Question 1

A hypothetical element has two stable isotopes: one isotope has a mass of 106.9051 amu with an abundance of 48.183%, the other isotope has a mass of 108.9048 amu with an abundance of 51.825%. What is the average atomic mass of this element?

Accepted Answer

A)   107.980 amu
B)   107.970 amu
C)   107.960 amu
D)   107.950 amu
E)   107.940 amuF) A) and B)
G) A) and C)

Question 2

Elements 21 through 30 are known as __________

Accepted Answer

A)   alkaline earths.
B)   chalcogens.
C)   halides.
D)   transition metals.
E)   rare earths.F) B) and D)
G) A) and B)

Question 3

Give an example of a metalloid (aka semimetal).

Accepted Answer

Silicon; a...

Question 4

Identify the binary compound that has ionic bonding.

Accepted Answer

A)   H2O
B)   NO
C)   LiF
D)   CH4E) None of the above
F) B) and C)

Question 5

Dalton's law of multiple proportions deals with __________

Accepted Answer

A)   the proportions of reacting chemicals that maximize the reaction rate.
B)   the total number of different compounds that can be made from two elements.
C)   the volumes of two elements that can combine to form two or more compounds.
D)   the masses of two elements that can combine to form two or more compounds.
E)   reactions that involve multiple steps.F) A) and D)
G) A) and C)

Question 6

Which contains more carbon by mass, 1 g of CO2 or 1 g of CO?

Accepted Answer

A)   CO2
B)   CO
C)   Both contain the same mass of carbon.
D)   Both contain the same mass of carbon, but different masses of oxygen.E) A) and D)
F) A) and C)

Question 7

He is the symbol for __________

Accepted Answer

A)   hydrogen.
B)   hafnium.
C)   mercury.
D)   helium.
E)   holmium.F) A) and D)
G) All of the above

Question 8

What is the correct symbol for an  particle?

Accepted Answer

A)    particle? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)    particle? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)    particle? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)    particle? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)    particle? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) All of the above
G) None of the above

Question 9

The average atomic mass of carbon is 12.01 amu. What is the average atomic mass of carbon in grams? (1 amu = 1.6605402 F1F1F1S1F1F1F10 10-27 kg)

Accepted Answer

1.994 F1F1F1S1F1F1F10 10^-²³ g

Question 10

Nuclear reactors used for power generation require uranium enriched in uranium-235. What is the average atomic mass of enriched uranium consisting of exactly 3.0% uranium-235 (235.04 amu) and 97.0% uranium-238 (238.05 amu)?

Accepted Answer

The answer of Nuclear reactors used for power generation require...

Question 11

Rutherford, Geiger, and Marsden's experiment demonstrated that the volume of the nucleus is roughly what fraction of the volume occupied by the electrons?

Accepted Answer

A)   1/10
B)   1/100
C)   1/1,000
D)   1/10,000
E)   1/100,000F) B) and E)
G) B) and C)

Question 12

In the atoms in the Rutherford-Geiger-Marsden experiment, the  particles were repelled by __________

Accepted Answer

A)   electrons.
B)   protons.
C)   neutrons.
D)   nuclei.
E)   gravity.F) B) and D)
G) A) and D)

Question 13

Give an example of an alkali metal.

Accepted Answer

Sodium; an...

Question 14

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Accepted Answer

A)   NO and N2O
B)   NO and NO2
C)   N2O and N2O5
D)   NO and N2O4
E)   N2O and N2O4F) None of the above
G) C) and D)

Question 15

What is the empirical formula for benzene, C6H6?

Accepted Answer

A)   CH
B)   C6H6
C)   C2H2
D)   CH3
E)   C6HF) A) and B)
G) A) and E)

Question 16

The average atomic mass of zinc is 65.39 amu. Given the data in the following table, what is the natural abundance of 66Zn? Isotope
Mass (amu) 
Natural Abundance (%) 64Zn
63) 9291
48) 8966Zn
65) 9260
?67Zn
66) 9271
4) 1168Zn
67) 9249
18) 5670Zn
69) 9253
0) 62

Accepted Answer

A)   27.81%
B)   0.2781%
C)   50.00%
D)   2.781%
E)   28.71%F) C) and D)
G) A) and C) A

Question 17

Oxygen is best described as a __________

Accepted Answer

A)   metalloid.
B)   metal.
C)   transition metal.
D)   noble gas.
E)   nonmetal.F) C) and D)
G) All of the above

Question 18

Manganese(IV)  oxide is a brown insoluble solid often found as a product of reactions of potassium permanganate. What is the formula of manganese(IV)  oxide?

Accepted Answer

A)   Mn4O
B)   MnO4
C)   Mn(IV) O
D)   MnO2
E)   Mn2O2F) C) and D)
G) A) and C)

Question 19

A  ion has __________ protons, __________ neutrons, and __________ electrons.

Accepted Answer

A)   8, 10, 8
B)   8, 10, 10
C)   8, 8, 10
D)   8, 8, 8
E)   8, 16, 8F) A) and E)
G) A) and B)

Question 20

When cosmic rays strike atoms in the upper atmosphere, energetic neutrons are produced. These neutrons collide with nitrogen-14 atoms, producing carbon-14 atoms and hydrogen atoms. Which diagram represents the carbon-14 product?

Accepted Answer

A)   
B)   
C)   
D)   E) A) and C)
F) None of the above D

Exam 2: Atoms, Ions, and Compounds

A hypothetical element has two stable isotopes: one isotope has a mass of 106.9051 amu with an abundance of 48.183%, the other isotope has a mass of 108.9048 amu with an abundance of 51.825%. What is the average atomic mass of this element?

Correct AnswerverifiedShow Answer

Elements 21 through 30 are known as __________

Correct AnswerverifiedShow Answer

Give an example of a metalloid (aka semimetal).

Correct AnswerverifiedSilicon; a...View AnswerShow Answer

Identify the binary compound that has ionic bonding.

Correct AnswerverifiedShow Answer

Dalton's law of multiple proportions deals with __________

Correct AnswerverifiedShow Answer

Which contains more carbon by mass, 1 g of CO2 or 1 g of CO?

Correct AnswerverifiedShow Answer

He is the symbol for __________

Correct AnswerverifiedShow Answer

What is the correct symbol for an  particle?

Correct AnswerverifiedShow Answer

The average atomic mass of carbon is 12.01 amu. What is the average atomic mass of carbon in grams? (1 amu = 1.6605402  10-27 kg)

Correct Answerverified1.994 F1F1F1S1F1F1F10 10-23 g

Nuclear reactors used for power generation require uranium enriched in uranium-235. What is the average atomic mass of enriched uranium consisting of exactly 3.0% uranium-235 (235.04 amu) and 97.0% uranium-238 (238.05 amu)?

Correct AnswerverifiedShow Answer

Rutherford, Geiger, and Marsden's experiment demonstrated that the volume of the nucleus is roughly what fraction of the volume occupied by the electrons?

Correct AnswerverifiedShow Answer

In the atoms in the Rutherford-Geiger-Marsden experiment, the  particles were repelled by __________

Correct AnswerverifiedShow Answer

Give an example of an alkali metal.

Correct AnswerverifiedSodium; an...View AnswerShow Answer

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Correct AnswerverifiedShow Answer

What is the empirical formula for benzene, C6H6?

Correct AnswerverifiedShow Answer

The average atomic mass of zinc is 65.39 amu. Given the data in the following table, what is the natural abundance of 66Zn? Isotope Mass (amu) Natural Abundance (%) 64Zn 63) 9291 48) 8966Zn 65) 9260 ?67Zn 66) 9271 4) 1168Zn 67) 9249 18) 5670Zn 69) 9253 0) 62

Correct AnswerverifiedA

Oxygen is best described as a __________

Correct AnswerverifiedShow Answer

Manganese(IV) oxide is a brown insoluble solid often found as a product of reactions of potassium permanganate. What is the formula of manganese(IV) oxide?

Correct AnswerverifiedShow Answer

A ion has __________ protons, __________ neutrons, and __________ electrons.

Correct AnswerverifiedShow Answer

When cosmic rays strike atoms in the upper atmosphere, energetic neutrons are produced. These neutrons collide with nitrogen-14 atoms, producing carbon-14 atoms and hydrogen atoms. Which diagram represents the carbon-14 product?

Correct AnswerverifiedD

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Silicon; a...
View Answer

Correct Answer
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Correct Answer
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Which contains more carbon by mass, 1 g of CO₂ or 1 g of CO?

Correct Answer
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Correct Answer
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The average atomic mass of carbon is 12.01 amu. What is the average atomic mass of carbon in grams? (1 amu = 1.6605402  10^-²⁷ kg)

Correct Answer
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1.994 F1F1F1S1F1F1F10 10^-²³ g

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Sodium; an...
View Answer

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What is the empirical formula for benzene, C₆H₆?

Correct Answer
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The average atomic mass of zinc is 65.39 amu. Given the data in the following table, what is the natural abundance of ⁶⁶Zn? Isotope Mass (amu) Natural Abundance (%) ⁶⁴Zn 63) 9291 48) 89⁶⁶Zn 65) 9260 ?⁶⁷Zn 66) 9271 4) 11⁶⁸Zn 67) 9249 18) 56⁷⁰Zn 69) 9253 0) 62

Correct Answer
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A

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A ion has protons, neutrons, and __ electrons.

Correct Answer
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D