Question 1

Oxidation is the gain of electrons by an atom.

Accepted Answer

A) True 
 B)False  False

Question 2

A chemical change alters the chemical composition of a substance,and therefore a new substance is produced.

Accepted Answer

A) True 
 B)False

Question 3

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

Accepted Answer

A) True 
 B)False

Question 4

What is the formula weight of KCl?

Accepted Answer

A)  74.55 amu
B)  66.42 amu
C)  36.00 amu
D)  1386 amuE) A) and B)
F) B) and D)

Question 5

Which chemical equation is properly balanced?

Accepted Answer

A)  SO2 + O2 + H2O → H2SO4
B)  2 SO2 + O2 + 2 H2O → 2 H2SO4
C)  SO2 + O2 + 4 H2O → 2 H2SO4
D)  4 SO2 + O2 + 4 H2O → 4 H2SO4E) A) and D)
F) B) and D)

Question 6

In redox reactions,metals tend to undergo oxidation.

Accepted Answer

A) True 
 B)False

Question 7

Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?

Accepted Answer

A)  793 g
B)  7.93 g
C)  13.9 g
D)  0.139 gE) None of the above
F) B) and C)

Question 8

What is the mass of 3.4 × 1020 molecules of ethanol (C2H6O) expressed in milligrams?

Accepted Answer

A)  0.026 mg of ethanol
B)  26,000 mg of ethanol
C)  0.012 mg of ethanol
D)  26 mg of ethanolE) A) and D)
F) None of the above D

Question 9

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what ________ constitute the starting materials in a reaction and what ________ are formed.

Accepted Answer

The answer of A chemical equation is an expression that...

Question 10

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) . How many moles of H2O are needed to react completely with 7.54 mol of K?

Accepted Answer

A)  2 mol of H2O
B)  7.54 mol of H2O
C)  15.1 mol of H2O
D)  3.77 mol of H2OE) A) and C)
F) None of the above

Question 11

When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

Accepted Answer

A) True 
 B)False

Question 12

What is the formula weight of Co(NO3) 3?

Accepted Answer

A)  88.94 amu
B)  244.96 amu
C)  216.94 amu
D)  148.96 amu
E)  196.96 amuF) B) and C)
G) C) and E) B

Question 13

Which reaction is a double displacement reaction?

Accepted Answer

A)  3 Mg + Fe2O3 → 2 Fe + 3 MgO
B)  2 KBr + Cl2 → 2 KCl + Br2
C)  2 H2 + O2 → 2 H2O
D)  3 Ca(OH) 2 + Al2(SO4) 3 → 3 CaSO4 + 2 Al(OH) 3E) B) and C)
F) A) and D)

Question 14

In the balanced redox reaction: 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) ,which species is oxidized?

Accepted Answer

A)  C2H6(g) 
B)  O2(g) 
C)  CO2(g) 
D)  H2O(g) E) All of the above
F) B) and C)

Question 15

Write a balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) .

Accepted Answer

A)  C3H6O + O2 → CO2 + H2O
B)  C3H6O + 4 O2 → 3 CO2 + 3 H2O
C)  3 CO2 + 3 H2O → C3H6O + 4 O2
D)  6 C3H6O + 8 O2 → 6 CO2 + 6 H2OE) A) and B)
F) None of the above

Question 16

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)________ agent.

Accepted Answer

The answer of A compound that gains electrons in a...

Question 17

A mole of copper atoms has more atoms than a mole of lead atoms.

Accepted Answer

A) True 
 B)False

Question 18

The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

Accepted Answer

A) True 
 B)False

Question 19

Consider the mixture of Cl2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ? 2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   A)    B)    C)    D)   " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)   2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)   2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)   2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?   
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) B) and C)
F) A) and B)

Question 20

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. If 2.55 mol of sodium reacts,and 75.0 g of Na2O is produced,what is the percent yield?

Accepted Answer

A)  94.9% yield
B)  34.0% yield
C)  47.5% yield
D)  190.% yieldE) A) and D)
F) All of the above

Exam 5: Chemical Reactions

Oxidation is the gain of electrons by an atom.

Correct AnswerverifiedFalse

A chemical change alters the chemical composition of a substance,and therefore a new substance is produced.

Correct AnswerverifiedShow Answer

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

Correct AnswerverifiedShow Answer

What is the formula weight of KCl?

Correct AnswerverifiedShow Answer

Which chemical equation is properly balanced?

Correct AnswerverifiedShow Answer

In redox reactions,metals tend to undergo oxidation.

Correct AnswerverifiedShow Answer

Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?

Correct AnswerverifiedShow Answer

What is the mass of 3.4 × 1020 molecules of ethanol (C2H6O) expressed in milligrams?

Correct AnswerverifiedD

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what ________ constitute the starting materials in a reaction and what ________ are formed.

Correct AnswerverifiedShow Answer

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) . How many moles of H2O are needed to react completely with 7.54 mol of K?

Correct AnswerverifiedShow Answer

When the mass of a substance produced in a reaction must be calculated,first its number of moles is determined using mole ratios,and then Avogadro's number is used to convert moles to grams.

Correct AnswerverifiedShow Answer

What is the formula weight of Co(NO3) 3?

Correct AnswerverifiedB

Which reaction is a double displacement reaction?

Correct AnswerverifiedShow Answer

In the balanced redox reaction: 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) ,which species is oxidized?

Correct AnswerverifiedShow Answer

Write a balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) .

Correct AnswerverifiedShow Answer

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)________ agent.

Correct AnswerverifiedShow Answer

A mole of copper atoms has more atoms than a mole of lead atoms.

Correct AnswerverifiedShow Answer

The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

Correct AnswerverifiedShow Answer

Consider the mixture of Cl2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) → 2 ClF3(g) ?

Correct AnswerverifiedShow Answer

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. If 2.55 mol of sodium reacts,and 75.0 g of Na2O is produced,what is the percent yield?

Correct AnswerverifiedShow Answer

Correct Answer
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False

Correct Answer
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Consider the balanced reaction: 4 NO₂ + O₂ + 2 H₂O → 4 HNO₃. If 100. g of NO₂ is placed in a reaction vessel the theoretical yield of nitric acid (HNO₃)collected will be 137 g.

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What is the mass of 3.4 × 10²⁰ molecules of ethanol (C₂H₆O) expressed in milligrams?

Correct Answer
verified
D

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what constitute the starting materials in a reaction and what are formed.

Correct Answer
verified

Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H₂O(l) → 2 KOH(aq) + H₂(g) . How many moles of H₂O are needed to react completely with 7.54 mol of K?

Correct Answer
verified

Correct Answer
verified

What is the formula weight of Co(NO₃) ₃?

Correct Answer
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B

Correct Answer
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In the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(g) ,which species is oxidized?

Correct Answer
verified

Write a balanced chemical equation for the reaction of acetone (C₃H₆O) with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Consider the mixture of Cl₂ and F₂ in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl₂(g) + 3 F₂(g) → 2 ClF₃(g) ?

Correct Answer
verified

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O₂ → 2 Na₂O. If 2.55 mol of sodium reacts,and 75.0 g of Na₂O is produced,what is the percent yield?

Correct Answer
verified