Question 1

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Accepted Answer

A)  1.8 g
B)  2.2 g
C)  3.7 g
D)  4.0 gE) A) and B)
F) None of the above

Question 2

Identify the name for aqueous H2SO4.

Accepted Answer

A)  sulfuric acid
B)  persulfurous acid
C)  sulfurous acid
D)  hyposulfurous acid
E)  persulfuric acidF) None of the above
G) All of the above

Question 3

Which of the compounds,C5H12,MgBr2,Mn(NO3) 2,PCl3, are expected to exist as molecules?

Accepted Answer

A)  only C5H12
B)  C5H12 and PCl3
C)  C5H12,Mn(NO3) 2,and PCl3
D)  MgBr2 and Mn(NO3) 2E) A) and D)
F) B) and D)

Question 4

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

Accepted Answer

A)  1.52 × 1027 sodium ions
B)  4.76 × 1020 sodium ions
C)  2.10 × 1021 sodium ions
D)  1.05 × 1021 sodium ions
E)  9.52 × 1020 sodium ionsF) None of the above
G) A) and E)

Question 5

Calculate the molar mass of Ca3(PO4) 2.

Accepted Answer

A)  87.05 g mol-1
B)  215.21 g mol-1
C)  310.18 g mol-1
D)  279.21 g mol-1
E)  246.18 g mol-1F) A) and E)
G) A) and D)

Question 6

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

Accepted Answer

A)  2.27 g
B)  7.70 g
C)  15.0 g
D)  20.5 gE) All of the above
F) B) and D)

Question 7

Identify the compound with (an) ionic bond(s) .

Accepted Answer

A)  CO2
B)  H2O2
C)  CH4
D)  LiBr
E)  H2F) None of the above
G) B) and C)

Question 8

Formaldehyde,CH2O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

Accepted Answer

A)  451 g
B)  407 g
C)  0.451 g
D)  246 g
E)  24.6 gF) A) and D)
G) C) and D)

Question 9

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

Accepted Answer

A)  2.59 × 1023 molecules butane
B)  1.46 × 1027 molecules butane
C)  6.87 × 1023 molecules butane
D)  1.56 × 1023 molecules butane
E)  7.14 × 1025 molecules butaneF) B) and D)
G) B) and C)

Question 10

Calculate the number of oxygen atoms in 1.187 g of nickel(II) carbonate.

Accepted Answer

A)  1.807 × 1026
B)  5.535 × 1023
C)  6.022 × 1021
D)  1.282 × 1022
E)  1.807 × 1022F) B) and D)
G) C) and D)

Question 11

How many oxygen atoms are there in 7.00 g of sodium dichromate,Na2Cr2O7?

Accepted Answer

A)  0.187 oxygen atoms
B)  2.30 × 1021 oxygen atoms
C)  1.60 × 1022 oxygen atoms
D)  1.13 × 1023 oxygen atomsE) C) and D)
F) B) and D)

Question 12

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

Accepted Answer

Question 13

What is the chemical formula for iron(III) sulfate?

Accepted Answer

A)  Fe3S
B)  Fe3SO4
C)  Fe2S3
D)  Fe2(SO4) 3E) C) and D)
F) A) and D)

Question 14

Which one of the following is not an empirical formula?

Accepted Answer

A)  CHO
B)  CH2O
C)  C2H4O
D)  C2H4O2E) B) and C)
F) A) and D)

Question 15

Identify the formula for copper (II) sulfate pentahydrate.

Accepted Answer

A)  Cu2SO3∙H5
B)  Cu2S∙H2O
C)  CuS∙5H2O
D)  (CuSO4) 5
E)  CuSO4∙5H2OF) C) and E)
G) All of the above

Question 16

How many molecules are in 0.1339 kg of ethanol,C2H6O?

Accepted Answer

A)  1.750 × 1024
B)  3.715 × 1027
C)  5.712 × 10-25
D)  9.763 × 1019
E)  9.763 × 1022F) A) and D)
G) None of the above

Question 17

Which of the following elements has the LEAST tendency to form an ion?

Accepted Answer

A)  Ca
B)  K
C)  Kr
D)  SeE) All of the above
F) B) and C)

Question 18

An aqueous solution of H2S is named

Accepted Answer

A)  hydrosulfuric acid.
B)  hydrosulfurous acid.
C)  sulfuric acid.
D)  sulfurous acid.E) A) and B)
F) A) and C)

Question 19

Which of the following exists as a polyatomic molecule?

Accepted Answer

A)  He
B)  C
C)  P
D)  Na
E)  NeF) B) and C)
G) B) and D)

Question 20

Which of the following compounds is ethanol?

Accepted Answer

A)  C2H6
B)  C2H5OH
C)  CH3CO2H
D)  CH3CO2CH3
E)  CH3-O-CH3F) C) and D)
G) None of the above

Exam 3: Molecules,compounds,and Nomenclature

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

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Calculate the number of oxygen atoms in 1.187 g of nickel(II) carbonate.

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Which of the following compounds is ethanol?

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An aqueous solution of H2S is named

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Identify the name for aqueous H2SO4.

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Calculate the molar mass of Ca3(PO4) 2.

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Identify the compound with (an) ionic bond(s) .

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A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

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Formaldehyde,CH2O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

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Which of the following elements has the LEAST tendency to form an ion?

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Which of the compounds,C5H12,MgBr2,Mn(NO3) 2,PCl3, are expected to exist as molecules?

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How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

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Which one of the following is not an empirical formula?

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How many molecules are in 0.1339 kg of ethanol,C2H6O?

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Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

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How many oxygen atoms are there in 7.00 g of sodium dichromate,Na2Cr2O7?

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How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

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Which of the following exists as a polyatomic molecule?

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What is the chemical formula for iron(III) sulfate?

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Identify the formula for copper (II) sulfate pentahydrate.

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An aqueous solution of H₂S is named

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Identify the name for aqueous H₂SO₄.

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Calculate the molar mass of Ca₃(PO₄) ₂.

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A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO₂ and 58.70 g of H₂O.What is the empirical formula of the alcohol?

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Formaldehyde,CH₂O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 10²⁴ molecules of formaldehyde.

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Which of the compounds,C₅H₁₂,MgBr₂,Mn(NO₃) ₂,PCl_3, are expected to exist as molecules?

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How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g mol^-1.

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How many molecules are in 0.1339 kg of ethanol,C₂H₆O?

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How many oxygen atoms are there in 7.00 g of sodium dichromate,Na₂Cr₂O₇?

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How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL^-1 and the molar mass is 58.12 g mol^-1.

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