Question 1

Oxygen,   , is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

Accepted Answer

A) Yes. This is the reason patients are given pure (100%)oxygen during medical procedures. 
B) Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. 
C) No. Breathing 100% oxygen for extended periods of time can be damaging to the body. 
D) No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes. 
A) Yes. This is the reason patients are given pure (100%)oxygen during medical procedures. 
B) Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. 
C) No. Breathing 100% oxygen for extended periods of time can be damaging to the body. 
D) No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes.

Question 2

A combination of two or more substances in which they no longer retain their chemical properties is called a(n)________.

Accepted Answer

A) mixture 
B) compound 
C) heterogeneous mixture 
D) periodic trend 
E) suspension 
A) mixture 
B) compound 
C) heterogeneous mixture 
D) periodic trend 
E) suspension

Question 3

Which of the following elements is a gas at room temperature?

Accepted Answer

A) argon (Ar) 
B) lead (Pb) 
C) cesium (Cs) 
D) indium (In) 
E) lithium (Li) 
A) argon (Ar) 
B) lead (Pb) 
C) cesium (Cs) 
D) indium (In) 
E) lithium (Li)

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

Nanotechnology may play an important role in the development of ________.

Accepted Answer

A) space elevators 
B) windfarms 
C) bullet proof clothing 
D) a storage medium for hydrogen fuel 
E) all of the above 
A) space elevators 
B) windfarms 
C) bullet proof clothing 
D) a storage medium for hydrogen fuel 
E) all of the above

Question 6

The four substances below are either elements or compounds. Which are which?

Accepted Answer

A) elements:   ; compounds:   
B) elements:     ; compounds:   
C) elements:   ; compounds:   
D) elements:   ; compounds:   
A) elements:   ; compounds:   
B) elements:     ; compounds:   
C) elements:   ; compounds:   
D) elements:   ; compounds:

Question 7

Which of the following physical properties would you expect for krypton (Kr)?

Accepted Answer

A) a gas at room temperature 
B) hard 
C) brittle 
D) shiny 
E) conducts electricity 
A) a gas at room temperature 
B) hard 
C) brittle 
D) shiny 
E) conducts electricity

Question 8

Which of the following is a metal?

Accepted Answer

A) titanium (atomic no. = 22) 
B) sulfur (atomic no. = 16) 
C) selenium (atomic no. = 34) 
D) xenon (atomic no. = 54) 
E) helium (atomic no. = 2) 
A) titanium (atomic no. = 22) 
B) sulfur (atomic no. = 16) 
C) selenium (atomic no. = 34) 
D) xenon (atomic no. = 54) 
E) helium (atomic no. = 2)

Question 9

How would you classify the following material? milk

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 10

Which of the following is a pure substance?

Accepted Answer

A) baking soda 
B) salt water 
C) cooking oil 
D) duct tape 
E) orange juice 
A) baking soda 
B) salt water 
C) cooking oil 
D) duct tape 
E) orange juice

Question 11

Should the periodic table be memorized? Why or why not?

Accepted Answer

A) Yes. Like the alphabet, we need to memorize the periodic table in order to easily write the language of chemistry. 
B) Yes. Without memorizing the periodic table, one would not have any real understanding of how and why chemical compounds are put together. 
C) No. The periodic table changes every year. Memorizing it would be a waste of time. 
D) No. The periodic table is a reference to be used, not memorized. 
A) Yes. Like the alphabet, we need to memorize the periodic table in order to easily write the language of chemistry. 
B) Yes. Without memorizing the periodic table, one would not have any real understanding of how and why chemical compounds are put together. 
C) No. The periodic table changes every year. Memorizing it would be a waste of time. 
D) No. The periodic table is a reference to be used, not memorized.

Question 12

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

Accepted Answer

A) Only A represents a suspension. 
B) Only B represents a suspension. 
C) Only C represents a suspension. 
D) All of the boxes represent a suspension. 
A) Only A represents a suspension. 
B) Only B represents a suspension. 
C) Only C represents a suspension. 
D) All of the boxes represent a suspension.

Question 13

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 14

Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?

Accepted Answer

A) A gallium chip would be even faster because the gallium is more metallic. 
B) A gallium chip would be slower because its electrons are more loosely held. 
C) Gallium is located just below aluminum, which is widely known to be an electrical insulator. 
D) Gallium is more nonmetallic and so it does not conduct electrons very well. 
A) A gallium chip would be even faster because the gallium is more metallic. 
B) A gallium chip would be slower because its electrons are more loosely held. 
C) Gallium is located just below aluminum, which is widely known to be an electrical insulator. 
D) Gallium is more nonmetallic and so it does not conduct electrons very well.

Question 15

Dioxins are highly toxic compounds that form upon the burning of certain plastics, especially PVC. Dioxins bioaccumulate, which means that animals higher in the food chain tend to have greater concentrations. Most of our exposure to dioxins comes from the food we eat rather than the air we breathe. How many milligrams of dioxins are there in a liter of milk containing   ?

Accepted Answer

A) 0.16 mg 
B) 1.6 ×   mg = 0.0016 mg 
C) 1.6 ×   mg = 0.00000016 mg 
D) 1.6 ×   mg = 0.000016 mg 
A) 0.16 mg 
B) 1.6 ×   mg = 0.0016 mg 
C) 1.6 ×   mg = 0.00000016 mg 
D) 1.6 ×   mg = 0.000016 mg

Question 16

Which of the following elements are in the same period as magnesium (Mg)?

Accepted Answer

A) Cl 
B) Ca 
C) Mn 
D) Sr 
E) none of the above 
A) Cl 
B) Ca 
C) Mn 
D) Sr 
E) none of the above

Oxygen, , is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

A combination of two or more substances in which they no longer retain their chemical properties is called a(n)________.

Which of the following elements is a gas at room temperature?

Nanotechnology may play an important role in the development of ________.

The four substances below are either elements or compounds. Which are which?

Which of the following physical properties would you expect for krypton (Kr)?

Which of the following is a metal?

How would you classify the following material? milk

Which of the following is a pure substance?

Should the periodic table be memorized? Why or why not?

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

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

Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?

Which of the following elements are in the same period as magnesium (Mg)?

About Science

Particles of Matter

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

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

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Exam 3: Elements of Chemistry

Oxygen, , is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

A combination of two or more substances in which they no longer retain their chemical properties is called a(n)________.

Which of the following elements is a gas at room temperature?

Nanotechnology may play an important role in the development of ________.

The four substances below are either elements or compounds. Which are which?

Which of the following physical properties would you expect for krypton (Kr)?

Which of the following is a metal?

How would you classify the following material? milk

Which of the following is a pure substance?

Should the periodic table be memorized? Why or why not?

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

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

Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?

Which of the following elements are in the same period as magnesium (Mg)?

About Science

Particles of Matter

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

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

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