Reference no: EM13586359

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.