Question 1

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq)  + (NH4) 3PO4(aq)  →

Accepted Answer

A)  cobalt(II) phosphate, Co 3(PO 4) 2
B)  cobalt(III) phosphate, Co 3(PO 4) 2
C)  cobalt(II) phosphate, CoPO 4
D)  cobalt(III) phosphate, CoPO 4
E)  ammonium sulfate, (NH 4) 2SO 4F) A) and B)
G) A) and C)

Question 2

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Accepted Answer

A) True 
 B)False

Question 3

Sodium chlorate is used as an oxidizer in the manufacture of dyes, explosives, and matches. Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO3 (ℳ = 106.45 g/mol) .

Accepted Answer

A)  419 g
B)  169 g
C)  0.419 g
D)  0.169 g
E)  0.00394 gF) B) and E)
G) D) and E)

Question 4

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Accepted Answer

A)  1.99 M
B)  1.50 M
C)  1.12 M
D)  0.502 M
E)  0.00199 MF) A) and B)
G) None of the above

Question 5

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Accepted Answer

A)  2.543 mol
B)  1.383 mol
C)  0.7232 mol
D)  0.3932 mol
E)  0.001383 molF) A) and D)
G) B) and D)

Question 6

Which of the following solutions will be the poorest conductor of electrical current?

Accepted Answer

A)  sucrose, C 12H 22O 11( aq) 
B)  Sodium chloride, NaCl( aq) 
C)  Potassium nitrate, KNO 3( aq) 
D)  Lithium hydroxide, LiOH( aq) 
E)  Sulfuric acid, H 2SO 4( aq) F) A) and B)
G) B) and C)

Question 7

Potassium carbonate, K2CO3, sodium iodide, NaI, potassium bromide, KBr, methanol, CH3OH, and ammonium chloride, NH4Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute?

Accepted Answer

A)  K 2CO 3
B)  NaI
C)  KBr
D)  CH 3OH
E)  NH 4ClF) A) and B)
G) A) and D)

Question 8

In a redox reaction, the oxidizing agent undergoes loss of electrons.

Accepted Answer

A) True 
 B)False

Question 9

Select the best statement relating to the following reaction: 2MnO2(s)  + KClO3(aq)  + 2KOH(aq)  → 2KMnO4(aq)  + KCl(aq)  + H2O(l)

Accepted Answer

A)  Mn in MnO 2 is oxidized.
B)  O in KClO 3 is the oxidizing agent.
C)  K in KClO 3 is the reducing agent.
D)  H in KOH is oxidized.
E)  Cl in KClO 3 is the reducing agent.F) B) and C)
G) C) and D)

Question 10

How many moles of ions are released when 1.6 mol of ammonium phosphate, (NH4) 3PO4, is dissolved in water?

Accepted Answer

A)  0.40 mol
B)  1.6 mol
C)  3.2 mol
D)  4.8 mol
E)  6.4 molF) All of the above
G) A) and E)

Question 11

Identify all the spectator ions in the following reaction. 2KMnO4(aq)  + 10FeSO4(aq)  + 8H2SO4(aq)  → K2SO4(aq)  + 2MnSO4(aq)  + 5Fe2(SO4) 3(aq)  + 8H2O(l)

Accepted Answer

A)  only K +
B)  only SO 4 2−
C)  only K + and SO 4 2−
D)  only K +, SO 4 2−, and Fe 2+
E)  only K +, SO 4 2−, Fe 2+, and Mn 2+F) C) and D)
G) A) and D)

Question 12

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Accepted Answer

A)  28.5 mol
B)  1.04 mol
C)  0.139 mol
D)  0.0285 mol
E)  0.00721 molF) All of the above
G) A) and E)

Question 13

Which one of the following is not a redox reaction?

Accepted Answer

A)  2H 2( g) + O 2( g) → 2H 2O( l) 
B)  Zn( s) + H 2SO 4( aq) → ZnSO 4( aq) + H 2( g) 
C)  H 2O( l) + NH 3( g) → NH 4+( aq) + OH −( aq) 
D)  6FeSO 4( aq) + K 2Cr 2O 7( aq) + 7H 2SO 4( aq) → Cr 2(SO 4) 3( aq) + 3Fe 2(SO 4) 3( aq) + K 2SO 4( aq) + 7H 2O( l) 
E)  Cl 2( g) + 2KBr( aq) → Br 2( l) + 2KCl( aq) F) All of the above
G) A) and E)

Question 14

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid?

Accepted Answer

A)  0.0524 M
B)  0.888 M
C)  1.13 M
D)  2.26 M
E)  2.43 MF) A) and B)
G) A) and D)

Question 15

Predict the product(s)  for the following reaction. BaO(s)  + CO2(g)  →

Accepted Answer

A)  Ba( s) + CO 3( g) 
B)  BaCO 3( s) 
C)  BaO( s) + C( s) 
D)  Ba( s) + CO 3 2-( s) 
E)  No reaction occurs.F) D) and E)
G) A) and E)

Question 16

Select the classification for the following reaction. 2Na(s)  + 2H2O(l)  → 2NaOH(aq)  + H2(g)

Accepted Answer

A)  Precipitation
B)  Acid-base
C)  Redox
D)  Combination
E)  None of these choices are correct.F) B) and D)
G) A) and C)

Question 17

The combustion of an element is always a combination reaction.

Accepted Answer

A) True 
 B)False

Question 18

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na5P3O10.

Accepted Answer

A)  +3
B)  +5
C)  +10
D)  +15
E)  None of these choices are correct.F) B) and E)
G) B) and D)

Question 19

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Accepted Answer

A)  0.184%
B)  1.63%
C)  3.26%
D)  5.43%
E)  9.23%F) B) and E)
G) B) and D)

Question 20

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (ℳ = 84.02 g/mol) ? HCl(aq)  + NaHCO3(s)  → NaCl(s)  + H2O(l)  + CO2(g)

Accepted Answer

A)  638 mL
B)  572 mL
C)  536 mL
D)  276 mL
E)  175 mLF) C) and D)
G) B) and C)

Exam 4: Three Major Classes of Chemical Reactions

Which one of the following is not a redox reaction?

Correct AnswerverifiedShow Answer

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na5P3O10.

Correct AnswerverifiedShow Answer

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Correct AnswerverifiedShow Answer

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Correct AnswerverifiedShow Answer

Predict the product(s) for the following reaction. BaO(s) + CO2(g) →

Correct AnswerverifiedShow Answer

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Correct AnswerverifiedShow Answer

Identify all the spectator ions in the following reaction. 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) → K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4) 3(aq) + 8H2O(l)

Correct AnswerverifiedShow Answer

Select the classification for the following reaction. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Correct AnswerverifiedShow Answer

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Correct AnswerverifiedShow Answer

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Correct AnswerverifiedShow Answer

In a redox reaction, the oxidizing agent undergoes loss of electrons.

Correct AnswerverifiedShow Answer

How many moles of ions are released when 1.6 mol of ammonium phosphate, (NH4) 3PO4, is dissolved in water?

Correct AnswerverifiedShow Answer

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (ℳ = 84.02 g/mol) ? HCl(aq) + NaHCO3(s) → NaCl(s) + H2O(l) + CO2(g)

Correct AnswerverifiedShow Answer

Sodium chlorate is used as an oxidizer in the manufacture of dyes, explosives, and matches. Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO3 (ℳ = 106.45 g/mol) .

Correct AnswerverifiedShow Answer

Which of the following solutions will be the poorest conductor of electrical current?

Correct AnswerverifiedShow Answer

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid?

Correct AnswerverifiedShow Answer

Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) → 2KMnO4(aq) + KCl(aq) + H2O(l)

Correct AnswerverifiedShow Answer

The combustion of an element is always a combination reaction.

Correct AnswerverifiedShow Answer

Potassium carbonate, K2CO3, sodium iodide, NaI, potassium bromide, KBr, methanol, CH3OH, and ammonium chloride, NH4Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute?

Correct AnswerverifiedShow Answer

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq) + (NH4) 3PO4(aq) →

Correct AnswerverifiedShow Answer

Correct Answer
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Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

Correct Answer
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Predict the product(s) for the following reaction. BaO(s) + CO₂(g) →

Correct Answer
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Vinegar is a solution of acetic acid, CH₃COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Correct Answer
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Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄) ₃(aq) + 8H₂O(l)

Correct Answer
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Select the classification for the following reaction. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

Correct Answer
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How many moles of ions are released when 1.6 mol of ammonium phosphate, (NH₄) ₃PO₄, is dissolved in water?

Correct Answer
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How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO₃(ℳ = 84.02 g/mol) ? HCl(aq) + NaHCO₃(s) → NaCl(s) + H₂O(l) + CO₂(g)

Correct Answer
verified

Sodium chlorate is used as an oxidizer in the manufacture of dyes, explosives, and matches. Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO₃(ℳ = 106.45 g/mol) .

Correct Answer
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Correct Answer
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Select the best statement relating to the following reaction: 2MnO₂(s) + KClO₃(aq) + 2KOH(aq) → 2KMnO₄(aq) + KCl(aq) + H₂O(l)

Correct Answer
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Correct Answer
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Potassium carbonate, K₂CO₃, sodium iodide, NaI, potassium bromide, KBr, methanol, CH₃OH, and ammonium chloride, NH₄Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute?

Correct Answer
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Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄) ₃PO₄(aq) →

Correct Answer
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