Question

determine if each of the following are chemical or physical changes * 8 points
chemical change physical change
scrambling eggs in a bowl
a silver spoon tarnishing
a puddle drying up
chopping onions
copper turning green
burning paper
adding drink powder to water
bike spokes rusting

Explanation:

1. Scrambling eggs in a bowl: Chemical change as proteins in eggs denature due to heat - a new substance with different properties is formed.
2. A silver spoon tarnishing: Chemical change as silver reacts with sulfur - containing substances in air to form silver sulfide.
3. A puddle drying up: Physical change as water changes from liquid to gas (evaporation), no new substance is formed.
4. Chopping onions: Physical change as it only changes the physical form of onions, no new chemical substances are created.
5. Copper turning green: Chemical change as copper reacts with oxygen, water and carbon - dioxide in air to form copper carbonate.
6. Burning paper: Chemical change as paper reacts with oxygen to produce carbon - dioxide, water vapor and ash, new substances are formed.
7. Adding drink powder to water: Physical change as it is a process of dissolution, no new chemical substances are formed, just a mixture.
8. Bike spokes rusting: Chemical change as iron in bike spokes reacts with oxygen and water to form iron oxide.

Answer:

1. Chemical Change
2. Chemical Change
3. Physical Change
4. Physical Change
5. Chemical Change
6. Chemical Change
7. Physical Change
8. Chemical Change