Which sequence should be followed when conducting a laboratory investigation?
a. Gather data, make observations, form a conclusion, form a hypothesis
b. Define a problem, form a hypothesis, gather data, form a conclusion
c. Form a hypothesis, form a conclusion, gather data, define a problem
d. Make observations, gather data, form a conclusion, state a problem
Which of the following are direct products of the use of hydrocarbon fuels in automobile engines?
(A) O, N, and CO
(B) CO, Ar, and O
(C) CO2, H2O, and O3
(D) CO2, O3, and Pb
(E) CO2, NOX, and VOCs
Burning one gallon of gasoline in a car releases approximately 20 pounds of CO2 into the atmosphere. One person drives 60,000 miles in a car that averages 30 miles per gallon (mpg), while another person drives 60,000 miles in a car that averages 20 mpg. Over the course of the 60,000 miles, how many fewer pounds of CO2 are released by the 30 mpg car than by the 20 mpg car?