Chemistry 110 - Elements of General Chemistry » Spring 2023 » Chapter 3 Quiz

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Question #1
A pure substance is:
A.   composed of two or more different types of atoms or molecules combined in variable proportions.
B.   composed of two or more regions with different compositions.
C.   composed of only one type of atom or molecule.
D.   none of these
E.   composed of two or more different types of atoms or molecules that has constant composition.
Question #2
Which of the following items is a mixture?
A.   sugar
B.   none of these
C.   helium
D.   brass
E.   water
Question #3
Which of the following is a homogeneous mixture?
A.   molten iron
B.   water
C.   stainless steel
D.   none of these
E.   trail mix
Question #4
How would you classify sugar?
A.   mixture-homogeneous
B.   pure substance-element
C.   mixture-heterogeneous
D.   none of these
E.   pure substance-compound
Question #5
Which of the following is a physical property?
A.   the corrosive action of acid rain on granite
B.   the combustion of gasoline
C.   the tarnishing of a copper statue
D.   none of these
E.   the odor of spearmint gum
Question #6
Which of the following is a chemical property?
A.   the melting and boiling point of water
B.   the tarnishing of a copper statue
C.   none of these
D.   the odor of spearmint gum
E.   the paint color on a new red Corvette
Question #7
If you hold a solid piece of pure gallium metal in your hand, your body heat will melt the gallium into its liquid form. This illustrates which of the following?
A.   physical change
B.   distillation
C.   none of these
D.   chemical change
E.   chemical property
Question #8
When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of carbon dioxide were produced in the reaction?
A.   40
B.   18
C.   58
D.   none of these
E.   22
Question #9
What is the value of 27°C on the Kelvin temperature scale?
A.   27K
B.   246K
C.   300K
D.   81K
Question #10
What is the value of 472 K on the Fahrenheit temperature scale?
A.   358oF
B.   199oF
C.   472oF
D.   390oF
Question #11
A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g∙°C, what is the final temperature (in degrees Celsius) of the lead?
A.   29.3oC
B.   46.1oC
C.   32.5oC
D.   55.8oC
Question #12
Assume it takes 108 joules of energy to raise the temperature of a bar of gold from 25.0°C to 29.7°C. Given that the specific heat capacity of gold is 0.128 J/g °C, what is the mass (in grams) of the bar of gold?
A.   none of these
B.   129 g
C.   65 g
D.   1.8 x 102 g
E.   5.6 x 10-3 g

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