Question 1

What substance is reduced in the following reaction?
4HCl + MnO2  →\rarr→  Cl2 + 2H2O + MnCl2

Accepted Answer

A)   Cl in HCl
B)   Mn in MnO2
C)   H in HCl
D)   O in MnO2

Question 2

The reducing agent is the substance that is reduced in the reaction.

Accepted Answer

A) True 
 B)False

Question 3

The reaction below would be considered _____ .
CaCO3 + heat  →\rarr→  CaO + CO2

Accepted Answer

A)   an endothermic combination.
B)   an exothermic combination.
C)   an endothermic decomposition.
D)   an exothermic decomposition.

Question 4

Acetylene,C2H2,burns according to the following reaction: C2H2+5O2 →\rarr→  4CO2+2H2O.Suppose 1.20 g of C2H2 is mixed with 3.50 g of O2 in a closed,steel container,and the mixture is ignited.What substances will be found in the mixture left when the burning is complete?

Accepted Answer

A)   CO2 and H2
B)   O2,CO2,and H2O
C)   C2H2,CO2,and H2O
D)   O2,C2H2,CO2,and H2O

Question 5

The reaction Mg + 3N2 $\rarr$ Mg3N2 is correctly balanced as written.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following phrases can be used to describe the process of reduction?

Accepted Answer

A)   to gain oxygen
B)   to combine with hydrogen
C)   to gain electrons
D)   to decrease in oxidation number

Question 7

Which of the following conversion factors would allow one to calculate the amount of PbI2 produced from a given amount of NaI in the following unbalanced reaction?
Pb(NO3) 2 + Nal  →\rarr→  Pbl2 + NaNO3

Accepted Answer

A)  2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3) 2 + Nal  \rarr  Pbl2 + NaNO3 
A)     
B)     
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B)  2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3) 2 + Nal  \rarr  Pbl2 + NaNO3 
A)     
B)     
C)     
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C)  2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3) 2 + Nal  \rarr  Pbl2 + NaNO3 
A)     
B)     
C)     
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D)  2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3) 2 + Nal  \rarr  Pbl2 + NaNO3 
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Question 8

Which species would be considered a spectator ion based on the following equation?
Ba2+ + 2NO3- + 2Na+ + SO42+  →\rarr→   BaSO4(s)  + 2NO3- + 2Na+

Accepted Answer

A)   Ba2+
B)   SO42+
C)   BaSO4
D)   2NO3-

Question 9

Oxygen can be prepared in the lab by heating potassium chlorate in the presence of a catalyst.The reaction is 2KClO3  →\rarr→  2KCl + 3O2.How many moles of O2 could be obtained from one mole of KClO3?

Accepted Answer

A)   1.5
B)   3.0
C)   1.0
D)   2.0

Question 10

Which ions will appear in the total ionic equation for the following reaction? + D)    ,   ,   ,and  " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  + 
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D)     ,   ,   ,and  " class="answers-bank-image d-inline" rel="preload" >
B)  + 
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C)  + 
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D)     ,   ,   ,and  " class="answers-bank-image d-inline" rel="preload" > ,and H+
D)  + 
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Question 11

When the equation below is properly balanced,what coefficient is in front of KCl?
KClO3  →\rarr→   KCl + O2

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 12

In which of the following does an element have an oxidation number of +4?

Accepted Answer

A)   TiO2
B)   HBr
C)   SO3
D)  2 
B)   HBr 
C)   SO3 
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Question 13

Products are always on the right side of a chemical equation.

Accepted Answer

A) True 
 B)False

Question 14

The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is: N2 + 3H2  →\rarr→   2NH3.When the equation is correctly interpreted in terms of moles,how many moles of H2 will react with one mole of N2?

Accepted Answer

A)   1
B)   2
C)   3
D)   6

Question 15

In the reaction 2CH4 + O2  →\rarr→   2CO + 4H2,how many molecules of CO will be produced by the complete reaction of 1.60 grams of CH4?

Accepted Answer

A)   12.0 * 1023
B)   3.01 * 1022
C)   6.02 *1022
D)   2.00

Question 16

A container is filled with 4.0 g H2 and 5.0 g O2.The mixture is ignited to produce water according to the following equation.How much water is produced?
2H2 + O2  →\rarr→  2H2O

Accepted Answer

A)   4.0 g
B)   5.0 g
C)   5.6 g
D)   9.0 g

Question 17

Which of the following is a double replacement reaction?

Accepted Answer

A)   CuO + H2  →\rarr→   Cu + H2O
B)   HBr + KOH  →\rarr→  H2O + KBr
C)   SO2 + H2O  →\rarr→  H2SO3
D)   2HI  →\rarr→   I2 + H2

Question 18

How many grams of N2 are required to completely react with 3.03 grams of H2 for the following balanced chemical equation? N2 + 3H2  →\rarr→  2NH3

Accepted Answer

A)   1.00
B)   6.00
C)   14.0
D)   28.0

Question 19

Which of the following reactions is correctly balanced?

Accepted Answer

A)   N2 + H  →\rarr→  2NH3
B)   2H2O + C  →\rarr→   CO + 2H2
C)   Zn + 2HCl  →\rarr→   H2 + ZnCl2
D)   CO + O2  →\rarr→  CO2

Question 20

What is the oxidation number of Br in 
?

Accepted Answer

A)   (-1) 
B)   +1
C)   +2
D)   +3

Exam 5: Chemical Reactions

A container is filled with 4.0 g H2 and 5.0 g O2.The mixture is ignited to produce water according to the following equation.How much water is produced? 2H2 + O2 →\rarr→ 2H2O

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Which ions will appear in the total ionic equation for the following reaction?

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Which species would be considered a spectator ion based on the following equation? Ba2+ + 2NO3- + 2Na+ + SO42+ →\rarr→ BaSO4(s) + 2NO3- + 2Na+

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Acetylene,C2H2,burns according to the following reaction: C2H2+5O2 →\rarr→ 4CO2+2H2O.Suppose 1.20 g of C2H2 is mixed with 3.50 g of O2 in a closed,steel container,and the mixture is ignited.What substances will be found in the mixture left when the burning is complete?

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Which of the following conversion factors would allow one to calculate the amount of PbI2 produced from a given amount of NaI in the following unbalanced reaction? Pb(NO3) 2 + Nal →\rarr→ Pbl2 + NaNO3

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What is the oxidation number of Br in ?

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Which of the following reactions is correctly balanced?

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What substance is reduced in the following reaction? 4HCl + MnO2 →\rarr→ Cl2 + 2H2O + MnCl2

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Which of the following phrases can be used to describe the process of reduction?

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In which of the following does an element have an oxidation number of +4?

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The reaction Mg + 3N2 →\rarr→ Mg3N2 is correctly balanced as written.

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Which of the following is a double replacement reaction?

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The reaction below would be considered _____ . CaCO3 + heat →\rarr→ CaO + CO2

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When the equation below is properly balanced,what coefficient is in front of KCl? KClO3 →\rarr→ KCl + O2

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The reducing agent is the substance that is reduced in the reaction.

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In the reaction 2CH4 + O2 →\rarr→ 2CO + 4H2,how many molecules of CO will be produced by the complete reaction of 1.60 grams of CH4?

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Products are always on the right side of a chemical equation.

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The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is: N2 + 3H2 →\rarr→ 2NH3.When the equation is correctly interpreted in terms of moles,how many moles of H2 will react with one mole of N2?

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Oxygen can be prepared in the lab by heating potassium chlorate in the presence of a catalyst.The reaction is 2KClO3 →\rarr→ 2KCl + 3O2.How many moles of O2 could be obtained from one mole of KClO3?

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How many grams of N2 are required to completely react with 3.03 grams of H2 for the following balanced chemical equation? N2 + 3H2 →\rarr→ 2NH3

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A container is filled with 4.0 g H₂ and 5.0 g O₂.The mixture is ignited to produce water according to the following equation.How much water is produced? 2H₂ + O₂ $\rarr$ 2H₂O

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Which species would be considered a spectator ion based on the following equation? Ba²⁺+ 2NO₃^- + 2Na⁺ + SO₄²⁺ $\rarr$ BaSO_4(s) + 2NO₃^- + 2Na⁺

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Acetylene,C₂H₂,burns according to the following reaction: C₂H₂+5O₂ $\rarr$ 4CO₂+2H₂O.Suppose 1.20 g of C₂H₂ is mixed with 3.50 g of O₂ in a closed,steel container,and the mixture is ignited.What substances will be found in the mixture left when the burning is complete?

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Which of the following conversion factors would allow one to calculate the amount of PbI₂ produced from a given amount of NaI in the following unbalanced reaction? Pb(NO₃) ₂ + Nal $\rarr$ Pbl₂ + NaNO₃

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Correct Answer
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What substance is reduced in the following reaction? 4HCl + MnO₂ $\rarr$ Cl₂ + 2H₂O + MnCl₂

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The reaction Mg + 3N₂ $\rarr$ Mg₃N₂ is correctly balanced as written.

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The reaction below would be considered _____ . CaCO₃ + heat $\rarr$ CaO + CO₂

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When the equation below is properly balanced,what coefficient is in front of KCl? KClO₃ $\rarr$ KCl + O₂

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In the reaction 2CH₄ + O₂ $\rarr$ 2CO + 4H₂,how many molecules of CO will be produced by the complete reaction of 1.60 grams of CH₄?

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Correct Answer
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The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is: N₂ + 3H₂ $\rarr$ 2NH₃.When the equation is correctly interpreted in terms of moles,how many moles of H₂ will react with one mole of N₂?

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Oxygen can be prepared in the lab by heating potassium chlorate in the presence of a catalyst.The reaction is 2KClO₃ $\rarr$ 2KCl + 3O₂.How many moles of O₂ could be obtained from one mole of KClO₃?

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How many grams of N₂ are required to completely react with 3.03 grams of H₂ for the following balanced chemical equation? N₂ + 3H₂ $\rarr$ 2NH₃

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