Question 1

What is the sum of the atomic masses of all the atoms in sucrose, C12H22O11 ?

Accepted Answer

A) 342 amu 
B) 182 amu 
C) 270 amu 
D) none of the above 
A) 342 amu 
B) 182 amu 
C) 270 amu 
D) none of the above

Question 2

What is the purpose of treating water with chlorine gas or ozone during water purification?

Accepted Answer

A) to kill bacteria 
B) to improve taste 
C) to improve color 
D) to remove solids 
E) none of the above 
A) to kill bacteria 
B) to improve taste 
C) to improve color 
D) to remove solids 
E) none of the above

Question 3

Which of the following is a mixture?

Accepted Answer

A) air 
B) gold 
C) salt 
D) iron 
E) helium 
A) air 
B) gold 
C) salt 
D) iron 
E) helium

Question 4

Which has the most atoms?

Accepted Answer

A) a mole of gold 
B) a mole of helium 
C) a mole of lead 
D) All of the above have the same number of atoms. 
E) none of the above 
A) a mole of gold 
B) a mole of helium 
C) a mole of lead 
D) All of the above have the same number of atoms. 
E) none of the above

Question 5

How many molecules of sucrose are in 0.5 L of a 2 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 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

Which of the following material phases cannot form a solution?

Accepted Answer

A) solids 
B) liquids 
C) gases 
D) All of the above can form solutions. 
E) None of the above can form solutions. 
A) solids 
B) liquids 
C) gases 
D) All of the above can form solutions. 
E) None of the above can form solutions.

Question 8

The following image represents which kind of matter?

Accepted Answer

A) a mixture 
B) a compound 
C) an element 
D) none of the above 
E) all of the above 
A) a mixture 
B) a compound 
C) an element 
D) none of the above 
E) all of the above

Question 9

How many moles of sugar,C12H22O11,are there in 200.grams?

Accepted Answer

A) 0.585 moles 
B) 68,400 moles 
C) 1.71 moles 
D) 0.684 moles 
A) 0.585 moles 
B) 68,400 moles 
C) 1.71 moles 
D) 0.684 moles

Question 10

Fish don't live very long in water that has just been boiled and brought back to room temperature.Suggest why.

Accepted Answer

A) There is now a higher concentration of dissolved C $\mathrm { O } _ { 2 }$ in the water. 
B) The nutrients in the water have been destroyed. 
C) Since some of the water was evaporated while boiling,the salts in the water are now more concentrated.This has a negative effect on the fish. 
D) The boiling process removes the air that was dissolved in the water.Upon cooling the water is void of its usual air content,hence,the fish drown. 
A) There is now a higher concentration of dissolved C $\mathrm { O } _ { 2 }$ in the water. 
B) The nutrients in the water have been destroyed. 
C) Since some of the water was evaporated while boiling,the salts in the water are now more concentrated.This has a negative effect on the fish. 
D) The boiling process removes the air that was dissolved in the water.Upon cooling the water is void of its usual air content,hence,the fish drown.

Question 11

What makes a semipermeable membrane selective for one chemical species but not another?

Accepted Answer

A) The pores in the membrane select by size,they are big enough for water only. 
B) The material is hydrophilic and therefore only allows water through. 
C) The material is hydrophobic and therefore only allows water through. 
D) The material chemically reacts with everything but water. 
E) none of the above 
A) The pores in the membrane select by size,they are big enough for water only. 
B) The material is hydrophilic and therefore only allows water through. 
C) The material is hydrophobic and therefore only allows water through. 
D) The material chemically reacts with everything but water. 
E) none of the above

Question 12

Which of the following would be considered a homogeneous mixture?

Accepted Answer

A) wine 
B) hydrogen cyanide 
C) rusty iron 
D) pretzel 
E) sugar 
A) wine 
B) hydrogen cyanide 
C) rusty iron 
D) pretzel 
E) sugar

Question 13

What is the difference between a compound and a mixture?

Accepted Answer

A) A mixture can be physically separated into its components; a compound cannot be physically separated into its components. 
B) A compound can be physically separated into its components; a mixture cannot be physically separated into its components. 
C) A compound is just a mixture of elements. 
D) The components of a mixture do not have the same properties individually as they do when mixed. 
E) The components of a compound have the same properties individually as they do when mixed. 
A) A mixture can be physically separated into its components; a compound cannot be physically separated into its components. 
B) A compound can be physically separated into its components; a mixture cannot be physically separated into its components. 
C) A compound is just a mixture of elements. 
D) The components of a mixture do not have the same properties individually as they do when mixed. 
E) The components of a compound have the same properties individually as they do when mixed.

Question 14

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 15

When you set a pot of tap water on the stove to boil,you'll often see bubbles start to form well before boiling temperature is ever reached.Explain this observation.

Accepted Answer

A) These are dissolved salts heating up and escaping from the water. 
B) These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. 
C) They are very minute pockets of water in the gaseous phase.When they get large enough,the water will boil as this gas escapes. 
D) These initial bubbles are the gases that were dissolved in the water coming out of solution.The solubility of gases in water decreases with increasing temperature. 
A) These are dissolved salts heating up and escaping from the water. 
B) These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. 
C) They are very minute pockets of water in the gaseous phase.When they get large enough,the water will boil as this gas escapes. 
D) These initial bubbles are the gases that were dissolved in the water coming out of solution.The solubility of gases in water decreases with increasing temperature.

Question 16

What is the purpose of adding aluminum salts and a base to water during water treatment?

Accepted Answer

A) The two together gel and trap dirt and bacteria. 
B) The higher pH kills bacteria. 
C) The aluminum removes the rust taste from the water. 
D) The base dissolves the dirt. 
E) It improves the taste. 
A) The two together gel and trap dirt and bacteria. 
B) The higher pH kills bacteria. 
C) The aluminum removes the rust taste from the water. 
D) The base dissolves the dirt. 
E) It improves the taste.

Question 17

Why do hot water heaters lose their efficiency quicker in households with hard water?

Accepted Answer

A) The hard water calcium and magnesium ions corrode the heating element. 
B) The hard water calcium carbonate deposits oxidize the inner tank wall. 
C) The calcium carbonate on the inner surface of the hot water tank builds up to the point that it insulates the water from the heating element. 
D) The hard water calcium ions exchange with iron ions from the inner metal wall which react with the water heater base to form rust and deteriorate the bottom of the tank. 
A) The hard water calcium and magnesium ions corrode the heating element. 
B) The hard water calcium carbonate deposits oxidize the inner tank wall. 
C) The calcium carbonate on the inner surface of the hot water tank builds up to the point that it insulates the water from the heating element. 
D) The hard water calcium ions exchange with iron ions from the inner metal wall which react with the water heater base to form rust and deteriorate the bottom of the tank.

Question 18

Does the concentration of chlorine in drinking water tend to increase or decrease as it leaves the water treatment plant and disperses into the community? Why?

Accepted Answer

A) Increases.As the chlorine reacts with the bacteria in the water,more chlorine is produced. 
B) Increases.As the water evaporates the chlorine concentration would increase in the remaining water. 
C) Decreases.Evaporative processes and reaction with organic bacteria would decrease the chlorine concentration. 
D) Neither.The chlorine concentration in the water does not vary as the water is dispersed into the community. 
A) Increases.As the chlorine reacts with the bacteria in the water,more chlorine is produced. 
B) Increases.As the water evaporates the chlorine concentration would increase in the remaining water. 
C) Decreases.Evaporative processes and reaction with organic bacteria would decrease the chlorine concentration. 
D) Neither.The chlorine concentration in the water does not vary as the water is dispersed into the community.

Question 19

Would you expect to find more dissolved oxygen in polar or tropical ocean waters? Why?

Accepted Answer

A) There would be more dissolved oxygen in the tropical oceans because intense tropical storms mix up the atmospheric oxygen into the ocean water. 
B) There would be more dissolved oxygen in the polar oceans because the colder oxygen would "sink" and dissolve into the water. 
C) There would be more dissolved oxygen in the tropical oceans because the heated oxygen molecules in the air would collide with and mix into the water. 
D) There would be more dissolved oxygen in the polar oceans because the solubility of oxygen in water decreases with increasing temperature. 
A) There would be more dissolved oxygen in the tropical oceans because intense tropical storms mix up the atmospheric oxygen into the ocean water. 
B) There would be more dissolved oxygen in the polar oceans because the colder oxygen would "sink" and dissolve into the water. 
C) There would be more dissolved oxygen in the tropical oceans because the heated oxygen molecules in the air would collide with and mix into the water. 
D) There would be more dissolved oxygen in the polar oceans because the solubility of oxygen in water decreases with increasing temperature.

Question 20

Red blood cells have a high concentration of dissolved ions.When placed into pure water they rupture.Why?

Accepted Answer

A) Osmosis draws water into the cell until it pops. 
B) Water dissolves the cell membrane. 
C) Osmosis draws water out of the cell until it tears. 
D) The cells are not stable outside of a biological host. 
E) none of the above 
A) Osmosis draws water into the cell until it pops. 
B) Water dissolves the cell membrane. 
C) Osmosis draws water out of the cell until it tears. 
D) The cells are not stable outside of a biological host. 
E) none of the above

Exam 16: Mixtures

What is the sum of the atomic masses of all the atoms in sucrose, C12H22O11 ?

What is the purpose of treating water with chlorine gas or ozone during water purification?

Which of the following is a mixture?

Which has the most atoms?

How many molecules of sucrose are in 0.5 L of a 2 molar solution of sucrose?

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

Which of the following material phases cannot form a solution?

The following image represents which kind of matter?

How many moles of sugar,C12H22O11,are there in 200.grams?

Fish don't live very long in water that has just been boiled and brought back to room temperature.Suggest why.

What makes a semipermeable membrane selective for one chemical species but not another?

Which of the following would be considered a homogeneous mixture?

What is the difference between a compound and a mixture?

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

When you set a pot of tap water on the stove to boil,you'll often see bubbles start to form well before boiling temperature is ever reached.Explain this observation.

What is the purpose of adding aluminum salts and a base to water during water treatment?

Why do hot water heaters lose their efficiency quicker in households with hard water?

Does the concentration of chlorine in drinking water tend to increase or decrease as it leaves the water treatment plant and disperses into the community? Why?

Would you expect to find more dissolved oxygen in polar or tropical ocean waters? Why?

Red blood cells have a high concentration of dissolved ions.When placed into pure water they rupture.Why?

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

Filters

What is the sum of the atomic masses of all the atoms in sucrose, C₁₂H₂₂O₁₁ ?

How many moles of sugar,C₁₂H₂₂O₁₁,are there in 200.grams?