Question 1

Describe the greenhouse effect.

Accepted Answer

Greenhouse gases allow visible

Question 2

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+   (g)→   N(s)
How many moles of   are needed to react with 0.450 mol of lithium?

Accepted Answer

A)  2.70 
B)  0.450 
C)  0.150 
D)  1.35 
E)  0.0750 
A)  2.70 
B)  0.450 
C)  0.150 
D)  1.35 
E)  0.0750

Question 3

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+   O(l)→   (s)
A 5.00-g sample of CaO is reacted with 4.83 g of   O.How many grams of water remain after the reaction is complete?

Accepted Answer

A)  0.00 
B)  0.00991 
C)  3.22 
D)  1.04 
E)  0.179 
A)  0.00 
B)  0.00991 
C)  3.22 
D)  1.04 
E)  0.179

Question 4

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Accepted Answer

A)  20.00% 
B)  25.00% 
C)  50.00% 
D)  12.50% 
A)  20.00% 
B)  25.00% 
C)  50.00% 
D)  12.50%

Question 5

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+   O(l)→   (s)
In a particular experiment,a 5.50-g sample of CaO is reacted with excess water and 6.77 g of   is recovered.What is the percent yield in this experiment?

Accepted Answer

A)  123 
B)  1.23 
C)  7.91 
D)  93.1 
E)  81.3 
A)  123 
B)  1.23 
C)  7.91 
D)  93.1 
E)  81.3

Question 6

How many moles of PCl5 will be produced if .331 moles of P4 is reacted with an excess of Cl2 using the following equation. P4(s)+ 10 Cl2(g)→ 4 PCl5(g)

Accepted Answer

A)  .331 mol 
B)  .662 mol 
C)  .993 mol 
D)  1.324 mol 
E)  1.655 mol 
A)  .331 mol 
B)  .662 mol 
C)  .993 mol 
D)  1.324 mol 
E)  1.655 mol

Question 7

Determine the theoretical yield of H2S (in moles)if 16 mol Al2S3 and 16 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s)+ 6 H2O(l)→ 2 Al(OH)3(s)+ 3 H2S(g)

Accepted Answer

A)  48 mol H2S 
B)  16 mol H2S 
C)  32 mol H2S 
D)  24 mol H2S 
E)  8.0 mol H2S 
A)  48 mol H2S 
B)  16 mol H2S 
C)  32 mol H2S 
D)  24 mol H2S 
E)  8.0 mol H2S

Question 8

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3).If ammonia is the only product,what mass of ammonia is formed?

Accepted Answer

A)  17.03 g 
B)  1.10 g 
C)  14.01 g 
D)  3.02 g 
E)  23.07 g 
A)  17.03 g 
B)  1.10 g 
C)  14.01 g 
D)  3.02 g 
E)  23.07 g

Question 9

How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction?
2 Cu2O(s)+ O2(g)→ 4 CuO(s)

Accepted Answer

A)  1.12 mol 
B)  2.25 mol 
C)  4.50 mol 
D)  9.00 mol 
A)  1.12 mol 
B)  2.25 mol 
C)  4.50 mol 
D)  9.00 mol

Question 10

Which of the following represents a physical property?

Accepted Answer

A)  Sodium metal is extremely reactive with chlorine gas. 
B)  Mercury is a silvery liquid at room temperature. 
C)  Aluminum has a tendency to "rust." 
D)  Butane is highly flammable. 
E)  Argon has an unreactive nature. 
A)  Sodium metal is extremely reactive with chlorine gas. 
B)  Mercury is a silvery liquid at room temperature. 
C)  Aluminum has a tendency to "rust." 
D)  Butane is highly flammable. 
E)  Argon has an unreactive nature.

Question 11

Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C3H7SH present.
C3H7SH(l)+ 6 O2(g)→ 3 CO2(g)+ SO2(g)+ 4 H2O(g)

Accepted Answer

A)  1.55 moles O2 
B)  3.50 moles O2 
C)  2.33 moles O2 
D)  4.14 moles O2 
E)  6.21 moles O2 
A)  1.55 moles O2 
B)  3.50 moles O2 
C)  2.33 moles O2 
D)  4.14 moles O2 
E)  6.21 moles O2

Question 12

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s)+   (g)→   N(s)
How many moles of lithium are needed to produce 0.45 mol of   N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

A)  0.23 
B)  1.4 
C)  0.15 
D)  0.30 
E)  2.7 
A)  0.23 
B)  1.4 
C)  0.15 
D)  0.30 
E)  2.7

Question 13

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+   (g)→ 2MgO(s)
How many moles of   are consumed when 1.90 mol of magnesium burns?

Accepted Answer

A)  0.0782 
B)  1.05 
C)  1.90 
D)  3.80 
E)  0.950 
A)  0.0782 
B)  1.05 
C)  1.90 
D)  3.80 
E)  0.950

Question 14

When 8.00 × 1022 molecules of ammonia react with 7.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced?
4 NH3(g)+ 3 O2(g)→ 2 N2(g)+ 6 H2O(g)

Accepted Answer

A)  1.86 g 
B)  2.17 g 
C)  4.88 g 
D)  7.44 g 
A)  1.86 g 
B)  2.17 g 
C)  4.88 g 
D)  7.44 g

Question 15

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 42.0 g of O2?
2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)

Accepted Answer

A)  69.7 g 
B)  107 g 
C)  165 g 
D)  371 g 
A)  69.7 g 
B)  107 g 
C)  165 g 
D)  371 g

Question 16

How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen.
6 Li(s)+ N2(g)→ 2 Li3N(s)

Accepted Answer

A)  18.3 g Li3N 
B)  20.3 g Li3N 
C)  58.3 g Li3N 
D)  61.0 g Li3N 
E)  15.1 g Li3N 
A)  18.3 g Li3N 
B)  20.3 g Li3N 
C)  58.3 g Li3N 
D)  61.0 g Li3N 
E)  15.1 g Li3N

Question 17

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid?
H2CO3 → H2O + CO2

Accepted Answer

A)  8.80 g 
B)  17.5 g 
C)  12.4 g 
D)  3.60 g 
E)  42.7 g 
A)  8.80 g 
B)  17.5 g 
C)  12.4 g 
D)  3.60 g 
E)  42.7 g

Question 18

Choose the reaction that represents the combustion of C6H12O2.

Accepted Answer

A)  C6H12O2(l) + 8 O2(g) → 6 CO2(g) + 6 H2O(g) 
B)  Mg(s) + C6H12O2(l) → MgC6H12O2(aq) 
C)  6 C(s) + 6 H2(g) + O2(g) → C6H12O2(l) 
D)  C6H12O2(l) → 6 C(s) + 6 H2(g) + O2(g) 
E)  None of the above represent the combustion of C6H12O2. 
A)  C6H12O2(l) + 8 O2(g) → 6 CO2(g) + 6 H2O(g) 
B)  Mg(s) + C6H12O2(l) → MgC6H12O2(aq) 
C)  6 C(s) + 6 H2(g) + O2(g) → C6H12O2(l) 
D)  C6H12O2(l) → 6 C(s) + 6 H2(g) + O2(g) 
E)  None of the above represent the combustion of C6H12O2.

Question 19

How many grams of oxygen are formed when 5.30 moles of KOH are formed?
4 KO(s)+ 2 H2O(l)→ 4 KOH(s)+ O2(g)

Accepted Answer

A)  5.30 g O2 
B)  21.2 g O2 
C)  42.4 g O2 
D)  170 g O2 
E)  84.8 g O2 
A)  5.30 g O2 
B)  21.2 g O2 
C)  42.4 g O2 
D)  170 g O2 
E)  84.8 g O2

Question 20

Sodium metal and water react to form hydrogen and sodium hydroxide.If 17.94 g of sodium react with water to form 0.78 g of hydrogen and 31.20 g of sodium hydroxide,what mass of water was involved in the reaction?

Accepted Answer

A)  14.04 g 
B)  17.94 g 
C)  30.42 g 
D)  31.98 g 
A)  14.04 g 
B)  17.94 g 
C)  30.42 g 
D)  31.98 g

Exam 8: Chemical Reactions and Chemical Quantities

Describe the greenhouse effect.

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ (g)→ N(s) How many moles of are needed to react with 0.450 mol of lithium?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ O(l)→ (s) A 5.00-g sample of CaO is reacted with 4.83 g of O.How many grams of water remain after the reaction is complete?

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ O(l)→ (s) In a particular experiment,a 5.50-g sample of CaO is reacted with excess water and 6.77 g of is recovered.What is the percent yield in this experiment?

How many moles of PCl5 will be produced if .331 moles of P4 is reacted with an excess of Cl2 using the following equation. P4(s)+ 10 Cl2(g)→ 4 PCl5(g)

Determine the theoretical yield of H2S (in moles)if 16 mol Al2S3 and 16 mol H2O are reacted according to the following balanced reaction.A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s)+ 6 H2O(l)→ 2 Al(OH)3(s)+ 3 H2S(g)

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3).If ammonia is the only product,what mass of ammonia is formed?

How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction? 2 Cu2O(s)+ O2(g)→ 4 CuO(s)

Which of the following represents a physical property?

Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C3H7SH present. C3H7SH(l)+ 6 O2(g)→ 3 CO2(g)+ SO2(g)+ 4 H2O(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s)+ (g)→ N(s) How many moles of lithium are needed to produce 0.45 mol of N when the reaction is carried out in the presence of excess nitrogen?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+ (g)→ 2MgO(s) How many moles of are consumed when 1.90 mol of magnesium burns?

When 8.00 × 1022 molecules of ammonia react with 7.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH3(g)+ 3 O2(g)→ 2 N2(g)+ 6 H2O(g)

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 42.0 g of O2? 2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)

How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s)+ N2(g)→ 2 Li3N(s)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H2CO3 → H2O + CO2

Choose the reaction that represents the combustion of C6H12O2.

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s)+ 2 H2O(l)→ 4 KOH(s)+ O2(g)

Sodium metal and water react to form hydrogen and sodium hydroxide.If 17.94 g of sodium react with water to form 0.78 g of hydrogen and 31.20 g of sodium hydroxide,what mass of water was involved in the reaction?

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

How many moles of PCl₅ will be produced if .331 moles of P₄ is reacted with an excess of Cl₂ using the following equation. P₄(s)+ 10 Cl₂(g)→ 4 PCl₅(g)

Determine the theoretical yield of H₂S (in moles)if 16 mol Al₂S₃ and 16 mol H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is Al₂S₃= 150.17 g/mol. Al₂S₃(s)+ 6 H₂O(l)→ 2 Al(OH)₃(s)+ 3 H₂S(g)

A 14.01 g sample of N₂ reacts with 3.02 g of H₂ to form ammonia (NH₃).If ammonia is the only product,what mass of ammonia is formed?

How many moles of CuO can be produced from 2.25 mol of Cu₂O in the following reaction? 2 Cu₂O(s)+ O₂(g)→ 4 CuO(s)

Consider the following reaction.How many moles of oxygen are required to produce 2.33 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l)+ 6 O₂(g)→ 3 CO₂(g)+ SO₂(g)+ 4 H₂O(g)

When 8.00 × 10²² molecules of ammonia react with 7.00 × 10²² molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4 NH₃(g)+ 3 O₂(g)→ 2 N₂(g)+ 6 H₂O(g)

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 42.0 g of O₂? 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)

How many grams of Li₃N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s)+ N₂(g)→ 2 Li₃N(s)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Choose the reaction that represents the combustion of C₆H₁₂O₂.

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s)+ 2 H₂O(l)→ 4 KOH(s)+ O₂(g)