Answers to Introduction to Chemistry Practice Problems:
1. Identify each type of investigation as an example of pure research or applied research.
a. A researcher analyzes the composition of Saturn’s atmosphere. Pure research
b. A researcher improves the fuel efficiency of a combustion engine. Applied research
c. A researcher works on ways to improve the agricultural yield of an acre of corn Applied research
d.A researcher examines the unique crystalline structure of snowflakes. Pure research
2. Match each activity to one of the five areas of chemistry. (Organic, inorganic, biochemistry, physical, analytical)
a. Determining the energy transferred when water reaches the boiling point Physical
b.Finding out how much water vapor is in a sample of air Analytical
c. Studying the conversion of light energy into chemical energy during photosynthesis
in plants Biochemistry
d. Manufacturing polyester, which contains carbon Organic
e. Studying crystals of the mineral quartz Inorganic
f. Performing quality control during the manufacturing of Advil Analytical
g. Explaining how the speed of a reaction can be increased by adding a catalyst Physical
h. Studying the clotting mechanism of blood Biochemistry
3. Identify each piece of data as either qualitative (descriptive) or quantitative (numerical).
a. Blue Qualitative
b. 150 pound Quantitative
c. 110° C Quantitative
d. Round Qualitative
e. Smells like roses Qualitative
f. 35 mph Quantitative
g. Hot Qualitative