Question 1

Calculate the molar mass for Mg(ClO4) 2.

Accepted Answer

A)   223.21 g/mol
B)   123.76 g/mol
C)   119.52 g/mol
D)   247.52 g/mol
E)   75.76 g/molF) C) and E)
G) B) and E)

Question 2

Which of the following exists as a diatomic molecule?

Accepted Answer

A)   hydrogen
B)   carbon
C)   phosphorus
D)   calcium
E)   xenonF) A) and D)
G) A) and C)

Question 3

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO2 and 1.161 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)   CH2
B)   C2H5
C)   C4H10
D)   C5H2E) A) and B)
F) None of the above

Question 4

Determine the name for F2O.

Accepted Answer

A)   fluorine oxide
B)   di fluorine monoxide
C)   fluorine (I)  oxide
D)   fluorine (II)  oxide
E)   fluorateF) A) and E)
G) A) and D)

Question 5

Identify the compound with covalent bonds.

Accepted Answer

A)   CH4
B)   Kr
C)   KBr
D)   K
E)   NaClF) A) and E)
G) D) and E)

Question 6

Which of the following statements is TRUE?

Accepted Answer

A)   An ionic bond is much stronger than most covalent bonds.
B)   An ionic bond is formed through the sharing of electrons.
C)   Ionic compounds at room temperature typically conduct electricity.
D)   Once dissolved in water, ionic compounds rarely conduct electricity.
E)   None of the above are true.F) None of the above
G) C) and D)

Question 7

A single covalent bond contains ________ of electrons.

Accepted Answer

A)   0 pairs
B)   1 pair
C)   2 pairs
D)   3 pairs
E)   4 pairsF) A) and B)
G) B) and E)

Question 8

Give the name for NaHSO3.

Accepted Answer

A)   sodium sulfite
B)   sodium sulfate
C)   sodium hydrogen sulfate
D)   sodium hydrogen sulfite
E)   sodium sulfideF) B) and E)
G) None of the above

Question 9

What is the formula for zinc chloride?

Accepted Answer

A)   ZnC
B)   Zn2Cl2
C)   ZnCl2
D)   Zn2Cl
E)   ZnCl3F) A) and C)
G) A) and D)

Question 10

Which of the following compounds is ethanol?

Accepted Answer

A)   C2H6
B)   C2H5OH
C)   CH3CO2H
D)   CH3CO2CH3
E)   CH3OCH3F) A) and B)
G) C) and E)

Question 11

What is the chemical formula for magnesium hydroxide?

Accepted Answer

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

Question 12

How many atoms of carbon are contained in 47.6 g of Al2(CO3) 3? The molar mass of Al2(CO3) 3 is 233.99 g/mol.

Accepted Answer

A)   1.23 × 1023 C atoms
B)   2.96 × 1024 C atoms
C)   2.87 × 1025 C atoms
D)   1.10 × 1024 C atoms
E)   3.68 × 1023 C atomsF) B) and E)
G) None of the above

Question 13

Determine the name for H2CO3.

Accepted Answer

A)   carbonous acid
B)   dihydrogen carbonate
C)   carbonic acid
D)   hydrocarbonic acid
E)   hydrocarbide acidF) B) and D)
G) None of the above

Question 14

Which of the following reactions is associated with the lattice energy of Li2O (ΔH°latt) ?

Accepted Answer

A)   Li2O(s)  → 2 Li⁺(g)  + O2⁻(g) 
B)   2 Li⁺(aq)  + O2⁻(aq)  → Li2O(s) 
C)   2 Li⁺(g)  + O2⁻(g)  → Li2O(s) 
D)   Li2O(s)  → 2 Li⁺(aq)  + O2⁻(aq) 
E)   2 Li(s)  + 2O (ΔH°latt) ? 
A)   Li2O(s)  → 2 Li⁺(g)  + O2⁻(g)  
B)   2 Li⁺(aq)  + O2⁻(aq)  → Li2O(s)  
C)   2 Li⁺(g)  + O2⁻(g)  → Li2O(s)  
D)   Li2O(s)  → 2 Li⁺(aq)  + O2⁻(aq)  
E)   2 Li(s)  +   O2(g)  → Li2O(s) " class="answers-bank-image d-inline" rel="preload" > O2(g)  → Li2O(s) F) C) and D)
G) A) and C)

Question 15

The solid compound,Na4SiO4,contains

Accepted Answer

A)   Na+, Si4+, and O2- ions.
B)   Na+ and SiO4 -4 ions.
C)   Na4+ and SiO4 -4 ions.
D)   Na4SiO4 molecules.E) B) and C)
F) A) and D)

Question 16

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. DH°(kJ) 
K(s) → K(g) 89
K(g) → K⁺(g) + e⁻ 419
Br2(l) → 2 Br(g) 193
K(s) + 2(l) → 2 Br(g) 193 K(s) +   Br2(g) → KBr(s) -394 KBr(s) → K⁺(g) + Br⁻(g) 674 A)  -885 kJ B)  -325 kJ C)  +367 kJ D)  -464 kJ E)  +246 kJ" class="answers-bank-image d-inline" rel="preload" > Br2(g) → KBr(s) -394
KBr(s) → K⁺(g) + Br⁻(g) 674

Accepted Answer

A)   -885 kJ
B)   -325 kJ
C)   +367 kJ
D)   -464 kJ
E)   +246 kJF) A) and B)
G) B) and C)

Question 17

What is the chemical formula for copper( II) phosphate?

Accepted Answer

A)   Cu2P
B)   Cu2PO4
C)   Cu3P2
D)   Cu3( PO4) 2E) A) and B)
F) A) and C)

Question 18

Which one of the following contains 35% carbon by mass?

Accepted Answer

A)   C2H2
B)   CH4
C)   CH3F 
D)   CO2E) None of the above
F) B) and C)

Question 19

How many moles are there in 4.00 g of ethanol,CH3CH2OH?

Accepted Answer

A)   0. 00543 mol
B)   0. 0870 mol
C)   11.5 mol
D)   184 molE) B) and D)
F) A) and B)

Question 20

What is the molar mass of chlorine gas?

Accepted Answer

A)   35.5 g/mol
B)   70.9 g/mol
C)   6.02 × 1023 g/mol
D)   1.20 × 1023 g/molE) A) and D)
F) B) and D)

Exam 5: Molecules and Compounds

How many moles are there in 4.00 g of ethanol,CH3CH2OH?

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Identify the compound with covalent bonds.

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What is the molar mass of chlorine gas?

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Which of the following statements is TRUE?

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What is the chemical formula for copper( II) phosphate?

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What is the chemical formula for magnesium hydroxide?

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How many atoms of carbon are contained in 47.6 g of Al2(CO3) 3? The molar mass of Al2(CO3) 3 is 233.99 g/mol.

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Which of the following exists as a diatomic molecule?

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Which one of the following contains 35% carbon by mass?

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What is the formula for zinc chloride?

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Which of the following compounds is ethanol?

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Determine the name for F2O.

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Determine the name for H2CO3.

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Which of the following reactions is associated with the lattice energy of Li2O (ΔH°latt) ?

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A single covalent bond contains ________ of electrons.

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Calculate the molar mass for Mg(ClO4) 2.

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The solid compound,Na4SiO4,contains

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Give the name for NaHSO3.

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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO2 and 1.161 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. DH°(kJ) K(s) → K(g) 89 K(g) → K⁺(g) + e⁻ 419 Br2(l) → 2 Br(g) 193 K(s) + Br2(g) → KBr(s) -394 KBr(s) → K⁺(g) + Br⁻(g) 674

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How many moles are there in 4.00 g of ethanol,CH₃CH₂OH?

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How many atoms of carbon are contained in 47.6 g of Al₂(CO₃) ₃? The molar mass of Al₂(CO₃) ₃is 233.99 g/mol.

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Determine the name for F₂O.

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Determine the name for H₂CO₃.

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Which of the following reactions is associated with the lattice energy of Li₂O (ΔH°_latt) ?

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Calculate the molar mass for Mg(ClO₄) ₂.

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The solid compound,Na₄SiO₄,contains

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Give the name for NaHSO₃.

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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO₂ and 1.161 g of H₂O.What is the empirical formula of the compound?

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Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. DH°(kJ) K(s) → K(g) 89 K(g) → K⁺(g) + e⁻ 419 Br₂(l) → 2 Br(g) 193 K(s) + Br₂(g) → KBr(s) -394 KBr(s) → K⁺(g) + Br⁻(g) 674

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