Chapter 1 Review
2. How does the ozone layer protect Earth?
3. Why did scientists think that the thinning of the ozone layer
might be related to CFCs?
4. Contrast mass and weight.
5. During a chemistry lab, a student noted the following data
about an unknown chemical she was studying: colorless,
dissolves in water at room temperature, melts at 95°C, boils at
800°C. Classify each piece of data as either qualitative data or
quantitative data.
6. Identify the dependent variable and the independent variable in
the following experiments.
a. A student tests the ability of a given chemical to dissolve in
water at three different temperatures.
b. A farmer compares how his crops grow with and without
phosphorous fertilizers.
c. An environmentalist tests the acidity of water samples at five
different distances from a factory.
7. Explain why hypotheses and theories are always tentative
explanations.
8. List two possible hypotheses about the relationship between
ozone and CFCs.
9. Classify each kind of research as either pure or applied.
a. A scientist studies plants in a rain forest in search of
chemicals that might be used to treat AIDS.
b. A researcher studies the effects of hormones on the brain of
a worm.
c. A researcher tries to develop cleaner burning fuels to help
reduce air pollution.
10. State two rules you should follow when handling chemicals.
11. How should you dispose of the following items in the lab:
broken glass, products of chemical reactions, unused
chemicals?