Question 1

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

A)  0.045 mol L-1 Al2(SO4)3 
B)  0.050 mol L-1 (NH4)2CO3 
C)  0.10 mol L-1 LiBr 
D)  0.10 mol L-1 NaI 
E)  0.10 mol L-1 KF 
A)  0.045 mol L-1 Al2(SO4)3 
B)  0.050 mol L-1 (NH4)2CO3 
C)  0.10 mol L-1 LiBr 
D)  0.10 mol L-1 NaI 
E)  0.10 mol L-1 KF

Question 2

Which of the following is an acid-base reaction?

Accepted Answer

A)  C(s) + O2(g) → CO2(g) 
B)  2HClO4(aq) + Ca(OH)2(aq) → 2 H2O(l) + Ca(ClO4)2(aq) 
C)  Fe(s) + 2AgNO3(aq) → 2Ag(s) + Fe(NO3)2(aq) 
D)  MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) + BaSO4(s) 
E)  None of the above is an acid-base reaction. 
A)  C(s) + O2(g) → CO2(g) 
B)  2HClO4(aq) + Ca(OH)2(aq) → 2 H2O(l) + Ca(ClO4)2(aq) 
C)  Fe(s) + 2AgNO3(aq) → 2Ag(s) + Fe(NO3)2(aq) 
D)  MgSO4(aq) + Ba(NO3)2(aq) → Mg(NO3)2(aq) + BaSO4(s) 
E)  None of the above is an acid-base reaction.

Question 3

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 8.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

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 4

Which of the following compounds is an Arrhenius base?

Accepted Answer

A)  CH3CO2H 
B)  C6H5NH2 
C)  HNO2 
D)  H2SO4 
A)  CH3CO2H 
B)  C6H5NH2 
C)  HNO2 
D)  H2SO4

Question 5

Which of the following describes sugar?

Accepted Answer

A)  strong electrolyte, weak acid 
B)  weak electrolyte, weak acid 
C)  strong electrolyte, strong acid 
D)  weak electrolyte, strong acid 
E)  nonelectrolyte 
A)  strong electrolyte, weak acid 
B)  weak electrolyte, weak acid 
C)  strong electrolyte, strong acid 
D)  weak electrolyte, strong acid 
E)  nonelectrolyte

Question 6

Which of the compounds H2C2O4, Ca(OH)2, KOH, and H I behave as bases when they are dissolved in water?

Accepted Answer

A)  Ca(OH)2 and KOH 
B)  H2C2O4 and H I 
C)  only H I 
D)  only KOH 
A)  Ca(OH)2 and KOH 
B)  H2C2O4 and H I 
C)  only H I 
D)  only KOH

Question 7

How can you tell if a reaction is an oxidation-reduction reaction?

Accepted Answer

At least one species is losing electrons

Question 8

Balance the chemical equation given below, and determine the number of millilitres of 0.00300 mol L-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L-1 calcium hydroxide. 
________ Ca(OH)2(aq) + ________ H3PO4(aq) → ________ Ca3(PO4)2(aq) + ________ H2O(l)

Accepted Answer

A)  3.04 mL 
B)  15.0 mL 
C)  22.5 mL 
D)  33.8 mL 
A)  3.04 mL 
B)  15.0 mL 
C)  22.5 mL 
D)  33.8 mL

Question 9

How many grams of H3PO4 are in 265 mL of a 1.50 mol L-1 solution of H3PO4?

Accepted Answer

Question 10

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: Br O3- (aq) + H+(aq) → Br-(aq) + H2O(l)

Accepted Answer

A)  -7 
B)  -6 
C)  +6 
D)  +7 
A)  -7 
B)  -6 
C)  +6 
D)  +7

Question 11

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Accepted Answer

A)  2.81 moles NO 
B)  25.3 moles NO 
C)  8.44 moles NO 
D)  5.63 moles NO 
E)  1.83 moles NO 
A)  2.81 moles NO 
B)  25.3 moles NO 
C)  8.44 moles NO 
D)  5.63 moles NO 
E)  1.83 moles NO

Question 12

How many moles of CH3CH2OH are contained in 548 mL of a 0.0788 mol L-1 CH3CH2OH solution?

Accepted Answer

A)  4.32 × 10-2 mol 
B)  2.32 × 10-2 mol 
C)  6.95 × 10-2 mol 
D)  1.44 × 10-2 mol 
E)  5.26 × 10-2 mol 
A)  4.32 × 10-2 mol 
B)  2.32 × 10-2 mol 
C)  6.95 × 10-2 mol 
D)  1.44 × 10-2 mol 
E)  5.26 × 10-2 mol

Question 13

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 14

How many H+ ions can the acid H2SO4 donate per molecule?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
A)  0 
B)  1 
C)  2 
D)  3

Question 15

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L-1 solution of Al Br3 .

Accepted Answer

Question 16

Determine the oxidizing agent in the following reaction. 
Ni(s) + 2AgClO4(aq) → Ni(ClO4)2(aq) + 2Ag(s)

Accepted Answer

A)  Ag+ 
B)  Ni 
C)  Cl 
D)  O 
E)  This is not an oxidation-reduction reaction. 
A)  Ag+ 
B)  Ni 
C)  Cl 
D)  O 
E)  This is not an oxidation-reduction reaction.

Question 17

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

A)  NH4NO3 + Li2CO3 
B)  Hg2(NO3)2 + LiI 
C)  NaCl + Li3PO4 
D)  AgC2H3O2 + Cu(NO3)2 
E)  None of the above solution pairs will produce a precipitate. 
A)  NH4NO3 + Li2CO3 
B)  Hg2(NO3)2 + LiI 
C)  NaCl + Li3PO4 
D)  AgC2H3O2 + Cu(NO3)2 
E)  None of the above solution pairs will produce a precipitate.

Question 18

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Al and F2 in the balanced reaction? 
Al(s) + F2(g) → Al3+(aq) + F-(aq)

Accepted Answer

A)  Al = 2, F2 = 3 
B)  Al = 2, F2 = 6 
C)  Al = 1, F2 = 1 
D)  Al = 2, F2 = 1 
E)  Al = 3, F2 = 2 
A)  Al = 2, F2 = 3 
B)  Al = 2, F2 = 6 
C)  Al = 1, F2 = 1 
D)  Al = 2, F2 = 1 
E)  Al = 3, F2 = 2

Question 19

What element is being oxidized in the following (unbalanced) redox reaction? MnO4⁻ (aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

Accepted Answer

A)  C 
B)  O 
C)  Mn 
D)  H 
A)  C 
B)  O 
C)  Mn 
D)  H

Question 20

How many grams of NaOH (MW = 40.0) are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

Accepted Answer

Exam 4: Chemical Reactions and Stoichiometry

Which of the following solutions will have the highest electrical conductivity?

Which of the following is an acid-base reaction?

Identify the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 8.000 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

Which of the following compounds is an Arrhenius base?

Which of the following describes sugar?

Which of the compounds H2C2O4, Ca(OH)2, KOH, and H I behave as bases when they are dissolved in water?

How can you tell if a reaction is an oxidation-reduction reaction?

Balance the chemical equation given below, and determine the number of millilitres of 0.00300 mol L-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L-1 calcium hydroxide. ________ Ca(OH)2(aq) + ________ H3PO4(aq) → ________ Ca3(PO4)2(aq) + ________ H2O(l)

How many grams of H3PO4 are in 265 mL of a 1.50 mol L-1 solution of H3PO4?

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: Br O3- (aq) + H+(aq) → Br-(aq) + H2O(l)

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

How many moles of CH3CH2OH are contained in 548 mL of a 0.0788 mol L-1 CH3CH2OH solution?

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 H+ ions can the acid H2SO4 donate per molecule?

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L-1 solution of Al Br3 .

Determine the oxidizing agent in the following reaction. Ni(s) + 2AgClO4(aq) → Ni(ClO4)2(aq) + 2Ag(s)

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Al and F2 in the balanced reaction? Al(s) + F2(g) → Al3+(aq) + F-(aq)

What element is being oxidized in the following (unbalanced) redox reaction? MnO4⁻ (aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

How many grams of NaOH (MW = 40.0) are there in 250.0 mL of a 0.275 mol L-1 NaOH solution?

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Filters

Identify the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 8.000 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Which of the compounds H₂C₂O₄, Ca(OH)₂, KOH, and H I behave as bases when they are dissolved in water?

Balance the chemical equation given below, and determine the number of millilitres of 0.00300 mol L^-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L^-1 calcium hydroxide. Ca(OH)₂(aq) + H₃PO₄(aq) → Ca₃(PO₄)₂(aq) + H₂O(l)

How many grams of H₃PO₄ are in 265 mL of a 1.50 mol L^-1 solution of H₃PO₄?

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: BrO₃^-(aq) + H⁺(aq) → Br^-(aq) + H₂O(l)

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

How many moles of CH₃CH₂OH are contained in 548 mL of a 0.0788 mol L^-1 CH₃CH₂OH solution?

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 H⁺ ions can the acid H₂SO₄ donate per molecule?

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L^-1 solution of Al Br₃ .

Determine the oxidizing agent in the following reaction. Ni(s) + 2AgClO₄(aq) → Ni(ClO₄)₂(aq) + 2Ag(s)

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Aland F₂ in the balanced reaction? Al(s) + F₂(g) → Al³⁺(aq) + F^-(aq)

What element is being oxidized in the following (unbalanced) redox reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

How many grams of NaOH (MW = 40.0) are there in 250.0 mL of a 0.275 mol L^-1 NaOH solution?