Question 1

-Which of the above would best describe how soap behaves in water?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) none of the above 
A) a 
B) b 
C) c 
D) d 
E) none of the above

Question 2

Why is secondary treatment often needed for sewage?

Accepted Answer

A) The dissolved organics are too high and lead to bacterial growth. 
B) The solution is contaminated with dangerous bacteria. 
C) There are too many dissolved inorganic compounds. 
D) There are too many finely divided particles that need to be filtered. 
E) none of the above 
A) The dissolved organics are too high and lead to bacterial growth. 
B) The solution is contaminated with dangerous bacteria. 
C) There are too many dissolved inorganic compounds. 
D) There are too many finely divided particles that need to be filtered. 
E) none of the above

Question 3

How would you classify the following material? coffee (black)

Accepted Answer

A) a suspension 
B) a heterogeneous mixture 
C) a solution 
D) an element 
E) a compound 
A) a suspension 
B) a heterogeneous mixture 
C) a solution 
D) an element 
E) a compound

Question 4

Which of the following might best describe the product obtained from soap and hard water (i.e.,soap scum)?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) none of the above 
A) a 
B) b 
C) c 
D) d 
E) none of the above

Question 5

Why is it significantly less costly to purify fresh water through reverse osmosis than to purify salt water through reverse osmosis?

Accepted Answer

A) The osmotic pressure exerted by fresh water is less. 
B) The osmotic pressure exerted by fresh water is greater. 
C) For non-coastal regions,the salt water needs to be transported many miles from the oceans. 
D) The expense of reverse osmosis is not dependent upon the salt concentration in the water. 
A) The osmotic pressure exerted by fresh water is less. 
B) The osmotic pressure exerted by fresh water is greater. 
C) For non-coastal regions,the salt water needs to be transported many miles from the oceans. 
D) The expense of reverse osmosis is not dependent upon the salt concentration in the water.

Question 6

How is the solubility of a solid affected by temperature?

Accepted Answer

A) As temperature goes up,the solubility goes up. 
B) As temperature goes down,the solubility goes down. 
C) As temperature goes up,the solubility goes down. 
D) As temperature goes down,the solubility goes up. 
E) both A and B 
A) As temperature goes up,the solubility goes up. 
B) As temperature goes down,the solubility goes down. 
C) As temperature goes up,the solubility goes down. 
D) As temperature goes down,the solubility goes up. 
E) both A and B

Question 7

-Which solute graphed above has a solubility in water that does not markedly increase with increasing temperature?

Accepted Answer

A) NaN $\mathrm { O } _ { 3 }$ 
B) LiCl 
C) KCl 
D) NaCl 
A) NaN $\mathrm { O } _ { 3 }$ 
B) LiCl 
C) KCl 
D) NaCl

Question 8

If the solubility of a compound is 72 grams per liter,how many grams of the compound will dissolve in 0.50 liters?

Accepted Answer

A) 36 g 
B) 72 g 
C) 144 g 
D) 30 g 
E) none of the above 
A) 36 g 
B) 72 g 
C) 144 g 
D) 30 g 
E) none of the above

Question 9

Allowing water to cascade or bubble in a fountain during the purification process is an example of

Accepted Answer

A) a gas dissolving in a liquid. 
B) a chemical reaction. 
C) ion exchange. 
D) a solid dissolving in a liquid. 
E) only a and b 
A) a gas dissolving in a liquid. 
B) a chemical reaction. 
C) ion exchange. 
D) a solid dissolving in a liquid. 
E) only a and b

Question 10

What do chicken noodle soup and garden soil have in common?

Accepted Answer

A) They are both examples of heterogeneous mixtures. 
B) They both contain elements. 
C) They are both examples of compounds. 
D) nothing 
A) They are both examples of heterogeneous mixtures. 
B) They both contain elements. 
C) They are both examples of compounds. 
D) nothing

Question 11

-At 10°C,which is more concentrated-a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ ,or a saturated solution of sodium chloride? (See figure shown above.)

Accepted Answer

A) At 20°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ ,is more concentrated than a saturated solution of sodium chloride,NaCl. 
B) At 10°C a saturated solution of sodium chloride,NaCl,is more concentrated than a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ . 
C) At 10°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ ,is more concentrated than a saturated solution of sodium chloride,NaCl. 
D) At 25°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ 
A) At 20°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ ,is more concentrated than a saturated solution of sodium chloride,NaCl. 
B) At 10°C a saturated solution of sodium chloride,NaCl,is more concentrated than a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ . 
C) At 10°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$ ,is more concentrated than a saturated solution of sodium chloride,NaCl. 
D) At 25°C a saturated solution of sodium nitrate,NaN $\mathrm { O } _ { 3 }$

Question 12

How many grams of sugar (sucrose)are there in 5 liters of sugar water that has a concentration of 0.5 grams per liter of solution?

Accepted Answer

A) 50 g 
B) 25 g 
C) 2.5 g 
D) 1.5 g 
A) 50 g 
B) 25 g 
C) 2.5 g 
D) 1.5 g

Question 13

What happens if you were to place a dilute solution that is in a bag made of a semipermeable membrane and were to then suspend it in a very concentrated solution?

Accepted Answer

A) The size of the suspended bag would decrease. 
B) The size of the suspended bag would increase. 
C) The size of the bag would not change. 
D) The solutions would eventually reach the same concentration. 
E) only c and d 
A) The size of the suspended bag would decrease. 
B) The size of the suspended bag would increase. 
C) The size of the bag would not change. 
D) The solutions would eventually reach the same concentration. 
E) only c and d

Question 14

Deuterium oxide, $\mathrm { D } _ { 2 }$ O,and water, $\mathrm { H } _ { 2 }$ O,have the same chemical structure and differ only in that $\mathrm { D } _ { 2 }$ O possesses the deuterium isotope of hydrogen,whereas water possesses the protium isotope.Deuterium oxide,also known as "heavy water," is 11 percent heavier than water.Might you expect its boiling temperature also to be about 11 percent greater? Why or why not?

Accepted Answer

A) The mass of the molecules has a far greater influence on the boiling temperature of the substance than does the polarity of the molecules,so $\mathrm { D } _ { 2 }$ O boils at a higher temperature. 
B) Since they have the same chemical structures,there is a similar molecular attraction between the molecules,so their boiling temperatures are similar. 
C) Since deuterium is radioactive,it breaks down more easily,so it has a lower boiling temperature than water. 
D) Since boiling temperature is a measure of the speed of a molecule,the heavier molecules move slower and thus have a higher boiling temperature. 
A) The mass of the molecules has a far greater influence on the boiling temperature of the substance than does the polarity of the molecules,so $\mathrm { D } _ { 2 }$ O boils at a higher temperature. 
B) Since they have the same chemical structures,there is a similar molecular attraction between the molecules,so their boiling temperatures are similar. 
C) Since deuterium is radioactive,it breaks down more easily,so it has a lower boiling temperature than water. 
D) Since boiling temperature is a measure of the speed of a molecule,the heavier molecules move slower and thus have a higher boiling temperature.

Question 15

What is the molarity of 0.5 liters of a solution with five moles of sucrose in it?

Accepted Answer

A) 10 molar 
B) 0.5 molar 
C) 5 molar 
D) 2.5 molar 
E) 1 molar 
A) 10 molar 
B) 0.5 molar 
C) 5 molar 
D) 2.5 molar 
E) 1 molar

Question 16

Why are noble gases infinitely soluble in noble gases?

Accepted Answer

A) The noble gases are attracted to each other by induced dipole-induced dipole attractions,but there is only one attraction per molecule. 
B) These are the smallest atoms on the periodic table. 
C) The molecules do not interact with each other,excluding other molecules. 
D) Noble gases can be mixed homogeneously in any proportion. 
A) The noble gases are attracted to each other by induced dipole-induced dipole attractions,but there is only one attraction per molecule. 
B) These are the smallest atoms on the periodic table. 
C) The molecules do not interact with each other,excluding other molecules. 
D) Noble gases can be mixed homogeneously in any proportion.

Question 17

Why are there few odors emanating from a properly managed composting toilet?

Accepted Answer

A) Tight seals prevent the escape of odors. 
B) Odors are absorbed by a layer of water. 
C) Decomposition is aerobic. 
D) The ventilation system steers odors through a carbon filter. 
A) Tight seals prevent the escape of odors. 
B) Odors are absorbed by a layer of water. 
C) Decomposition is aerobic. 
D) The ventilation system steers odors through a carbon filter.

Question 18

When blue food coloring is stirred into water,the result is a

Accepted Answer

A) homogeneous mixture called a solution. 
B) homogeneous mixture called a suspension. 
C) heterogeneous mixture called a solution. 
D) heterogeneous mixture called a suspension. 
E) pure liquid. 
A) homogeneous mixture called a solution. 
B) homogeneous mixture called a suspension. 
C) heterogeneous mixture called a solution. 
D) heterogeneous mixture called a suspension. 
E) pure liquid.

Question 19

Is the air in your house a homogeneous or heterogeneous mixture?

Accepted Answer

A) homogeneous because it is mixed very well 
B) heterogeneous because of the dust particles it contains 
C) homogeneous because it is all at the same temperature 
D) heterogeneous because it consists of different types of molecules 
A) homogeneous because it is mixed very well 
B) heterogeneous because of the dust particles it contains 
C) homogeneous because it is all at the same temperature 
D) heterogeneous because it consists of different types of molecules

Question 20

What is molarity?

Accepted Answer

A) the number of moles of solute per liter of solution 
B) the number of grams of solute per liter of solution 
C) the number of moles of solute per liter of solvent 
D) the number of liters of solute per mole of solution 
E) none of the above 
A) the number of moles of solute per liter of solution 
B) the number of grams of solute per liter of solution 
C) the number of moles of solute per liter of solvent 
D) the number of liters of solute per mole of solution 
E) none of the above

Exam 16: Mixtures

-Which of the above would best describe how soap behaves in water?

Why is secondary treatment often needed for sewage?

How would you classify the following material? coffee (black)

Which of the following might best describe the product obtained from soap and hard water (i.e.,soap scum)?

Why is it significantly less costly to purify fresh water through reverse osmosis than to purify salt water through reverse osmosis?

How is the solubility of a solid affected by temperature?

-Which solute graphed above has a solubility in water that does not markedly increase with increasing temperature?

If the solubility of a compound is 72 grams per liter,how many grams of the compound will dissolve in 0.50 liters?

Allowing water to cascade or bubble in a fountain during the purification process is an example of

What do chicken noodle soup and garden soil have in common?

-At 10°C,which is more concentrated-a saturated solution of sodium nitrate,NaN O3\mathrm { O } _ { 3 }O3​ ,or a saturated solution of sodium chloride? (See figure shown above.)

How many grams of sugar (sucrose)are there in 5 liters of sugar water that has a concentration of 0.5 grams per liter of solution?

What happens if you were to place a dilute solution that is in a bag made of a semipermeable membrane and were to then suspend it in a very concentrated solution?

What is the molarity of 0.5 liters of a solution with five moles of sucrose in it?

Why are noble gases infinitely soluble in noble gases?

Why are there few odors emanating from a properly managed composting toilet?

When blue food coloring is stirred into water,the result is a

Is the air in your house a homogeneous or heterogeneous mixture?

What is molarity?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

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