1. A cotton ball is dipped in alcohol and wiped across a tabletop. Explain what happens to the alcohol molecules that are deposited on the tabletop? Is this a physical or chemical change? 2. A skillet...

1. A cotton ball is dipped in alcohol and wiped across a tabletop. Explain what happens to the alcohol molecules that are deposited on the tabletop? Is this a physical or chemical change?

2. A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop, thereby escaping the skillet. Identify any physical or chemical changes.