Question 1

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)

Question 2

Microtechnology began ________.

Accepted Answer

A)   about 60 years ago with the invention of solid state transistors
B)   in the 1990s with the use of computers
C)   with the development of micron chemistry in the early 1800s
D)   at the close of World War II

Question 3

Nanotechnology looks at working with particles ________.

Accepted Answer

A)   100 microns or larger
B)   1 to 100 nanometers, the realm of individual atoms and molecules
C)   50 grams and smaller
D)   infinitesimally small, the size of electrons

Question 4

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:

Question 5

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 6

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.

Question 7

Which of the following would be considered a homogeneous mixture?

Accepted Answer

A)   wine
B)   hydrogen cyanide
C)   rusty iron
D)   pretzel
E)   sugar

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

Question 9

About how many elements do you have access to as a consumer of market goods?

Accepted Answer

A)   none
B)   one
C)   ten
D)   one hundred

Question 10

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

Question 11

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

Question 12

Which of the following describes a nonmetal?

Accepted Answer

A)   poor conductor of electricity
B)   shiny
C)   malleable
D)   ductile
E)   good conductor of heat

Question 13

What is the difference between a compound and a mixture?

Accepted Answer

A)   They both consist of atoms from different elements.
B)   The way in which their atoms are bonded together.
C)   One is a solid and the other is a liquid.
D)   The components of a mixture are not chemically bonded together.

Question 14

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 15

How many atoms are in one molecule of Na2SO4?

Accepted Answer

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

Question 16

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

Accepted Answer

A)   temperature at which a material catches on fire
B)   color
C)   conductivity
D)   hardness
E)   temperature at which a material melts

Question 17

Is the air in your house a homogeneous or heterogeneous mixture?

Accepted Answer

A)   homogeneous because it is mixed very well
B)   heterogeneous because of the dust particles it contains
C)   homogeneous because it is all at the same temperature
D)   heterogeneous because it consists of different types of molecules

Question 18

Nanotechnology and microtechnology are similar in that they both ________.

Accepted Answer

A)   are interdisciplinary
B)   have huge impacts on society
C)   are relatively new technologies
D)   all of the above

Question 19

Someone argues that he or she doesn't drink tap water because it contains thousands of molecules of some impurity in each glass. How would you respond in defense of the water's purity, if it indeed does contain thousands of molecules of some impurity per glass?

Accepted Answer

A)   Impurities aren't necessarily bad, in fact, they may be good for you.
B)   The water contains water molecules and each water molecule is pure.
C)   There's no defense. If the water contains impurities it should not be drunk.
D)   Compared to the billions and billions of water molecules, a thousand molecules of something else is practically nothing.

Question 20

Which of the following is not the name of a chemical family?

Accepted Answer

A)   heavy metals
B)   transition metals
C)   alkali metals
D)   alkaline-earth metals
E)   noble gases

Exam 3: Elements of Chemistry

Which of the following is not a chemical change?

Correct AnswerverifiedShow Answer

Is the air in your house a homogeneous or heterogeneous mixture?

Correct AnswerverifiedShow Answer

How would you classify the following material? milk

Correct AnswerverifiedShow Answer

Someone argues that he or she doesn't drink tap water because it contains thousands of molecules of some impurity in each glass. How would you respond in defense of the water's purity, if it indeed does contain thousands of molecules of some impurity per glass?

Correct AnswerverifiedShow Answer

How many atoms are in one molecule of Na2SO4?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Nanotechnology looks at working with particles ________.

Correct AnswerverifiedShow Answer

Which of the following is a metal?

Correct AnswerverifiedShow Answer

About how many elements do you have access to as a consumer of market goods?

Correct AnswerverifiedShow Answer

Which of the following describes a nonmetal?

Correct AnswerverifiedShow Answer

Microtechnology began ________.

Correct AnswerverifiedShow Answer

Nanotechnology and microtechnology are similar in that they both ________.

Correct AnswerverifiedShow Answer

What is the difference between a compound and a mixture?

Correct AnswerverifiedShow Answer

Which of the following is not the name of a chemical family?

Correct AnswerverifiedShow Answer

Which of the following would be considered a chemical property?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following would be considered a heterogeneous mixture?

Correct AnswerverifiedShow Answer

Which of the following would be considered a homogeneous mixture?

Correct AnswerverifiedShow Answer

How many different elements are in the compound C6H12O6?

Correct AnswerverifiedShow Answer

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How many atoms are in one molecule of Na₂SO₄?

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How many different elements are in the compound C₆H₁₂O₆?

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