Question 1

As the [H3O+] of the solution decreases, the [OH-] ________.

Accepted Answer

A)   increases and thus pH increases
B)   increases and thus pH decreases
C)   decreases and thus the pH decreases
D)   decreases and thus the pH increasesE) C) and D)
F) All of the above

Question 2

Consider the following reaction at equilibrium: CO₂ + H₂O  H₂CO₃. What would be the effect of adding additional H₂O?

Accepted Answer

A)   It would drive the equilibrium dynamics to the right.
B)   It would drive the equilibrium dynamics to the left.
C)   Nothing would happen because the reactants and products are in equilibrium.
D)   Reactions in both the directions will slow down.E) B) and D)
F) All of the above

Question 3

Identical heat lamps are arranged to shine on two identical containers, one containing water and one methanol (wood alcohol) , so that each liquid absorbs the same amount of energy minute by minute. The covalent bonds of methanol molecules are nonpolar, 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) A) and B)
F) B) and C)

Question 4

Carbon dioxide (CO₂)  is readily soluble in water, according to the equation CO₂ + H₂O ↔ H₂CO₃. Carbonic acid (H₂CO₃)  is a weak acid. If CO₂ is bubbled into a beaker containing pure, freshly distilled water, which of the following graphs correctly describes the results?

Accepted Answer

A)  
B)  
C)  
D)  E) A) and B)
F) C) and D)

Question 5

Water has many exceptional and useful properties. Which is the rarest property among compounds?

Accepted Answer

A)   Water is a solvent.
B)   Solid water is less dense than liquid water.
C)   Water has a high heat capacity.
D)   Water has surface tension.E) B) and C)
F) None of the above

Question 6

Sulphur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H₂S will ________.

Accepted Answer

A)   have greater cohesion to other molecules of H₂S
B)   have a greater tendency to form hydrogen bonds with each other
C)   have a higher capacity to absorb heat for the same change in temperature
D)   not form hydrogen bonds with each otherE) C) and D)
F) All of the above

Question 7

How many grams of the compound in the figure are required to make 1 litre of a 0.5 M solution? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen and 16 for oxygen.)

Accepted Answer

A)   30
B)   60
C)   90
D)   120E) A) and B)
F) None of the above

Question 8

A solution contains 0.0000001 (10-7)  moles of hydrogen ions [H⁺] per litre. Which of the following best describes this solution?

Accepted Answer

A)   acidic: H⁺ acceptor
B)   basic: H⁺ acceptor
C)   acidic: H⁺ donor
D)   neutralE) A) and B)
F) B) and C)

Question 9

Based on your knowledge of the polarity of water molecules, the solute molecule depicted is most likely ________.

Accepted Answer

A)   positively charged
B)   negatively charged
C)   without charge
D)   nonpolarE) A) and C)
F) C) and D)

Question 10

Melting of ice and thus reduced feeding opportunities for polar bears is occurring because of the ________.

Accepted Answer

A)   increase in phytoplankton population
B)   drying up of rivers and streams
C)   constant breaking and reforming of hydrogen bonds in water
D)   increase in CO₂ and other greenhouse gases in the atmosphereE) B) and C)
F) All of the above

Question 11

Geraldton, Morowa and Mount Magnet in Western Australia are at about the same latitude, but Mount Magnet has much hotter summers and much colder winters than Geraldton. Why?

Accepted Answer

A)   They are not at the same exact latitude.
B)   The ocean near Geraldton moderates the temperature.
C)   Fresh water is more likely to freeze than salt water.
D)   Mount Magnet is much windier, due to its location in Western Australia.E) A) and B)
F) A) and C)

Question 12

Which of the following is a hydrophobic material?

Accepted Answer

A)   paper
B)   table salt
C)   wax
D)   sugarE) C) and D)
F) A) and C)

Question 13

Which of the following effects can occur because of the high surface tension of water?

Accepted Answer

A)   Rivers cannot freeze solid in winter, despite low temperatures.
B)   Spiders can walk across the surface of a small pond.
C)   Organisms can resist temperature changes, although they give off heat due to chemical reactions.
D)   Sweat can evaporate from the skin, helping to keep people from overheating.E) B) and D)
F) A) and C)

Question 14

Which of the following graphs describes the relationship between [H3O+] and pH?

Accepted Answer

A)  3O+] and pH? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)  3O+] and pH? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)  3O+] and pH? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)  3O+] and pH? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) B) and D)
F) C) and D)

Question 15

How would acidification of seawater affect marine organisms? Acidification of seawater would ________.

Accepted Answer

A)   increase dissolved carbonate concentrations and promote faster growth of corals and shell-building animals
B)   decrease dissolved carbonate concentrations and promote faster growth of corals and shell-building animals
C)   increase dissolved carbonate concentrations and hinder growth of corals and shell-building animals
D)   decrease dissolved carbonate concentrations and hinder growth of corals and shell-building animalsE) C) and D)
F) B) and D)

Question 16

Rank, from low to high, the pH of blood, stomach acid, and urine.

Accepted Answer

A)   blood, urine, and stomach acid
B)   stomach acid, blood, and urine
C)   urine, blood, stomach acid
D)   stomach acid, urine, bloodE) A) and C)
F) B) and C)

Question 17

The partial negative charge in a molecule of water occurs because ________.

Accepted Answer

A)   the oxygen atom donates an electron to each of the hydrogen atoms
B)   the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus
C)   the oxygen atom has two pairs of electrons in its valence shell that are not neutralised by hydrogen atoms
D)   one of the hydrogen atoms donates an electron to the oxygen atomE) A) and D)
F) B) and D)

Question 18

Cohesion, surface tension, and adhesion are the properties of water molecules that ________.

Accepted Answer

A)   increase when temperature increases
B)   increase when pH increases
C)   are a result of hydrogen bonding
D)   are a result of polar covalent bondingE) A) and D)
F) A) and C)

Question 19

If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H⁺ ions ________.

Accepted Answer

A)   is 10 times higher in the cytoplasm than in the mitochondrial matrix
B)   is 10 times higher in the mitochondrial matrix than in the cytoplasm
C)   in the cytoplasm is 7/8 the concentration in the mitochondrial matrix
D)   in the cytoplasm is 8/7 the concentration in the mitochondrial matrixE) A) and B)
F) A) and C)

Question 20

What is the pH of a solution with a hydroxyl ion (OH-)  concentration of 10-10 M?

Accepted Answer

A)   pH 2
B)   pH 4
C)   pH 10
D)   pH 12E) C) and D)
F) A) and C)

Exam 3: Water and Life

Cohesion, surface tension, and adhesion are the properties of water molecules that ________.

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. If CO₂ is bubbled into a beaker containing pure, freshly distilled water, which of the following graphs correctly describes the results?

Correct Answer
verified

As the [H₃O⁺] of the solution decreases, the [OH^-] ________.

Correct Answer
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A solution contains 0.0000001 (10-7) moles of hydrogen ions [H⁺] per litre. Which of the following best describes this solution?

Correct Answer
verified

Which of the following is a hydrophobic material?

Correct Answer
verified

Which of the following effects can occur because of the high surface tension of water?

Correct Answer
verified

How many grams of the compound in the figure are required to make 1 litre of a 0.5 M solution? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen and 16 for oxygen.)

Correct Answer
verified

If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H⁺ ions ________.

Correct Answer
verified

Correct Answer
verified

Which of the following graphs describes the relationship between [H₃O⁺] and pH?

Correct Answer
verified

Rank, from low to high, the pH of blood, stomach acid, and urine.

Correct Answer
verified

What is the pH of a solution with a hydroxyl ion (OH-) concentration of 10-10 M?

Correct Answer
verified

Geraldton, Morowa and Mount Magnet in Western Australia are at about the same latitude, but Mount Magnet has much hotter summers and much colder winters than Geraldton. Why?

Correct Answer
verified

Melting of ice and thus reduced feeding opportunities for polar bears is occurring because of the ________.

Correct Answer
verified

Based on your knowledge of the polarity of water molecules, the solute molecule depicted is most likely ________.

Correct Answer
verified

The partial negative charge in a molecule of water occurs because ________.

Correct Answer
verified

Sulphur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H₂S will ________.

Correct Answer
verified

Consider the following reaction at equilibrium: CO₂ + H₂O H₂CO₃. What would be the effect of adding additional H₂O?

Correct Answer
verified

How would acidification of seawater affect marine organisms? Acidification of seawater would ________.

Correct Answer
verified

Water has many exceptional and useful properties. Which is the rarest property among compounds?

Correct Answer
verified

Exam 3: Water and Life

Cohesion, surface tension, and adhesion are the properties of water molecules that ________.

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. If CO₂ is bubbled into a beaker containing pure, freshly distilled water, which of the following graphs correctly describes the results?

Correct AnswerverifiedShow Answer

As the [H3O+] of the solution decreases, the [OH-] ________.

Correct AnswerverifiedShow Answer

A solution contains 0.0000001 (10-7) moles of hydrogen ions [H⁺] per litre. Which of the following best describes this solution?

Correct AnswerverifiedShow Answer

Which of the following is a hydrophobic material?

Correct AnswerverifiedShow Answer

Which of the following effects can occur because of the high surface tension of water?

Correct AnswerverifiedShow Answer

How many grams of the compound in the figure are required to make 1 litre of a 0.5 M solution? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen and 16 for oxygen.)

Correct AnswerverifiedShow Answer

If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H⁺ ions ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following graphs describes the relationship between [H3O+] and pH?

Correct AnswerverifiedShow Answer

Rank, from low to high, the pH of blood, stomach acid, and urine.

Correct AnswerverifiedShow Answer

What is the pH of a solution with a hydroxyl ion (OH-) concentration of 10-10 M?

Correct AnswerverifiedShow Answer

Geraldton, Morowa and Mount Magnet in Western Australia are at about the same latitude, but Mount Magnet has much hotter summers and much colder winters than Geraldton. Why?

Correct AnswerverifiedShow Answer

Melting of ice and thus reduced feeding opportunities for polar bears is occurring because of the ________.

Correct AnswerverifiedShow Answer

Based on your knowledge of the polarity of water molecules, the solute molecule depicted is most likely ________.

Correct AnswerverifiedShow Answer

The partial negative charge in a molecule of water occurs because ________.

Correct AnswerverifiedShow Answer

Sulphur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H₂S will ________.

Correct AnswerverifiedShow Answer

Consider the following reaction at equilibrium: CO₂ + H₂O H₂CO₃. What would be the effect of adding additional H₂O?

Correct AnswerverifiedShow Answer

How would acidification of seawater affect marine organisms? Acidification of seawater would ________.

Correct AnswerverifiedShow Answer

Water has many exceptional and useful properties. Which is the rarest property among compounds?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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As the [H₃O⁺] of the solution decreases, the [OH^-] ________.

Correct Answer
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Which of the following graphs describes the relationship between [H₃O⁺] and pH?

Correct Answer
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