This lab question is: How can you distinguish a physical change from a chemical change? Which statements below are an appropriate hypothesis in response to this question? Check all that apply.

A. If a substance changes state of matter (e. g., liquid to gas), then this is a physical change because the original properties of the substance have not changed.

B. If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.

C. If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.

D. If a precipitate is formed when two substances are mixed, then a chemical change has taken place because precipitates are new substances.