Physical vs. Chemical Change Quick Check Answers 9A

1. Which of the following is an example of only a physical change?

(Answer) dry ice becoming vapor

2. Which of the following demonstrates a chemical change?

(Answer) iron (Fe) reacting to water ((H2O)) and oxygen(O) to form iron oxide (Fe2O3)

3. Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?

(Answer) conduct a test to determine the chemical makeup of the molecules

4. Which of the following happens during a chemical change but does not happen during a physical change?

(Answer) Atoms of one or more substances rearrange into a new substance.

5. Which of the following example demonstrates the reversibility of a chemical change?

(Answer) recharging batteries