Question 1

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 2

The systematic names for water, ammonia, and methane are dihydrogen monoxide,   O; trihydrogen nitride, N   ; and tetrahydrogen carbide, C   . Why do most people, including chemists, prefer to use the common names for these compounds?

Accepted Answer

A) The common names are shorter and easier to pronounce. 
B) These compounds are encountered frequently. 
C) The common names are more widely known. 
D) all of the above 
A) The common names are shorter and easier to pronounce. 
B) These compounds are encountered frequently. 
C) The common names are more widely known. 
D) all of the above

Question 3

Which element would have chemical properties the most similar to chlorine (Cl)?

Accepted Answer

A) Br 
B) O 
C) Ar 
D) S 
E) Na 
A) Br 
B) O 
C) Ar 
D) S 
E) Na

Question 4

Which of the following would be considered a heterogeneous mixture?

Accepted Answer

A) salad dressing 
B) water 
C) milk 
D) vegetable oil 
E) vinegar 
A) salad dressing 
B) water 
C) milk 
D) vegetable oil 
E) vinegar

Question 5

The following image describes which type of change?

Accepted Answer

A) a physical change 
B) a chemical change 
C) an elemental change 
D) a change in reactivity 
E) no change 
A) a physical change 
B) a chemical change 
C) an elemental change 
D) a change in reactivity 
E) no change

Question 6

Which atom is smallest?

Accepted Answer

A) Be 
B) Mg 
C) Ca 
D) Sr 
E) All are the same size. 
A) Be 
B) Mg 
C) Ca 
D) Sr 
E) All are the same size.

Question 7

What happens to the properties of elements across any period of the periodic table?

Accepted Answer

A) The elements tend to become more metallic in nature since they are increasing in atomic number. 
B) The elements get much larger in size because of the addition of more protons and electrons. 
C) The properties of the elements gradually change across any period of the periodic table. 
D) All of the above are true. 
A) The elements tend to become more metallic in nature since they are increasing in atomic number. 
B) The elements get much larger in size because of the addition of more protons and electrons. 
C) The properties of the elements gradually change across any period of the periodic table. 
D) All of the above are true.

Question 8

Which of these does not describe a metal at room temperature?

Accepted Answer

A) gas 
B) solid 
C) liquid 
D) shiny 
E) bendable 
A) gas 
B) solid 
C) liquid 
D) shiny 
E) bendable

Question 9

If you have one molecule of CO2, how many molecules of O2 does it contain?

Accepted Answer

A) None, O2 is a different molecule than CO2. 
B) One, CO2 is a mixture of C and O2. 
C) Two, CO2 is a mixture of C and 2 O. 
D) Three, CO2 contains three molecules. 
E) none of the above 
A) None, O2 is a different molecule than CO2. 
B) One, CO2 is a mixture of C and O2. 
C) Two, CO2 is a mixture of C and 2 O. 
D) Three, CO2 contains three molecules. 
E) none of the above

Question 10

A chemical reaction is synonymous to a ________.

Accepted Answer

A) physical reaction 
B) change in phase 
C) rise in temperature 
D) chemical change 
A) physical reaction 
B) change in phase 
C) rise in temperature 
D) chemical change

Question 11

Which of the following would not be considered a chemical property?

Accepted Answer

A) the temperature at which a liquid will boil 
B) light sensitivity 
C) whether a metal will rust or not 
D) whether a material will dissolve in acid or not 
E) the tendency of a material to explode 
A) the temperature at which a liquid will boil 
B) light sensitivity 
C) whether a metal will rust or not 
D) whether a material will dissolve in acid or not 
E) the tendency of a material to explode

Question 12

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 13

How would you classify the following material? swimming pool water

Accepted Answer

A) homogeneous mixture 
B) heterogeneous mixture 
C) a pure element 
D) a pure compound 
E) depends on how many children have been in it 
A) homogeneous mixture 
B) heterogeneous mixture 
C) a pure element 
D) a pure compound 
E) depends on how many children have been in it

Question 14

Which of the following elements is in the fourth period?

Accepted Answer

A) chromium (Cr) 
B) hydrogen (H) 
C) beryllium(Be) 
D) carbon (
C)  
E) zirconium (Zr) 
A) chromium (Cr) 
B) hydrogen (H) 
C) beryllium(Be) 
D) carbon (
C)  
E) zirconium (Zr)

Question 15

A sample of iron weighs more after it rusts because ________.

Accepted Answer

A) it has expanded into a greater volume 
B) rust contains twice as many iron atoms 
C) of the additional oxygen it contains 
D) Wrong. Iron actually weighs less after it rusts 
A) it has expanded into a greater volume 
B) rust contains twice as many iron atoms 
C) of the additional oxygen it contains 
D) Wrong. Iron actually weighs less after it rusts

Question 16

The Colorado River water in Colorado has a salinity of about   . By the time this water passes into Mexico its salinity has increased to about   . How many milligrams of salts have been added to each liter of water?

Accepted Answer

A) 95 milligrams have been added to each liter of water. 
B) 950 milligrams have been added to each liter of water. 
C) 9500 milligrams have been added to each liter of water. 
D) 9.5 milligrams have been added to each liter of water. 
A) 95 milligrams have been added to each liter of water. 
B) 950 milligrams have been added to each liter of water. 
C) 9500 milligrams have been added to each liter of water. 
D) 9.5 milligrams have been added to each liter of water.

Question 17

How might you separate a mixture of sand and salt?

Accepted Answer

A) with tweezers and a magnifying glass 
B) just add water 
C) heat the mixture until one of the components melts 
D) Two of the above answers are reasonable. 
A) with tweezers and a magnifying glass 
B) just add water 
C) heat the mixture until one of the components melts 
D) Two of the above answers are reasonable.

Question 18

The following image represents which kind of matter?

Accepted Answer

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

Question 19

How would you classify the following material? coffee (with 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 20

Some products on the market today involving nanotechnology include ________.

Accepted Answer

A) cars 
B) elevators 
C) sunscreen 
D) cosmetics 
E) all of the above 
A) cars 
B) elevators 
C) sunscreen 
D) cosmetics 
E) all of the above

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

The systematic names for water, ammonia, and methane are dihydrogen monoxide, O; trihydrogen nitride, N ; and tetrahydrogen carbide, C . Why do most people, including chemists, prefer to use the common names for these compounds?

Which element would have chemical properties the most similar to chlorine (Cl)?

Which of the following would be considered a heterogeneous mixture?

The following image describes which type of change?

Which atom is smallest?

What happens to the properties of elements across any period of the periodic table?

Which of these does not describe a metal at room temperature?

If you have one molecule of CO_2, how many molecules of O₂ does it contain?

A chemical reaction is synonymous to a ________.

Which of the following would not be considered a chemical property?

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

How would you classify the following material? swimming pool water

Which of the following elements is in the fourth period?

A sample of iron weighs more after it rusts because ________.

The Colorado River water in Colorado has a salinity of about . By the time this water passes into Mexico its salinity has increased to about . How many milligrams of salts have been added to each liter of water?

How might you separate a mixture of sand and salt?

The following image represents which kind of matter?

How would you classify the following material? coffee (with milk)

Some products on the market today involving nanotechnology include ________.

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

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

The systematic names for water, ammonia, and methane are dihydrogen monoxide, O; trihydrogen nitride, N ; and tetrahydrogen carbide, C . Why do most people, including chemists, prefer to use the common names for these compounds?

Which element would have chemical properties the most similar to chlorine (Cl)?

Which of the following would be considered a heterogeneous mixture?

The following image describes which type of change?

Which atom is smallest?

What happens to the properties of elements across any period of the periodic table?

Which of these does not describe a metal at room temperature?

If you have one molecule of CO2, how many molecules of O2 does it contain?

A chemical reaction is synonymous to a ________.

Which of the following would not be considered a chemical property?

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

How would you classify the following material? swimming pool water

Which of the following elements is in the fourth period?

A sample of iron weighs more after it rusts because ________.

The Colorado River water in Colorado has a salinity of about . By the time this water passes into Mexico its salinity has increased to about . How many milligrams of salts have been added to each liter of water?

How might you separate a mixture of sand and salt?

The following image represents which kind of matter?

How would you classify the following material? coffee (with milk)

Some products on the market today involving nanotechnology include ________.

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 one molecule of CO_2, how many molecules of O₂ does it contain?