Question 1

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

Question 2

Some products on the market today involving nanotechnology include ________.

Accepted Answer

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

Question 3

Which atom is smallest?

Accepted Answer

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

Question 4

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.

Question 5

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

Question 6

A chemical reaction is synonymous to a ________.

Accepted Answer

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

Question 7

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

Question 8

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)

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Accepted Answer

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

Question 13

Which of the following would be considered a heterogeneous mixture?

Accepted Answer

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

Question 14

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

Question 15

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.

Question 16

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

Question 17

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

Question 18

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

Accepted Answer

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

Question 19

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

Question 20

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.

Exam 3: Elements of Chemistry

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

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Some products on the market today involving nanotechnology include ________.

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Which of the following elements is in the fourth period?

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

Correct AnswerverifiedShow Answer

Which of the following would be considered a heterogeneous mixture?

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

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

Correct AnswerverifiedShow Answer

The following image describes which type of change?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How would you classify the following material? swimming pool water

Correct AnswerverifiedShow Answer

The following image represents which kind of matter?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which atom is smallest?

Correct AnswerverifiedShow Answer

A chemical reaction is synonymous to a ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How might you separate a mixture of sand and salt?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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