An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone. 2. Two...

1. An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone.
2. Two chemical are mixed together and a gas is produced.
3. A bicycle changes color as it rusts.
4. A solid is crushed to a powder.
5. Two substances are mixed and light is produced.
6. A piece of ice melts and reacts with sodium.
7. Mixing salt and pepper.
8. A marshmallow is toasted over a campfire.