Question 1

Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by ________.

Accepted Answer

A) a physical change 
B) an oxidation-reduction reaction 
C) ion exchange 
D) filtering out the suspended arsenic particles 
E) only a and b 
A) a physical change 
B) an oxidation-reduction reaction 
C) ion exchange 
D) filtering out the suspended arsenic particles 
E) only a and b

Question 2

Describe what usually happens to a hot solution that is saturated with a solid as it cools.

Accepted Answer

A) The solid that is dissolved comes out of the solution completely. 
B) The solid stays in the solution. 
C) Some of the solid comes out of the solution. 
D) The solution freezes. 
E) The solution solidifies. 
A) The solid that is dissolved comes out of the solution completely. 
B) The solid stays in the solution. 
C) Some of the solid comes out of the solution. 
D) The solution freezes. 
E) The solution solidifies.

Question 3

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 4

Chlorine,   , is a gas at room temperature, but bromine,   , is a liquid. Explain.

Accepted Answer

A) Chlorine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. 
B) Bromine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. 
C) The smaller chlorine molecules are able to pack together in a tighter physical orientation. 
D) The bromine ions are held together by ionic bonds. 
A) Chlorine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. 
B) Bromine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. 
C) The smaller chlorine molecules are able to pack together in a tighter physical orientation. 
D) The bromine ions are held together by ionic bonds.

Question 5

What is a hydrogen bond?

Accepted Answer

A) a special type of dipole-dipole attraction involving hydrogen bound to a highly electronegative atom 
B) a special type of dipole-dipole attraction involving hydrogen bound to any other atom 
C) a special type of dipole-dipole attraction involving hydrogen bound to another hydrogen atom 
D) a special type of attraction involving any molecules that contain hydrogens 
E) none of the above 
A) a special type of dipole-dipole attraction involving hydrogen bound to a highly electronegative atom 
B) a special type of dipole-dipole attraction involving hydrogen bound to any other atom 
C) a special type of dipole-dipole attraction involving hydrogen bound to another hydrogen atom 
D) a special type of attraction involving any molecules that contain hydrogens 
E) none of the above

Question 6

Which of the following picture might best describe a soap or detergent?

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 7

Why is it important to conserve fresh water?

Accepted Answer

A) There is little fresh water available to us on our planet. 
B) As the human population grows, so does our need for fresh water. 
C) It is expensive to purify nonpotable water. 
D) all of the above 
A) There is little fresh water available to us on our planet. 
B) As the human population grows, so does our need for fresh water. 
C) It is expensive to purify nonpotable water. 
D) all of the above

Question 8

Which of the following solutions is the most concentrated?

Accepted Answer

A) 0.1 liter of water with 1 gram of sugar 
B) 2 liters of water with 0.2 gram of sugar 
C) 0.5 liter of water with 50 grams of sugar 
D) 3 liters of water with 30 grams of sugar 
E) They all have the same concentration. 
A) 0.1 liter of water with 1 gram of sugar 
B) 2 liters of water with 0.2 gram of sugar 
C) 0.5 liter of water with 50 grams of sugar 
D) 3 liters of water with 30 grams of sugar 
E) They all have the same concentration.

Question 9

Phosphate ions,   3-, were once added to detergents to assist in cleaning. What function did they serve?

Accepted Answer

A) Phosphate ions were relatively good at removing grease by binding with large nonpolar molecules. 
B) Phosphate ions were large enough to bind with the large grime molecules and remove them. 
C) Phosphate ions would bind to and remove calcium ions, thus acting as a water softening agent. 
D) Phosphate ions would reduce the growth of algae in aquatic habitats receiving the waste water. 
A) Phosphate ions were relatively good at removing grease by binding with large nonpolar molecules. 
B) Phosphate ions were large enough to bind with the large grime molecules and remove them. 
C) Phosphate ions would bind to and remove calcium ions, thus acting as a water softening agent. 
D) Phosphate ions would reduce the growth of algae in aquatic habitats receiving the waste water.

Question 10

How many grams of sugar (sucrose)are there in 5.0 liters of sugar water that has a concentration of 0.50 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 11

How many molecules of sucrose are in 0.500 L of a 1.00 molar solution of sucrose?

Accepted Answer

A) 3.01 × 1023 molecules of sucrose 
B) 6.02 × 1023 molecules of sucrose 
C) 12.04 × 1023 molecules of sucrose 
D) 0.5 
E) 1 gram 
A) 3.01 × 1023 molecules of sucrose 
B) 6.02 × 1023 molecules of sucrose 
C) 12.04 × 1023 molecules of sucrose 
D) 0.5 
E) 1 gram

Question 12

Why might a solvent like turpentine be better for removing grease and grime than water?

Accepted Answer

A) Like dissolves like. 
B) Oil and grease have similar interatomic forces as the turpentine and so are more soluble. 
C) Water is too polar and doesn't interact well with the nonpolar oils. 
D) Oil and grease have very limited solubility in the water. 
E) all of the above 
A) Like dissolves like. 
B) Oil and grease have similar interatomic forces as the turpentine and so are more soluble. 
C) Water is too polar and doesn't interact well with the nonpolar oils. 
D) Oil and grease have very limited solubility in the water. 
E) all of the above

Question 13

What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?

Accepted Answer

A) Both are similar, but one involves a temporary dipole created by a permanent dipole. 
B) Dipole-dipole interactions are weaker because the dipoles are permanent. 
C) Dipole-induced dipole interactions are stronger because the induced dipoles can be formed at any time. 
D) Both are identical. 
E) none of the above 
A) Both are similar, but one involves a temporary dipole created by a permanent dipole. 
B) Dipole-dipole interactions are weaker because the dipoles are permanent. 
C) Dipole-induced dipole interactions are stronger because the induced dipoles can be formed at any time. 
D) Both are identical. 
E) none of the above

Question 14

How many moles of water are there in 100. grams of water?

Accepted Answer

A) 1800 moles 
B) 100 moles 
C) 0.018 moles 
D) 5.55 moles 
A) 1800 moles 
B) 100 moles 
C) 0.018 moles 
D) 5.55 moles

Question 15

Deuterium oxide,   O, and water,   O, have the same chemical structure and differ only in that   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   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   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 16

Treating water with chlorine or ozone during water purification is an example of ________.

Accepted Answer

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

Question 17

Why is the surface area of a gecko's foot so extensive?

Accepted Answer

A) A gecko, like all amphibians, needs extensive surface area under foot for stability on land as well as mobility in water. 
B) A gecko's foot acts like a large dipole and thus allows for ion-dipole interaction in water. 
C) The greater the surface area the greater the number of induced dipole-induced dipole forces of attraction that can occur between the gecko's foot and the surface. 
D) The extensive surface area, once charged by the gecko's body, allows for the dipole-dipole attraction of every contact surface. 
A) A gecko, like all amphibians, needs extensive surface area under foot for stability on land as well as mobility in water. 
B) A gecko's foot acts like a large dipole and thus allows for ion-dipole interaction in water. 
C) The greater the surface area the greater the number of induced dipole-induced dipole forces of attraction that can occur between the gecko's foot and the surface. 
D) The extensive surface area, once charged by the gecko's body, allows for the dipole-dipole attraction of every contact surface.

Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by ________.

Describe what usually happens to a hot solution that is saturated with a solid as it cools.

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

Chlorine, , is a gas at room temperature, but bromine, , is a liquid. Explain.

What is a hydrogen bond?

Which of the following picture might best describe a soap or detergent?

Why is it important to conserve fresh water?

Which of the following solutions is the most concentrated?

Phosphate ions, ^3-, were once added to detergents to assist in cleaning. What function did they serve?

How many grams of sugar (sucrose)are there in 5.0 liters of sugar water that has a concentration of 0.50 grams per liter of solution?

How many molecules of sucrose are in 0.500 L of a 1.00 molar solution of sucrose?

Why might a solvent like turpentine be better for removing grease and grime than water?

What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?

How many moles of water are there in 100. grams of water?

Treating water with chlorine or ozone during water purification is an example of ________.

Why is the surface area of a gecko's foot so extensive?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

Exam 7: How Molecules Mix

Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by ________.

Describe what usually happens to a hot solution that is saturated with a solid as it cools.

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

Chlorine, , is a gas at room temperature, but bromine, , is a liquid. Explain.

What is a hydrogen bond?

Which of the following picture might best describe a soap or detergent?

Why is it important to conserve fresh water?

Which of the following solutions is the most concentrated?

Phosphate ions, 3-, were once added to detergents to assist in cleaning. What function did they serve?

How many grams of sugar (sucrose)are there in 5.0 liters of sugar water that has a concentration of 0.50 grams per liter of solution?

How many molecules of sucrose are in 0.500 L of a 1.00 molar solution of sucrose?

Why might a solvent like turpentine be better for removing grease and grime than water?

What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?

How many moles of water are there in 100. grams of water?

Treating water with chlorine or ozone during water purification is an example of ________.

Why is the surface area of a gecko's foot so extensive?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

Phosphate ions, ^3-, were once added to detergents to assist in cleaning. What function did they serve?