Describe how a crystal of alum differs from a crystal of potassium aluminum sulfate

An alum is a double salt where you have a trivalent metal sulfate and a monovalent metal sulfate. Meanwhile, a crystal of potassium aluminum sulfate is potash alum!

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.