Deck 3: Molecules,compounds,and Chemical Equations

Question 1

Give a possible molecular formula for the empirical formula of C₃H₅ClO.

A) C₆H₁₀ClO₂
B) C₅H₁₀Cl₂O₂
C) C₆H₁₀Cl₂O₂
D) C₆H₁₀O₂
E) C₆H₁₂Cl₂O₂

Answer 1

C₆H₁₀Cl₂O₂

Question 2

Give the name for TiCO₃.Remember that titanium forms several ions.

A) titanium(II) carbonate
B) titanium carbide
C) titanium carbonite
D) titanium(II) carbonite
E) titanium(I) carbonate

Answer 2

titanium(II) carbonate

Question 3

Calculate the molar mass of H₂CO₃.

A) 62.03 g/mol
B) 29.02 g/mol
C) 61.02 g/mol
D) 60.01 g/mol
E) 74.04 g/mol

Answer 3

62.03 g/mol

Question 4

Write the formula for copper (II)sulfate pentahydrate.

A) Cu₂SO₃^∙H₅
B) Cu₂S^∙H₂O
C) CuS^∙5H₂O
D) (CuSO₄)₅
E) CuSO₄^∙5H₂O

Question 5

Calculate the molar mass of Ca₃(PO₄)₂.

A) 87.05 g/mol
B) 215.21 g/mol
C) 310.18 g/mol
D) 279.21 g/mol
E) 246.18 g/mol

Question 6

Give the name for P₄O₁₀.

A) phosphorus(IV) oxide
B) diphosphorus pentoxide
C) phosphorus oxide
D) phosphorus(II) oxide
E) tetraphosphorus decoxide

Question 7

Give the name for SnO.

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

Question 8

Give the name for HNO₃.

A) nitric acid
B) nitrous acid
C) hydrogen nitrate
D) hydrogen nitrite
E) hydrogen nitride

Question 9

Identify the FALSE statement about acid rain.

A) Acid rain contains nitric acid and sulfuric acid.
B) Acid rain dissolves marble statues.
C) Acid rain comes from coal-powered electric power plants.
D) Acid rain corrodes steel bridges.
E) Acid rain comes from hydroelectric power plants.

Question 10

A covalent bond is best described as

A) the sharing of electrons between atoms.
B) the transfer of electrons.
C) a bond between a metal and a nonmetal.
D) a bond between a metal and a polyatomic ion.
E) a bond between two polyatomic ions.

Question 11

Give the name for H₂CO₃.

A) carbonous acid
B) dihydrogen carbonate
C) carbonic acid
D) hydrocarbonic acid
E) hydrocarbide acid

Question 12

Calculate the molar mass of Al(C₂H₃O₂)₃.

A) 86.03 g/mol
B) 204.13 g/mol
C) 56.00 g/mol
D) 258.09 g/mol
E) 139.99 g/mol

Question 13

What is the empirical formula for Hg₂(NO₃)₂?

A) Hg₂(NO₃)₂
B) HgNO₃
C) Hg(NO₃)₂
D) Hg₂NO₃
E) Hg₄(NO₃)₄

Question 14

Give the name for KMnO₄.

A) potassium manganese tetraoxide
B) potassium manganate
C) potassium permanganate
D) potassium permagnesium
E) potassium magnesate

Question 15

An ionic bond is best described as

A) the sharing of electrons.
B) the transfer of electrons from one atom to another.
C) the attraction that holds the atoms together in a polyatomic ion.
D) the attraction between two nonmetal atoms.
E) the attraction between two metal atoms.

Question 16

Write the name for Sn(SO₄)₂.Remember that Sn forms several ions.

A) tin(I) sulfite
B) tin(IV) sulfate
C) tin sulfide
D) tin(II) sulfite
E) tin(I) sulfate

Question 17

Give the formula for sulfurous acid.

A) H₂SO₃
B) HSO₃
C) H₂SO₄
D) HSO₄

Question 18

Give the correct formula for aluminum sulfate.

A) Al₂SO₄
B) Al(SO₄)₃
C) Al₃(SO₄)₂
D) Al₂(SO₄)₃

Question 19

Give the name for CoCl₂.6H₂O.Remember that Co forms several ions.

A) cobalt chloride hydrate
B) cobalt(I) chloride heptahydrate
C) cobalt(II) chloride heptahydrate
D) cobalt(II) chloride hexahydrate
E) cobalt(I) chloride

Question 20

Give the name for H₂SO₄.

A) sulfuric acid
B) persulfurous acid
C) sulfurous acid
D) hyposulfurous acid
E) persulfuric acid

Question 21

Determine the number of moles of oxygen in 3.20 moles of sodium hydrogen phosphate.

A) 6.40 moles of oxygen
B) 3.20 moles of oxygen
C) 9.60 moles of oxygen
D) 1.60 moles of oxygen
E) 12.80 moles of oxygen

Question 22

How many molecules of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.

A) 5.54 × 10²⁵ N₂O₄ molecules
B) 7.26 × 10²³ N₂O₄ molecules
C) 1.38 × 10²⁴ N₂O₄ molecules
D) 4.59 × 10²⁵ N₂O₄ molecules
E) 4.99 × 10²³ N₂O₄ molecules

Question 23

How many moles of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.

A) 7.02 × 10³ moles
B) 1.42 × 10^-4 moles
C) 1.00 mole
D) 1.21 moles
E) 0.829 moles

Question 24

How many SO₃^2- ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃ is 126.05 g/mol.

A) 1.52 × 10²⁷ SO₃ ions
B) 4.76 × 10²⁰ SO₃ ions
C) 2.10 × 10²¹ SO₃ ions
D) 1.05 × 10²¹ SO₃ ions
E) 9.52 × 10²⁰ SO₃ ions

Question 25

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

A) 1.23 × 10²³ O atoms
B) 2.96 × 10²⁴ O atoms
C) 2.87 × 10²⁵ O atoms
D) 1.10 × 10²⁴ O atoms
E) 3.68 × 10²³ O atoms

Question 26

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C₂H₅O₂.

A) C₂H₅O₂
B) C₆H₁₅O₆
C) C₃H₇O₃
D) C₄H₁₀O₄
E) C₈H₂₀O₈

Question 27

Calculate the mass percent composition of lithium in Li₃PO₄.

A) 26.75%
B) 17.98%
C) 30.72%
D) 55.27%
E) 20.82%

Question 28

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.

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 atoms

Question 29

Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane.The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.

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

Question 30

How many millimoles of Ca(NO₃)₂ contain 4.78 × 10²² formula units of Ca(NO₃)₂? The molar mass of Ca(NO₃)₂ is 164.10 g/mol.

A) 12.6 mmol Ca(NO₃)₂
B) 13.0 mmol Ca(NO₃)₂
C) 20.7 mmol Ca(NO₃)₂
D) 79.4 mmol Ca(NO₃)₂
E) 57.0 mmol Ca(NO₃)₂

Question 31

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

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 butane

Question 32

How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g/mol.

A) 9.83 × 10²⁰ C₂H₄ molecules
B) 7.74 × 10²⁶ C₂H₄ molecules
C) 2.71 × 10²⁰ C₂H₄ molecules
D) 3.69 × 10²³ C₂H₄ molecules
E) 4.69 × 10²³ C₂H₄ molecules

Question 33

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

A) NO
B) N₂O
C) NO₂
D) N₂O₃
E) NO₃

Question 34

The molecular weight of urea ((NH₂)₂CO),a compound used as a nitrogen fertilizer,is ________ amu (rounded to one decimal place).

A) 44.0
B) 43.0
C) 60.1
D) 8.0
E) 32.0

Question 35

What is the mass (in kg)of 6.89 × 10²⁵ molecules of CO₂? The molar mass of CO₂ is 44.01 g/mol.

A) 3.85 kg
B) 5.04 kg
C) 2.60 kg
D) 3.03 kg
E) 6.39 kg

Question 36

Determine the molecular formula of a compound that has a molar mass of 92.0 g/mol and an empirical formula of NO₂.

A) N₂O₃
B) N₃O₆
C) N₂O₄
D) NO₂
E) N₂O₅

Question 37

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.

A) P₃Cl
B) PCl
C) PCl₂
D) P₂Cl₃
E) PCl₃

Question 38

Determine the number of moles of sodium in 3.20 moles of sodium hydrogen phosphate.

A) 6.40 moles of sodium
B) 3.20 moles of sodium
C) 9.60 moles of sodium
D) 1.60 moles of sodium
E) 12.80 moles of sodium

Question 39

Calculate the mass percent composition of sulfur in Al₂(SO₄)₃.

A) 28.12%
B) 9.372%
C) 42.73%
D) 21.38%
E) 35.97%

Question 40

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

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 ions

Question 41

Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

A) H₂SO₄(aq) + LiOH(aq) → H₂O(l) + Li₂SO₄(aq)
B) H₂SO₃(aq) + 2 LiOH(aq) → 2 H₂O(l) + Li₂SO₃(aq)
C) HSO₃(aq) + LiOH(aq) → H₂O(l) + LiSO₃(aq)
D) HSO₄(aq) + LiOH(aq) → H₂O(l) + LiSO₄(aq)
E) H₂S(aq) + 2 LiOH(aq) → 2 H₂O(l) + Li₂S(aq)

Question 42

Identify the alcohol in fermented drinks.

A) CH₃CH₂CH₂OH
B) CH₃CH₂OH
C) CH₃OH
D) (CH₃)₂CHOH
E) HOCH₂CH₂OH

Question 43

Which of the following contains BOTH ionic and covalent bonds?

A) BaF₂
B) Cl₂
C) MgSO₄
D) SF₆
E) None of the above contains both ionic and covalent bonds.

Question 44

Identify the compound with covalent bonds.

A) CH₄
B) Ar
C) LiBr
D) Mg
E) NaI

Question 45

Determine the empirical formula for a compound that is 70.79% carbon,8.91% hydrogen,4.59% nitrogen,and 15.72% oxygen.

A) C₁₈H₂₇NO₃
B) C₁₈H₂₇NO₂
C) C₁₇H₂₇NO₃
D) C₁₇H₂₆NO₃

Question 46

Write a possible molecular formula for C₄H₄O.

A) C₂₄H₂₄O₆
B) C₁₂H₁₂O₂
C) C₂H₂O
D) C₈H₈O

Question 47

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.

A) 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(g)
B) C₂H₆(g) + 5 O(g) → 2 CO(g) + 3 H₂O(g)
C) 2 C₂H₆(g) + 5 O₂(g) → 4 CO(g) + 6 H₂O(g)
D) C₂H₆(g) + 7 O₍g₎ → 2 CO₂(g) + 3 H₂O(g)
E) 2 CH₃(g) + 5 O₍g₎ → 2 CO(g) + 3 H₂O(g)

Question 48

Which of the following is an ionic compound?

A) SCl₂
B) MgCl₂
C) Cl₂O
D) CH₂O
E) PCl₅

Question 49

What type of bonding is found in the compound PCl₅?

A) covalent bonding
B) hydrogen bonding
C) ionic bonding
D) metallic bonding

Question 50

In which set do all elements tend to form anions in binary ionic compounds?

A) K, Ga, Pb
B) Ca, Fe, Hg
C) Li, As, K
D) N, S, I

Question 51

What is the empirical formula for C₁₀H₂₀O₅?

A) C₂H₅O
B) CHO
C) C₂H₄O
D) CHO₂
E) CH₂O

Question 52

Identify the element that chlorine forms a covalent bond with.

A) carbon
B) sodium
C) barium
D) copper
E) nickel

Question 53

Determine the molecular formula of a compound that is 49.48% carbon,5.19% hydrogen,28.85% nitrogen,and 16.48% oxygen.The molecular weight is 194.19 g/mol.

A) C₈H₁₂N₄O₂
B) C₄H₅N₂O
C) C₈H₁₀N₄O₂
D) C₈H₁₀N₂O

Question 54

Identify rubbing alcohol.

A) CH₃CH₂CH₂OH
B) CH₃CH₂OH
C) CH₃OH
D) (CH₃)₂CHOH
E) HOCH₂CH₂OH

Question 55

Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

A) Al(C₂H₃O₂)₂(aq) + (NH₄)₂PO₄(aq) → AlPO₄(s) + 2 NH₄C₂H₃O₂(aq)
B) Al(C₂H₃O₂)₂(aq) + (NH₃)₂PO₄(aq) → AlPO₄(s) + 2 NH₃C₂H₃O₂(aq)
C) Al(CO₃)₂(aq) + (NH₃)₂PO₄(aq) → AlPO₄(s) + 2 NH₃CO₃(aq)
D) Al(C₂H₃O₂)₃(aq) + (NH₄)₃PO₄(aq) → AlPO₄(s) + 3 NH₄C₂H₃O₂(aq)
E) Al(CO₂)₃(aq) + (NH₄)₃PO₃(aq) → AlPO₃(s) + 3 NH₄CO₂(aq)

Question 56

Identify the compound with ionic bonds.

A) Ne
B) CO
C) N₂
D) H₂O
E) KCl

Question 57

Determine the empirical formula for a compound that contains C,H and O.It contains 52.14% C and 34.73% O by mass.

A) C₂H₆O
B) CHO
C) C₄H₁₃O₂
D) CH₄O₃
E) CH₃O

Question 58

Combustion analysis of 63.8 mg of a C,H and O containing compound produced 145.0 mg of CO₂ and 59.38 mg of H₂O.What is the empirical formula for the compound?

A) C₅H₂O
B) CHO
C) C₃H₆O
D) C₃H₇O
E) C₆HO₃

Question 59

Which of the following is a molecular compound?

A) KCN
B) LiOH
C) BaCl₂
D) ZnS
E) P₄O₁₀

Question 60

Identify the element that fluorine forms an ionic bond with.

A) carbon
B) sodium
C) xenon
D) phosphorus
E) oxygen

Question 61

Which of the compounds C₄H₁₀,SrCl₂,Cr(NO₃)₃,OF₂ are expected to exist as molecules?

A) only C₄H₁₀
B) C₄H₁₀ and OF₂
C) C₄H₁₀, Cr(NO₃)₂, and OF₂
D) SrCl₂ and Cr(NO₃)₂

Question 62

Which one of the following compounds contains ionic bonds?

A) RaO
B) HBr
C) PCl₃
D) CO₂
E) CCl₄

Question 63

In which set do all elements tend to form cations in binary ionic compounds?

A) Li, Sn, O
B) Ca, Zn, Sn
C) N, As, Bi
D) S, F, Br

Question 64

Which of the following is the correct chemical formula for a molecule of chlorine?

A) Cl
B) Cl^-
C) Cl⁺
D) Cl₂

Question 65

Which of the compounds,NaH ,PH₃,CH₄,IBr₃ are ionic compounds?

A) only CH₄
B) only NaH
C) Na H and PH₃
D) PH₃, CH₄, and IBr₃

Question 66

Give the common use for sodium nitrite.

A) inhibitor of bacterial growth
B) vinegar
C) sugar
D) beer
E) pepper

Question 67

Which of the following is a molecular compound?

A) CuCl₂
B) LiI
C) NaNO₃
D) CH Cl₃
E) RbBr

Question 68

Which of the following is a molecular element?

A) barium
B) iron
C) xenon
D) iodine
E) sodium

Question 69

Which of the following exists as a diatomic molecule?

A) oxygen
B) carbon
C) phosphorus
D) lithium
E) krypton

Question 70

What is the charge on the Co ions in Co₂O₃?

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

Question 71

Write the formula for the compound formed between rubidium and sulfur.

A) RbS
B) RbS₂
C) Rb₂S
D) Rb₂SO₃
E) Rb₃S₂

Question 72

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

A) Ac
B) H
C) Ar
D) S

Question 73

Which of the following is a molecular element?

A) krypton
B) silver
C) phosphorus
D) magnesium
E) titanium

Question 74

Which of the following is a molecular compound?

A) CuBr₂
B) P₂O₄
C) NaNO₃
D) SrSO₃
E) RbI

Question 75

Which of the following exists as a polyatomic molecule?

A) neon
B) carbon
C) phosphorus
D) lithium
E) argon

Question 76

Identify the element whose ion only exists as 1+.

A) barium
B) lithium
C) lead
D) nitrogen
E) radon

Question 77

Which of the following is an ionic compound?

A) NaCl
B) NO₂
C) PCl₃
D) CCl₄
E) SeBr₂

Question 78

Write the formula for the compound formed between aluminum and sulfur.

A) Al₂S₃
B) Al₃S
C) AlS₃
D) Al₂S
E) (AlS)₃

Question 79

Which of the following is an atomic element?

A) bromine
B) hydrogen
C) oxygen
D) fluorine
E) lithium

Question 80

Identify the element whose ion only exists as 2+.

A) calcium
B) cesium
C) lead
D) carbon
E) radon