Page From a Student's Laboratory Notebook Step Notes Observation Carbonated beverages taste fizzier when they are warm than when they are cold. |(Carbonated beverages are fizzy because they contain dissolved carbon dioxide gas.) Hypothesis At higher temperatures, greater amounts of carbon dioxide gas will dissolve in a liquid. This is the same relationship between temperature and solubility seen with solids. Experiment Measure the mass of carbon dioxide (CO,) in different samples of the same carbonated beverage at different temperatures. Data analysis See graph below. Conclusion Mass of CO2 Dissolved in a Carbonated Beverage 0.30 3 0.25 0.20 0.15 0.10 5 10 15 20 25 Temperature (°C) Mass of CO, (g)
Use the table and graph below to answer Questions 2–6.
2. What must be a constant during the experiment?
A. temperature
B. mass of C O 2 dissolved in each sample
C. amount of beverage in each sample
D. independent variable
3. Assuming that all of the experimental data are correct,
what is a reasonable conclusion for this experiment?
A. Greater amounts of C O 2 dissolve in a liquid at
lower temperatures.
B. The different samples of beverage contained the
same amount of C O 2 at each temperature.
C. The relationship between temperature and
solubility seen with solids is the same as the
one seen with C O 2 .
D. C O 2 dissolves better at higher temperatures.
4. The scientific method used by this student showed
that
A. the hypothesis is supported by the experimental
data.
B. the observation accurately describes what occurs
in nature.
C. the experiment is poorly planned.
D. the hypothesis should be thrown out.
5. The independent variable in this experiment is
A. the number of samples tested.
B. the mass of C O 2 measured.
C. the type of beverage used.
D. the temperature of the beverage.
6. Which is an example of pure research?
A. creating synthetic elements to study their properties
B. producing heat-resistant plastics for use in
household ovens
C. finding ways to slow down the rusting of iron ships
D. searching for fuels other than gasoline to power cars
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