Question 1: Which of the following best summarizes the main causes of water pollution today?
- increased runoff, driving, discarded oil
- evaporation, new construction, overpopulation
- waste from wildlife, decaying vegetation, automobiles
- leaking septic and sewer systems, manufacturing, farming
Question 2: When 5.6 grams of NaCl are dissolved in enough water to create a 125-gram solution, what is the solution's concentration, expressed as a percent by mass?
- 3.6% NaCl
- 3.8% NaCl
- 4.5% NaCl
- 4.7% NaCl
Question 3: On a potential energy diagram for the following processes, which of the following has a decrease in entropy?
- melting
- freezing
- boiling
- sublimation
Question 4: Which of the following is the salt in the Br nsted-Lowry neutralization reaction?
- HBr + NaHCO3 H2CO3 + NaBr
- HBr
- NaHCO3
- H2CO3
- NaBr
Question 5: Which of the following is not a result when a change to an equilibrium system is applied?
- Increasing the rate of the forward reaction will cause a shift to the left.
- Increasing the rate of the reverse reaction will cause a shift to the left.
- Decreasing the rate of the forward reaction will cause a shift to the left.
- Decreasing the rate of the reverse reaction will cause a shift to the right.