1. for which of the following activities might you want to hire a chemist?
a. testing a sample of water from a well
b. finding a comet
c. examining the structure of plant cells
d. building a garage
2. which of the following procedures involves a physical change in one of the substances?
a. creating salt by reacting sodium metal and chlorine gas
b. allowing a nail to rust
c. building a model rocket propelled by mixing baking soda and vinegar
d. grinding chalk into a fine powde 3. you have three molecules of glucose (3c6h12o6). how many oxygen atoms do you have?
a. 1
b. 3
c. 6
d. 18