How can you distinguish a physical change from a chemical change?
Which statements below are an appropriate hypothesis in response to this question?
a. If a substance changes state of matter (e.g., liquid to gas), then this is a physical change original properties of the substance have not changed.
b. If a substance undergoes a physical change, then it will retain most of its original properti no new substance is formed.
c. If a substance undergoes a chemical change, then it will not retain its original properties new substance is formed.
d. If a precipitate is formed when two substances are mixed, then a chemical change has ta because precipitates are new substances.