Question 1

Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that

Accepted Answer

A)  solution Y has no free hydrogen ions (H⁺) .
B)  the concentration of hydrogen ions in solution X is 30 times as great as the concentration of hydrogen ions in solution Y.
C)  the concentration of hydrogen ions in solution Y is 1,000 times as great as the concentration of hydrogen ions in solution X.
D)  the concentration of hydrogen ions in solution X is 3 times as great as the concentration of hydrogen ions in solution Y.
E)  None of the other answer choices correctly describes these solutions.

Question 2

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

Accepted Answer

A)  water's change in density when it condenses
B)  water's ability to dissolve molecules in the air
C)  the release of heat by the formation of hydrogen bonds
D)  the absorption of heat by the breaking of hydrogen bonds
E)  water's high surface tension

Question 3

Identical heat lamps are arranged to shine on identical containers of water and methanol (wood alcohol) , so that each liquid absorbs the same amount of energy minute by minute. The covalent bonds of methanol molecules are non-polar, so there are no hydrogen bonds among methanol molecules. Which of the following graphs correctly describes what will happen to the temperature of the water and the methanol?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 4

You have two beakers. One contains a solution of HCl at pH = 1.0. The other contains a solution of NaOH at pH = 13. Into a third beaker, you slowly and cautiously pour 20 mL of the HCL and 20 mL of the NaOH. After complete stirring, the pH of the mixture will be

Accepted Answer

A)  2.0.
B)  12.0.
C)  7.0.
D)  5.0.
E)  9.0.

Question 5

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. Respiring cells release CO₂. What prediction can we make about the pH of blood as that blood first comes in contact with respiring cells?

Accepted Answer

A)  Blood pH will decrease slightly.
B)  Blood pH will increase slightly.
C)  Blood pH will remain unchanged.
D)  Blood pH will first increase, then decrease as CO₂ combines with hemoglobin.
E)  Blood pH will first decrease, then increase sharply as CO₂ combines with hemoglobin.

Question 6

Hydrophobic substances such as vegetable oil are

Accepted Answer

A)  nonpolar substances that repel water molecules.
B)  nonpolar substances that have an attraction for water molecules.
C)  polar substances that repel water molecules.
D)  polar substances that have an affinity for water.
E)  charged molecules that hydrogen-bond with water molecules.

Exam 3: Water and the Fitness of the Environment

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

Correct Answer
verified

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. Respiring cells release CO₂. What prediction can we make about the pH of blood as that blood first comes in contact with respiring cells?

Correct Answer
verified

Correct Answer
verified

Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that

Correct Answer
verified

Hydrophobic substances such as vegetable oil are

Correct Answer
verified

You have two beakers. One contains a solution of HCl at pH = 1.0. The other contains a solution of NaOH at pH = 13. Into a third beaker, you slowly and cautiously pour 20 mL of the HCL and 20 mL of the NaOH. After complete stirring, the pH of the mixture will be

Correct Answer
verified

Exam 3: Water and the Fitness of the Environment

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

Correct AnswerverifiedShow Answer

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. Respiring cells release CO₂. What prediction can we make about the pH of blood as that blood first comes in contact with respiring cells?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that

Correct AnswerverifiedShow Answer

Hydrophobic substances such as vegetable oil are

Correct AnswerverifiedShow Answer

You have two beakers. One contains a solution of HCl at pH = 1.0. The other contains a solution of NaOH at pH = 13. Into a third beaker, you slowly and cautiously pour 20 mL of the HCL and 20 mL of the NaOH. After complete stirring, the pH of the mixture will be

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified