Question 1

A solution is prepared by mixing 20.0 mL of 0.100 M HCl and 5.00 mL of 0.200 M NaCl.What is the molarity of chloride ion in this solution?

Accepted Answer

A)  0.180 
B)  8.33 
C)  1.50 
D)  0.0400 
E)  0.120 
A)  0.180 
B)  8.33 
C)  1.50 
D)  0.0400 
E)  0.120

Question 2

How many moles of Na F are contained in 258.6 mL of 0.0296 M Na F solution?

Accepted Answer

A)  1.31 × 10-3 mol 
B)  8.74 × 10-3 mol 
C)  1.14 × 10-3 mol 
D)  3.67 × 10-3 mol 
E)  7.65 × 10-3 mol 
A)  1.31 × 10-3 mol 
B)  8.74 × 10-3 mol 
C)  1.14 × 10-3 mol 
D)  3.67 × 10-3 mol 
E)  7.65 × 10-3 mol

Question 3

Identify the oxidation state of H in H F(aq). Ca(s)+ 2H F(aq)→ Ca F2(aq)+ H2(g)

Accepted Answer

A)  +1 
B)  +2 
C)  0 
D)  -1 
E)  -2 
A)  +1 
B)  +2 
C)  0 
D)  -1 
E)  -2

Question 4

Identify the oxidation state of H in H2(g). Mg(s)+ 2H Br(aq)→ Mg Br2(aq)+ H2(g)

Accepted Answer

A)  +1 
B)  +2 
C)  0 
D)  -1 
E)  -2 
A)  +1 
B)  +2 
C)  0 
D)  -1 
E)  -2

Question 5

What is the oxidation number change for the manganese atom in the following unbalanced reduction half reaction?

Accepted Answer

A)  -7 
B)  -5 
C)  +5 
D)  +7 
A)  -7 
B)  -5 
C)  +5 
D)  +7

Question 6

Which of the compounds of H CO2H , Ba(OH)2,CsOH,and H Br,behave as acids when they are dissolved in water?

Accepted Answer

A)  Ba(OH)2 and CsOH 
B)      H and H Br 
C)  only H Br 
D)  only CsOH 
A)  Ba(OH)2 and CsOH 
B)      H and H Br 
C)  only H Br 
D)  only CsOH

Question 7

Determine the reducing agent in the following reaction. 2 Li(s)+ Fe(C2H3O2)2(aq)→ 2 LiC2H3O2(aq)+ Fe(s)

Accepted Answer

A)  O 
B)  H 
C)  C 
D)  Fe 
E)  Li 
A)  O 
B)  H 
C)  C 
D)  Fe 
E)  Li

Question 8

What is the oxidation number of the sulfur atom in Li2SO4 ?

Accepted Answer

A)  -2 
B)  +2 
C)  +4 
D)  +6 
A)  -2 
B)  +2 
C)  +4 
D)  +6

Question 9

Which of the following is an acid-base reaction?

Accepted Answer

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

Question 10

What is the concentration (M)of a NaCl solution prepared by dissolving 5.3 g of NaCl in sufficient water to give 115 mL of solution?

Accepted Answer

The answer of What is the concentration (M)of a NaCl...

Question 11

Calculate the number of grams of solute in 250.0 mL of 0.179 M KOH.

Accepted Answer

A)  78.4 
B)  0.798 
C)  2.51 ×   
D)  2.51 
E)  7.98 × 10-4 
A)  78.4 
B)  0.798 
C)  2.51 ×   
D)  2.51 
E)  7.98 × 10-4

Question 12

How many milliliters of 0.200 M FeCl3 are needed to react with an excess of Na2S to produce 2.75 g of Fe2S3 if the percent yield for the reaction is 65.0%?
3 Na2S(aq)+ 2 FeCl3(aq)→ Fe2S3(s)+ 6 NaCl(aq)

Accepted Answer

A)  50.9 mL 
B)  86.0 mL 
C)  102 mL 
D)  204 mL 
A)  50.9 mL 
B)  86.0 mL 
C)  102 mL 
D)  204 mL

Question 13

Identify HCl.

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 14

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of lithium sulfide and copper (II)nitrate are mixed.

Accepted Answer

A)  Li+(aq) + SO42-(aq) + Cu+(aq) + NO3-(aq) → CuS(s) + Li+(aq) + NO3-(aq) 
B)  Li+(aq) + S-(aq) + Cu+(aq) + NO3-(aq) → CuS(s) + LiNO3(aq) 
C)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → Cu2+(aq) + S2-(aq) + 2 LiNO3(s) 
D)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 Li+(aq) + 2 NO3-(aq) 
E)  No reaction occurs. 
A)  Li+(aq) + SO42-(aq) + Cu+(aq) + NO3-(aq) → CuS(s) + Li+(aq) + NO3-(aq) 
B)  Li+(aq) + S-(aq) + Cu+(aq) + NO3-(aq) → CuS(s) + LiNO3(aq) 
C)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → Cu2+(aq) + S2-(aq) + 2 LiNO3(s) 
D)  2 Li+(aq) + S2-(aq) + Cu2+(aq) + 2 NO3-(aq) → CuS(s) + 2 Li+(aq) + 2 NO3-(aq) 
E)  No reaction occurs.

Question 15

If 42.389 g of Fe3Br2 is dissolved in enough water to give a total volume of 750 mL,what is the molarity of the solution?

Accepted Answer

A)  0.327 M 
B)  0.0971 M 
C)  0.0327 M 
D)  0.173M 
E)  0.436 M 
A)  0.327 M 
B)  0.0971 M 
C)  0.0327 M 
D)  0.173M 
E)  0.436 M

Question 16

Determine the oxidizing agent in the following reaction. Ni(s)+ 2 AgClO4(aq)→ Ni(ClO4)2(aq)+ 2 Ag(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 compounds is an Arrhenius base?

Accepted Answer

A)  CH3OH 
B)  CH3CO2H 
C)  HOCl 
D)  SrOH 
A)  CH3OH 
B)  CH3CO2H 
C)  HOCl 
D)  SrOH

Question 18

Which of the following solutions will have the highest concentration of chloride ions?

Accepted Answer

A)  0.10 M NaCl 
B)  0.10 M MgCl2 
C)  0.10 M AlCl3 
D)  0.05 M CaCl2 
E)  All of these solutions have the same concentration of chloride ions. 
A)  0.10 M NaCl 
B)  0.10 M MgCl2 
C)  0.10 M AlCl3 
D)  0.05 M CaCl2 
E)  All of these solutions have the same concentration of chloride ions.

Question 19

Determine the number of grams H2 formed when 250.0 mL of 0.743 M HCl solution reacts with 3.41 × 1023 atoms of Fe according to the following reaction. 2 HCl(aq)+ Fe(s)→ H2(g)+ FeCl2(aq)

Accepted Answer

A)  0.374 g 
B)  1.33 g 
C)  1.14 g 
D)  0.187 g 
E)  1.51 g 
A)  0.374 g 
B)  1.33 g 
C)  1.14 g 
D)  0.187 g 
E)  1.51 g

Question 20

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

A)  Mg(NO3)2(aq) + Na2CO3(aq) 
B)  K2SO4(aq) + Cu(NO3)2(aq) 
C)  NaClO4(aq) + (NH4)2S(aq) 
D)  NH4Br(aq) + NH4I(aq) 
A)  Mg(NO3)2(aq) + Na2CO3(aq) 
B)  K2SO4(aq) + Cu(NO3)2(aq) 
C)  NaClO4(aq) + (NH4)2S(aq) 
D)  NH4Br(aq) + NH4I(aq)

Exam 9: Introduction to Solutions and Aqueous Reactions

A solution is prepared by mixing 20.0 mL of 0.100 M HCl and 5.00 mL of 0.200 M NaCl.What is the molarity of chloride ion in this solution?

How many moles of Na F are contained in 258.6 mL of 0.0296 M Na F solution?

Identify the oxidation state of H in H F(aq). Ca(s)+ 2H F(aq)→ Ca F2(aq)+ H2(g)

Identify the oxidation state of H in H2(g). Mg(s)+ 2H Br(aq)→ Mg Br2(aq)+ H2(g)

What is the oxidation number change for the manganese atom in the following unbalanced reduction half reaction?

Which of the compounds of H CO2H , Ba(OH)2,CsOH,and H Br,behave as acids when they are dissolved in water?

Determine the reducing agent in the following reaction. 2 Li(s)+ Fe(C2H3O2)2(aq)→ 2 LiC2H3O2(aq)+ Fe(s)

What is the oxidation number of the sulfur atom in Li2SO4 ?

Which of the following is an acid-base reaction?

What is the concentration (M)of a NaCl solution prepared by dissolving 5.3 g of NaCl in sufficient water to give 115 mL of solution?

Calculate the number of grams of solute in 250.0 mL of 0.179 M KOH.

How many milliliters of 0.200 M FeCl3 are needed to react with an excess of Na2S to produce 2.75 g of Fe2S3 if the percent yield for the reaction is 65.0%? 3 Na2S(aq)+ 2 FeCl3(aq)→ Fe2S3(s)+ 6 NaCl(aq)

Identify HCl.

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of lithium sulfide and copper (II)nitrate are mixed.

If 42.389 g of Fe3Br2 is dissolved in enough water to give a total volume of 750 mL,what is the molarity of the solution?

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

Which of the following compounds is an Arrhenius base?

Which of the following solutions will have the highest concentration of chloride ions?

Determine the number of grams H2 formed when 250.0 mL of 0.743 M HCl solution reacts with 3.41 × 1023 atoms of Fe according to the following reaction. 2 HCl(aq)+ Fe(s)→ H2(g)+ FeCl2(aq)

The mixing of which pair of reactants will result in a precipitation 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

Chemical Reactions and Chemical Quantities

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

Identify the oxidation state of H in H F(aq). Ca(s)+ 2H F(aq)→ Ca F₂(aq)+ H₂(g)

Identify the oxidation state of H in H₂(g). Mg(s)+ 2H Br(aq)→ Mg Br₂(aq)+ H₂(g)

Which of the compounds of HCO₂H_, Ba(OH)₂,CsOH,and H Br,behave as acids when they are dissolved in water?

Determine the reducing agent in the following reaction. 2 Li(s)+ Fe(C₂H₃O₂)₂(aq)→ 2 LiC₂H₃O₂(aq)+ Fe(s)

What is the oxidation number of the sulfur atom in Li₂SO₄?

How many milliliters of 0.200 M FeCl₃ are needed to react with an excess of Na₂S to produce 2.75 g of Fe₂S₃ if the percent yield for the reaction is 65.0%? 3 Na₂S(aq)+ 2 FeCl₃(aq)→ Fe₂S₃(s)+ 6 NaCl(aq)

If 42.389 g of Fe₃Br₂ is dissolved in enough water to give a total volume of 750 mL,what is the molarity of the solution?

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

Determine the number of grams H₂ formed when 250.0 mL of 0.743 M HCl solution reacts with 3.41 × 10²³ atoms of Fe according to the following reaction. 2 HCl(aq)+ Fe(s)→ H₂(g)+ FeCl₂(aq)