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1. You burn a piece of toast when leaving it in the oven. The bread is now black. ______

2. You forget to dry a knife after washing it. The next time you look at is, you see reddish-brown spots on the blade. _____
3. You use a blow-dryer to dry your hair. _____
4. A straight piece of wire is coiled to form a spring. _____
5. Food color is dropped into water to give it color. _____
6. Chewing food to break it down into smaller particles represents a change, but the changing of starch into sugars by enzymes in the digestive system represents a change. ______
7. In a fireworks show, the fireworks explode giving off heat and light. _____
8. You crush a piece of chalk into a fine powder. _____
9. You dissolve chocolate syrup into a glass of milk and the milk is now a shade of brown. _____
10. You toast a marshmallow over a campfire until it has a golden-brown crust. ______
11. You snap a glowstick open and it begins to glow a bright yellow color and feels warm in your hand. ______

options are:
physical change
chemical change

1 answer

Here are the classifications for each scenario:

  1. You burn a piece of toast when leaving it in the oven. The bread is now black. Chemical change
  2. You forget to dry a knife after washing it. The next time you look at it, you see reddish-brown spots on the blade. Chemical change
  3. You use a blow-dryer to dry your hair. Physical change
  4. A straight piece of wire is coiled to form a spring. Physical change
  5. Food color is dropped into water to give it color. Physical change
  6. Chewing food to break it down into smaller particles represents a physical change, but the changing of starch into sugars by enzymes in the digestive system represents a chemical change. Chemical change
  7. In a fireworks show, the fireworks explode giving off heat and light. Chemical change
  8. You crush a piece of chalk into a fine powder. Physical change
  9. You dissolve chocolate syrup into a glass of milk and the milk is now a shade of brown. Physical change
  10. You toast a marshmallow over a campfire until it has a golden-brown crust. Chemical change
  11. You snap a glowstick open and it begins to glow a bright yellow color and feels warm in your hand. Chemical change

So the responses are as follows:

  1. Chemical change
  2. Chemical change
  3. Physical change
  4. Physical change
  5. Physical change
  6. Chemical change
  7. Chemical change
  8. Physical change
  9. Physical change
  10. Chemical change
  11. Chemical change