
into an entirely new substance. Chemical changes cannot be undone.
Some Clues that tell you a change is
chemical:
1. Change in color
2. Fizzing or foaming
3. Heat Generated
4. Sound
5. Light
6. Odor
Some Examples:
•Fireworks
•Vinegar and Baking Soda
•Burning Something
•Getting a Perm
•Glow Sticks
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Change It Up!!Change It Up!!The class has been split into two teams. Each team needs to form a straight line. The person at the front of each line will answer first. Their teammates must remain silent. An example of
a change will be given. The first person to correctly identify whether the change is
physical or chemical returns to the end of their teams’ line. The other person returns to their
seat. The team with the most members left by the end wins the game. Let’s Play!
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Crumpling Up A Piece Of Paper
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Fire Crackers
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Melting An Ice Cube
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Erosion of Sandstone
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Shooting a Gun
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Deflating A Ball
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Sewing a Quilt
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Dying Easter Eggs
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Glow Sticks
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Vinegar and Baking Soda
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Digesting Food
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Getting a Perm
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Making Kool-Aid
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Freezing Juice To Make Popsicles
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Sanding Wood
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Painting A Fence
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Weaving Cloth
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A Light Bulb Emitting Light
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Braiding Someone’s Hair
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Breaking Chalk In Half
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Painting Your Nails
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Mixing The Ingredients To
Make Bread
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Baking The Bread
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Fertilizing Your Lawn
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Getting a Hair Cut
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Speeding Up Your Car With NOS
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Dissolving Salt In Water
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Putting On Make-up
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Hand Warmers
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Neon Lights
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Sandblasting Your Jeans