Question 1

Which of the following is an example of a chemical change?

Accepted Answer

A) gasoline being used in the engine of a car producing exhaust 
B) water freezing into ice crystals 
C) aftershave or perfume on your skin generating a smell 
D) a piece of metal expanding when heated, but returning to original size when cooled 
E) breaking a glass window 
A) gasoline being used in the engine of a car producing exhaust 
B) water freezing into ice crystals 
C) aftershave or perfume on your skin generating a smell 
D) a piece of metal expanding when heated, but returning to original size when cooled 
E) breaking a glass window

Question 2

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that

Accepted Answer

A) the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. 
B) on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules. 
C) anything that a chemist can see, touch, hear, smell, or taste is an illusion. 
D) elements are made up of only three basic types of matter. 
A) the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. 
B) on the submicroscopic level, chemist's find that matter is made of extremely small particles, such as atoms and molecules. 
C) anything that a chemist can see, touch, hear, smell, or taste is an illusion. 
D) elements are made up of only three basic types of matter.

Question 3

What chemical change occurs when a wax candle burns?

Accepted Answer

A) The wax near the flame melts. 
B) The molten wax is pulled upwards through the wick. 
C) The wax within the wick is heated to about 600°C. 
D) The heated wax molecules combine with oxygen molecules. 
A) The wax near the flame melts. 
B) The molten wax is pulled upwards through the wick. 
C) The wax within the wick is heated to about 600°C. 
D) The heated wax molecules combine with oxygen molecules.

Question 4

Each night you measure your height just before going to bed. When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were the night before but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change?

Accepted Answer

A) chemical change because it involves your body 
B) physical change because it readily reverses 
C) chemical change because it involves changes in your bone structure 
D) physical change because water expands as it freezes 
A) chemical change because it involves your body 
B) physical change because it readily reverses 
C) chemical change because it involves changes in your bone structure 
D) physical change because water expands as it freezes

Question 5

How many different elements are in the compound C6H12O6?

Accepted Answer

A) 3 
B) 6 
C) 24 
D) All of the elements are the same. 
A) 3 
B) 6 
C) 24 
D) All of the elements are the same.

Question 6

If you have two molecules of TiO2, how many oxygen atoms would you have?

Accepted Answer

A) 4 
B) 2 
C) 3 
D) 6 
E) none 
A) 4 
B) 2 
C) 3 
D) 6 
E) none

Question 7

Which of the following is an example of a physical change?

Accepted Answer

A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash 
A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash

Question 8

Which of the following is not a chemical change?

Accepted Answer

A) a rock being crushed to powder 
B) grass growing 
C) grape juice turning into wine 
D) a loaf of bread growing mold 
E) wood burning to ash 
A) a rock being crushed to powder 
B) grass growing 
C) grape juice turning into wine 
D) a loaf of bread growing mold 
E) wood burning to ash

Question 9

Which statement best describes a compound?

Accepted Answer

A) a material that is made up of a combination of atoms bonded together 
B) a mixture of more than one element 
C) a mixture of atoms 
D) a material that is made up of a single type of atom 
E) none of the above 
A) a material that is made up of a combination of atoms bonded together 
B) a mixture of more than one element 
C) a mixture of atoms 
D) a material that is made up of a single type of atom 
E) none of the above

Question 10

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

Accepted Answer

A) molecule A because it is the first to transform into a liquid 
B) molecule B because it is first to transform into a liquid 
C) molecule A because it remains in the gaseous phase 
D) molecule B because it remains in the gaseous phase 
A) molecule A because it is the first to transform into a liquid 
B) molecule B because it is first to transform into a liquid 
C) molecule A because it remains in the gaseous phase 
D) molecule B because it remains in the gaseous phase

Question 11

Which of the following would be considered a chemical property?

Accepted Answer

A) reactivity towards water 
B) melting temperature 
C) boiling temperature 
D) conductivity 
E) flexibility 
A) reactivity towards water 
B) melting temperature 
C) boiling temperature 
D) conductivity 
E) flexibility

Question 12

How many atoms are in one molecule of Na2SO4?

Accepted Answer

A) 7 
B) 2 
C) 4 
D) 3 
E) 24 
A) 7 
B) 2 
C) 4 
D) 3 
E) 24

Question 13

Which of the following would be considered a physical property?

Accepted Answer

A) density 
B) flammability 
C) corrosion resistance 
D) reactivity towards acid 
E) oxygen sensitivity 
A) density 
B) flammability 
C) corrosion resistance 
D) reactivity towards acid 
E) oxygen sensitivity

Question 14

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C. Which of the following statements is true?

Accepted Answer

A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above 
A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above

Question 15

Which of the following boxes represents a compound?       A B C

Accepted Answer

A) only A 
B) only B 
C) only C 
D) both A and C 
A) only A 
B) only B 
C) only C 
D) both A and C

Question 16

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?

Accepted Answer

A) Yes, and this explains how fish are able to breathe water. 
B) Yes, but that their properties are similar is only a coincidence. 
C) No, but their similar properties are only a coincidence. 
D) No, compounds are uniquely different from the elements from which they're made. 
A) Yes, and this explains how fish are able to breathe water. 
B) Yes, but that their properties are similar is only a coincidence. 
C) No, but their similar properties are only a coincidence. 
D) No, compounds are uniquely different from the elements from which they're made.

Question 17

Of the three sciences, physics, chemistry, and biology, the most complex is

Accepted Answer

A) physics because it involves many mathematical equations. 
B) chemistry because there are so many possible combinations of atoms. 
C) biology because it is based upon both the laws of chemistry and physics. 
D) All three of these sciences are equally complex. 
A) physics because it involves many mathematical equations. 
B) chemistry because there are so many possible combinations of atoms. 
C) biology because it is based upon both the laws of chemistry and physics. 
D) All three of these sciences are equally complex.

Question 18

Is aging primarily an example of a physical or chemical change?

Accepted Answer

A) Aging is an example of a physical change since it involves our physical bodies getting older each day. 
B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules. 
C) Aging cannot be classified as either a physical or chemical change. 
D) None of the above is true. 
A) Aging is an example of a physical change since it involves our physical bodies getting older each day. 
B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules. 
C) Aging cannot be classified as either a physical or chemical change. 
D) None of the above is true.

Question 19

What is the name of the following compound? CaCl2

Accepted Answer

A) calcium chloride 
B) carbon chloride 
C) dichlorocalcium 
D) calc two 
E) dicalcium chloride 
A) calcium chloride 
B) carbon chloride 
C) dichlorocalcium 
D) calc two 
E) dicalcium chloride

Question 20

How would you describe the volume of the following object? the amount of water in a swimming pool

Accepted Answer

A) microscopic 
B) macroscopic 
C) submicroscopic 
D) all of the above 
E) none of the above 
A) microscopic 
B) macroscopic 
C) submicroscopic 
D) all of the above 
E) none of the above

Exam 14: Elements of Chemistry

Which of the following is an example of a chemical change?

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that

What chemical change occurs when a wax candle burns?

How many different elements are in the compound C6H12O6?

If you have two molecules of TiO2, how many oxygen atoms would you have?

Which of the following is an example of a physical change?

Which of the following is not a chemical change?

Which statement best describes a compound?

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

Which of the following would be considered a chemical property?

How many atoms are in one molecule of Na2SO4?

Which of the following would be considered a physical property?

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C. Which of the following statements is true?

Which of the following boxes represents a compound? A B C

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?

Of the three sciences, physics, chemistry, and biology, the most complex is

Is aging primarily an example of a physical or chemical change?

What is the name of the following compound? CaCl2

How would you describe the volume of the following object? the amount of water in a swimming pool

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

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading 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

How many different elements are in the compound C₆H₁₂O₆?

If you have two molecules of TiO_2, how many oxygen atoms would you have?

How many atoms are in one molecule of Na₂SO₄?

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O₂, and water, H₂O, have similar properties?

What is the name of the following compound? CaCl₂