Question 1

When an ionic compound such as sodium chloride (NaCl)  is placed in water, the component atoms of the NaCl crystal dissociate into individual sodium ions (Na⁺)  and chloride ions (Cl⁻) . In contrast, the atoms of covalently bonded molecules (e.g., glucose, sucrose, glycerol)  do not generally dissociate when placed in aqueous solution. Which of the following solutions would be expected to contain the greatest number of solute particles (molecules or ions) ?

Accepted Answer

A)   1 liter of 0.5 M NaCl
B)   1 liter of 1.0 M NaCl
C)   1 liter of 1.0 M glucose
D)   1 liter of 1.0 M NaCl and 1 liter of 1.0 M glucose will contain equal numbers of solute particles.

Question 2

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

Accepted Answer

A)   
B)   
C)   
D)

Question 3

Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

Accepted Answer

A)   10⁻¹⁰ M
B)   10⁻⁴ M
C)   10⁻⁷ M
D)   10.0 M

Question 4

The molar mass of glucose is 180 grams per mole (g/mol) . Which of the following procedures should you carry out to make a 1 M solution of glucose? In 0.8 liter (L)  of water, dissolve ________.

Accepted Answer

A)   1 g of glucose, and then add more water until the total volume of the solution is 1 L
B)   18 g of glucose, and then add more water until the total volume of the solution is 1 L
C)   180 g of glucose, and then add 0.2 L more of water
D)   180 g of glucose, and then add more water until the total volume of the solution is 1 L

Question 5

How does 0.5 M sucrose (molecular mass 342)  solution compare to 0.5 M glucose (molecular mass 180)  solution?

Accepted Answer

A)   Both have 6.02 × 10²³ molecules.
B)   Sucrose has 171 molecules, whereas glucose has 90.
C)   Both have 3.01 × 10²³ molecules.
D)   Sucrose has 171 mg/L, whereas glucose has 90 mg/L.

Question 6

A dietary Calorie equals 1 kilocalorie. One kilocalorie equals ________.

Accepted Answer

A)   1000 calories, or the amount of heat required to raise the temperature of 1 g of water by 1°C
B)   10,000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1°F
C)   1000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1°C
D)   1000 calories, or the amount of heat required to raise the temperature of 100 g of water by 100°C

Question 7

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 12

Question 8

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Accepted Answer

A)   50°C
B)   5°C
C)   100°C
D)   10°C

Question 9

The cities of Portland, Oregon, and Minneapolis, Minnesota, are at about the same latitude, but Minneapolis has much hotter summers and much colder winters than Portland. Why?

Accepted Answer

A)   They are not at the same exact latitude.
B)   The ocean near Portland moderates the temperature.
C)   Fresh water is more likely to freeze than salt water.
D)   Minneapolis is much windier, due to its location in the middle of North America.

Question 10

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 neutralized by hydrogen atoms
D)   one of the hydrogen atoms donates an electron to the oxygen atom

Question 11

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.

Question 12

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)

Question 13

Thermal energy of the water in a bathtub is ________ than in a freshly brewed coffee pot because of its ________.

Accepted Answer

A)   higher; greater volume
B)   higher; high kinetic energy
C)   lower; low temperature
D)   lower; low density

Question 14

One mole (mol)  of glucose (molecular mass = 180 daltons)  is ________.

Accepted Answer

A)   180 × 10²³ molecules of glucose
B)   1 kilogram of glucose dissolved in 1 liter of solution
C)   180 mL of dissolved glucose
D)   180 grams of glucose

Question 15

Which of the following can be attributed to water's high specific heat?

Accepted Answer

A)   Oil and water do not mix well.
B)   A lake heats up more slowly than the air around it.
C)   Ice floats on water.
D)   Sugar dissolves in hot tea faster than in iced tea.

Exam 3: Water and Life

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

Correct Answer
verified

How does 0.5 M sucrose (molecular mass 342) solution compare to 0.5 M glucose (molecular mass 180) solution?

Correct Answer
verified

A dietary Calorie equals 1 kilocalorie. One kilocalorie equals ________.

Correct Answer
verified

Thermal energy of the water in a bathtub is than in a freshly brewed coffee pot because of its .

Correct Answer
verified

One mole (mol) of glucose (molecular mass = 180 daltons) is ________.

Correct Answer
verified

Which of the following can be attributed to water's high specific heat?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Correct Answer
verified

The molar mass of glucose is 180 grams per mole (g/mol) . Which of the following procedures should you carry out to make a 1 M solution of glucose? In 0.8 liter (L) of water, dissolve ________.

Correct Answer
verified

The cities of Portland, Oregon, and Minneapolis, Minnesota, are at about the same latitude, but Minneapolis has much hotter summers and much colder winters than Portland. Why?

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

Correct AnswerverifiedShow Answer

How does 0.5 M sucrose (molecular mass 342) solution compare to 0.5 M glucose (molecular mass 180) solution?

Correct AnswerverifiedShow Answer

A dietary Calorie equals 1 kilocalorie. One kilocalorie equals ________.

Correct AnswerverifiedShow Answer

Thermal energy of the water in a bathtub is ________ than in a freshly brewed coffee pot because of its ________.

Correct AnswerverifiedShow Answer

One mole (mol) of glucose (molecular mass = 180 daltons) is ________.

Correct AnswerverifiedShow Answer

Which of the following can be attributed to water's high specific heat?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Correct AnswerverifiedShow Answer

The molar mass of glucose is 180 grams per mole (g/mol) . Which of the following procedures should you carry out to make a 1 M solution of glucose? In 0.8 liter (L) of water, dissolve ________.

Correct AnswerverifiedShow Answer

The cities of Portland, Oregon, and Minneapolis, Minnesota, are at about the same latitude, but Minneapolis has much hotter summers and much colder winters than Portland. Why?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Thermal energy of the water in a bathtub is than in a freshly brewed coffee pot because of its .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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