. 1. When autumn leaves change from red to green to red, orange and yellow:
a. A chemical change has occurred. b. A physical change has occurred. C.
A chemical change is about to happen.
2. What type of change occurs when a nail rusts?
a. nuclear change b. physical change c. chemical change
3. A physical change means that: a. matter has changed from one substance into another b. matter has changed size, shape or form c. matter has morphed into anti-matter
4. A chemical change means that: a. there is a change in the size or shape of an object b. one substance has changed into another c. a bunch of glasses have changed all at once
5. What kinds of chemical changes occur in your body? a. Food is broken down by enzymes in your stomach. b. bones breaking c. your heart beating
6. What type of change has occurred when an apple core turns brown? a.
physical b. cellular c. chemical
7. What type of change is weathering? a. physical change b. chemical change c. seasonal change
8. How can salt be made? a. in a chemical reaction between sodium and chlorine b. by mixing pepper and sugar c. by crushing a piece of salt cane into tiny pieces
9. Which of these is a chemical change that takes place over a long period of time? a. adding chlorine to the pool b. making chocolate milk c. the rusting of metal