Chem I Mid-Term Exam

In what year did global CFC consumption drop most dramatically? Look at the graph.

• 1986
• 1987
• 1989
• 1996

What is the measurement of matter whose value depends on the force of gravity?

• mass
• volume
• energy
• weight

Chemists who study the chemistry of living organisms work in the field of ______________.

• biochemistry
• physical chemistry
• analytical chemistry
• theoretical chemistry

What is the name given to a set of controlled observations that test a proposed explanation?

• formula
• experiment
• conclusion
• theory

In the laboratory, one should NEVER _______.

• ask questions
• know how to contact help
• wear safety goggles
• perform experiments without the teacher's permission

A systematic approach used in scientific study is ___.

• theories
• Scientific Method
• qualitative analysis
• scientific law

A researcher is investigating the effect of different types of antacids on the prevention of stomach ulcers. The subjects were given the same food for 40 days. Which of the variables in this experiment is the independent variable?

• the type of food given to the subjects
• the antacids used
• the development of ulcers
• the length of the experiment

What is the temperature 51°C expressed in kelvins?

• 273.0 K
• 222 K
• 324 K
• 51 K

Use the conversion factor above to find the meters in 2.7 x 10 ³ kilometers.

• 2.7 x 10⁵ m
• 2.7 x 10⁻³ m
• 2.7 x 10⁶ m
• 2.7 m

How many significant figures will there be when the density value is calculated from the following data? mass = 24.47g; volume =13.2 mL

• 2
• 3
• 4
• 5