1. Explain the difference between a heterogeneous mixture and a homogeneous mixture.
2. When a carton of milk spoils, a chemical transformation has occurred. Explain what indicates that this is a chemical transformation and not a physical transformation.
3. Give an example of each of the following:
(a) An elemental substance
(b) A compound
(c) A homogeneous mixture
(d) A heterogeneous mixture
4. A glass of fizzing seltzer water is homogeneous mixture.
5. When water is electrolyzed to produce hydrogen gas and oxygen gas a _________ transformation has occurred.