Question 1

How many anions are there in 2.50 g of MgBr2?

Accepted Answer

A)  8.18 × 1021 anions
B)  1.64 × 1022 anions
C)  4.43 × 1025 anions
D)  8.87 × 1025 anions

Question 2

What is the molar mass of nitrogen gas?

Accepted Answer

A)  14.0 g mol-1
B)  28.0 g mol-1
C)  6.02 × 1023 g mol-1
D)  1.20 × 1023 g mol-1

Question 3

How many cations are there in 10.0 g of sodium phosphate?

Accepted Answer

A)  3.67 × 1022 cations
B)  1.10 × 1023 cations
C)  9.87 × 1024 cations
D)  2.96 × 1025 cations

Question 4

What is the mass of a single fluorine molecule,F2?

Accepted Answer

A)  3.155 × 10-23 g
B)  6.310 × 10-23 g
C)  19.00 g
D)  38.00 g

Question 5

Identify the formula for magnesium nitrate hexahydrate.

Accepted Answer

A)  Mg(NO3) 2∙5H2O
B)  Mg(NO3) 2∙6H2O
C)  Mg(NO3) 2∙7H2O
D)  MgNO3∙5H2O
E)  MgNO3∙6H2O

Question 6

The compound Cu(N O2  ) 2,is named

Accepted Answer

A)  copper nitrite(II) .
B)  copper(I) nitrite.
C)  copper(I) nitrite(II) .
D)  copper(II) nitrite.

Question 7

Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%,H 4.48%,O 35.52%.Determine the empirical formula.

Accepted Answer

A)  C9H9O5
B)  C9H8O3
C)  C8H9O4
D)  C9H8O4
E)  C8H8O4

Question 8

Which of the following contains both ionic and covalent bonds?

Accepted Answer

A)  KI
B)  NH4Cl
C)  CaS
D)  H2S
E)  SiF4

Question 9

Determine the mass percent (to the hundredths place)of H in sodium bicarbonate (NaHCO3).

Accepted Answer

Question 10

The chemical formula for sulfurous acid is

Accepted Answer

A)  H2S(aq) .
B)  HSO3(aq) .
C)  HSO4(aq) .
D)  H2SO3(aq) .

Question 11

Identify the charge,X,on the phosphide ion PX.

Accepted Answer

A)  -4
B)  -3
C)  -2
D)  -1
E)  +1

Question 12

Which of the following is an ionic compound?

Accepted Answer

A)  SCl2
B)  Mg3(PO4) 2
C)  Cl2O
D)  CH2O
E)  PF5

Question 13

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane.The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

Accepted Answer

A)  8.59 mL
B)  13.5 mL
C)  7.40 mL
D)  12.4 mL
E)  11.6 mL

Question 14

A sample of pure lithium nitrate contains 10.1% lithium by mass.What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Accepted Answer

A)  5.05%
B)  10.1%
C)  20.2%
D)  40.4%

Question 15

How many molecules are in 16.61 g of acetic acid,C2H4O2?

Accepted Answer

A)  6.007 × 1026
B)  6.0375 × 1023
C)  1.666 × 1023
D)  6.0375 × 1020
E)  6.004 × 10-24

Question 16

How many moles are there in 3.00 g of ethanol,CH3CH2OH?

Accepted Answer

A)  0.00725 mol
B)  0.0652 mol
C)  15.3 mol
D)  138 mol

Question 17

Identify the nitrite ion.

Accepted Answer

A)   NO3−\mathrm { NO } _ { 3 } ^ { - }NO3−​ 
B)   NO2−\mathrm { NO } _ { 2 } ^ { - }NO2−​ 
C)   NH4+\mathrm { NH } _ { 4 } ^ { + }NH4+​ 
D)    N3−\mathrm { N } _ { 3 } ^ { - }N3−​ 
E)    N3- 	ext { N3- } N3-

Question 18

Identify the name for SnO.

Accepted Answer

A)  tin(I) oxide
B)  tin(II) oxide
C)  tin(III) oxide
D)  tin(IV) oxide

Question 19

Identify the compound with (a) covalent bond(s) .

Accepted Answer

A)  CH4
B)  CaCl2
C)  KBr
D)  MgCl2
E)  NaCl

Question 20

What is the chemical formula for magnesium hydride?

Accepted Answer

A)  MgH2
B)  MgOH
C)  MgOH2
D)  Mg(OH) 2

Exam 3: Molecules,compounds,and Nomenclature

Determine the mass percent (to the hundredths place)of H in sodium bicarbonate (NaHCO3).

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The chemical formula for sulfurous acid is

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What is the mass of a single fluorine molecule,F2?

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How many molecules are in 16.61 g of acetic acid,C2H4O2?

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Identify the charge,X,on the phosphide ion PX.

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What is the molar mass of nitrogen gas?

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The compound Cu(N O2 ) 2,is named

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Identify the name for SnO.

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A sample of pure lithium nitrate contains 10.1% lithium by mass.What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

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Combustion analysis of an unknown hydrocarbon produced the following results: C 60.00%,H 4.48%,O 35.52%.Determine the empirical formula.

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How many cations are there in 10.0 g of sodium phosphate?

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Which of the following is an ionic compound?

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Which of the following contains both ionic and covalent bonds?

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What is the chemical formula for magnesium hydride?

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How many moles are there in 3.00 g of ethanol,CH3CH2OH?

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Identify the formula for magnesium nitrate hexahydrate.

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Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane.The density of hexane is 0.6548 g mL-1 and its molar mass is 86.18 g mol-1.

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How many anions are there in 2.50 g of MgBr2?

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Identify the nitrite ion.

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Identify the compound with (a) covalent bond(s) .

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Determine the mass percent (to the hundredths place)of H in sodium bicarbonate (NaHCO₃).

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What is the mass of a single fluorine molecule,F₂?

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How many molecules are in 16.61 g of acetic acid,C₂H₄O₂?

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Identify the charge,X,on the phosphide ion P^X.

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The compound Cu(NO₂ ) ₂,is named

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How many moles are there in 3.00 g of ethanol,CH₃CH₂OH?

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Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane.The density of hexane is 0.6548 g mL^-1 and its molar mass is 86.18 g mol^-1.

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How many anions are there in 2.50 g of MgBr₂?

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