Chemistry 2 Quizzes
To retake a quiz, write the title of the quiz and your name and period at the top. As you answer each question, explain why you choose that answer. Turn in the quiz the next day to the basket by my computer.
Please read the instructions before starting:
Day 5 Quiz
1. Which of the following defines a chemical change?
a. When two substances mix, but the substances stay the same
b. When water boils
c. When the form of the chemical changes, but it is still the same substance
d. When chemicals react to form a new substance
2. Which of the following defines a physical change?
a. When chemicals react to form a new substance
b. When paper burns
c. When you describe the characteristics of an object
d. When some of the physical properties of the chemical change, but it is the same substance
3. What happens to molecules when you heat them up?
a. They get closer together and move slower
b. They spread out and move quickly
c. They get closer together and move quickly
d. They spread out and move slowly
4. Which of the following would be an exothermic reaction?
a. Photosynthesis (takes energy from the sun and uses it to make sugars)
b. Respiration (our bodies break down sugars and release energy)
5. Which of the following would be characteristic of an endothermic reaction?
a. The temperature of the beaker would decrease because the reaction is absorbing heat
b. The temperature of the beaker would increase because the reaction is giving off heat
c. The temperature of the beaker would decrease because the reaction is giving off heat
d. The temperature of the beaker would increase because the reaction is absorbing heat
6. Which of the following best matches the shape of the graph that we would expect from a phase change?
A B
Identify each of the following as chemical (A) or physical changes (B) :
7. Boiling water
8. Burning propane
9. Kool-Aid dissolving in water
10. Wax melting
11. Baking soda and vinegar fizzing
