Question 1

To dilute 1.00 L of a 0.600 M to 0.100 M,the final volume must be

Accepted Answer

A) 60 L. 
B) 0.7 L. 
C) 1/6 the original volume. 
D) More information is needed to answer this question. 
E) 6 times the original volume. 
A) 60 L. 
B) 0.7 L. 
C) 1/6 the original volume. 
D) More information is needed to answer this question. 
E) 6 times the original volume.

Question 2

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid?
Zn(s)+ 2H+(aq)+ 2Cl-(aq)→ Zn2+(aq)+ 2Cl-(aq)+ H2(g)

Accepted Answer

A) Zn(s)→ Zn2+(aq)+ 2e- 
B) 2H+(aq)+ 2e- → H2(g) 
C) 2H+(aq)+ 2e-(aq)→ H2(g)+ 2Cl-(aq) 
D) 2H+(aq)+ 2Cl-(aq)→ H2(g)+ 2e- + 2Cl-(aq) 
E) Zn(s)→ Zn2+(aq)+ 2Cl-(aq)+ 2e- 
A) Zn(s)→ Zn2+(aq)+ 2e- 
B) 2H+(aq)+ 2e- → H2(g) 
C) 2H+(aq)+ 2e-(aq)→ H2(g)+ 2Cl-(aq) 
D) 2H+(aq)+ 2Cl-(aq)→ H2(g)+ 2e- + 2Cl-(aq) 
E) Zn(s)→ Zn2+(aq)+ 2Cl-(aq)+ 2e-

Question 3

Which one of the following is necessary in order for a metal to be oxidized?

Accepted Answer

A) addition of electrons 
B) removal of electrons 
C) addition of oxygen 
D) removal of oxygen 
E) addition of hydrogen 
A) addition of electrons 
B) removal of electrons 
C) addition of oxygen 
D) removal of oxygen 
E) addition of hydrogen

Question 4

The reaction of HCl with NaOH is represented by the equation
HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l)
What volume of 0.417 M HCl is required to titrate 11.9 mL of 0.151 M NaOH?

Accepted Answer

A) 0.749 mL 
B) 2.39 mL 
C) 4.3 mL 
D) 11.9 mL 
E) 32.8 mL 
A) 0.749 mL 
B) 2.39 mL 
C) 4.3 mL 
D) 11.9 mL 
E) 32.8 mL

Question 5

The balanced net ionic equation for the reaction of calcium sulfite with nitric acid is

Accepted Answer

A) CaSO3(s)+ 2H+(aq)→ Ca2+(aq)+ SO2(g)+ H2O(l). 
B) Ca2+(aq)+ CO32-(aq)+ 2H+(aq)+ 2NO3-(aq)→ Ca(NO3)2(aq)+ SO2(g)+ H2O(l). 
C) CaSO3(s)+ 2HNO2(aq)→ Ca2+(aq)+ 2NO2-(aq)+ SO2(g)+ H2O(l). 
D) Ca(HSO3)2(s)+ 2HNO3(aq)→ Ca2+(aq)+ 2NO3-(aq)+ SO2(g)+ 2H2O(l). 
E) CaSO3(s)+ 2HNO3(aq)→ Ca2+(aq)+ 2NO3-(aq)+ SO2(g)+ H2O(l). 
A) CaSO3(s)+ 2H+(aq)→ Ca2+(aq)+ SO2(g)+ H2O(l). 
B) Ca2+(aq)+ CO32-(aq)+ 2H+(aq)+ 2NO3-(aq)→ Ca(NO3)2(aq)+ SO2(g)+ H2O(l). 
C) CaSO3(s)+ 2HNO2(aq)→ Ca2+(aq)+ 2NO2-(aq)+ SO2(g)+ H2O(l). 
D) Ca(HSO3)2(s)+ 2HNO3(aq)→ Ca2+(aq)+ 2NO3-(aq)+ SO2(g)+ 2H2O(l). 
E) CaSO3(s)+ 2HNO3(aq)→ Ca2+(aq)+ 2NO3-(aq)+ SO2(g)+ H2O(l).

Question 6

All of the following half-reactions are balanced except

Accepted Answer

A) NO3-(aq)+ 4H+(aq)+ 3e- → NO(g)+ 2H2O(l). 
B) H3PO3(aq)+ H2O(l)→ H3PO4(aq)+ 2H+(aq)+ 2e-. 
C) 2Ta(s)+ 5H2O(l)→ Ta2O5(s)+ 10H+(aq)+ 10e-. 
D) 2H2O(l)+ 2e- → H2(g)+ 2OH-(aq). 
E) H2O2(aq)→ 2OH-(aq)+ 2e-. 
A) NO3-(aq)+ 4H+(aq)+ 3e- → NO(g)+ 2H2O(l). 
B) H3PO3(aq)+ H2O(l)→ H3PO4(aq)+ 2H+(aq)+ 2e-. 
C) 2Ta(s)+ 5H2O(l)→ Ta2O5(s)+ 10H+(aq)+ 10e-. 
D) 2H2O(l)+ 2e- → H2(g)+ 2OH-(aq). 
E) H2O2(aq)→ 2OH-(aq)+ 2e-.

Question 7

All the following species can be reduced except

Accepted Answer

A) ClO2. 
B) F-. 
C) NO3-. 
D) H+. 
E) Fe3+. 
A) ClO2. 
B) F-. 
C) NO3-. 
D) H+. 
E) Fe3+.

Question 8

What is the net ionic equation for the acid-base reaction between chlorous acid and sodium hydroxide?

Accepted Answer

A) H+(aq)+ ClO2-(aq)+ Na+(aq)+ OH-(aq)→ NaClO2(aq)+ H2O(l) 
B) HClO2(aq)+ OH-(aq)→ ClO2-(aq)+ H2O(l) 
C) HClO2(aq)+ NaOH(aq)→ NaClO2(aq)+ H2O(l) 
D) H+(aq)+ OH-(aq)→ H2O(l) 
E) H+(aq)+ ClO2-(aq)+ Na+(aq)+ OH-(aq)→ Na+(aq)+ ClO2-(aq)+ H2O(l) 
A) H+(aq)+ ClO2-(aq)+ Na+(aq)+ OH-(aq)→ NaClO2(aq)+ H2O(l) 
B) HClO2(aq)+ OH-(aq)→ ClO2-(aq)+ H2O(l) 
C) HClO2(aq)+ NaOH(aq)→ NaClO2(aq)+ H2O(l) 
D) H+(aq)+ OH-(aq)→ H2O(l) 
E) H+(aq)+ ClO2-(aq)+ Na+(aq)+ OH-(aq)→ Na+(aq)+ ClO2-(aq)+ H2O(l)

Question 9

Which of the following reactions best describes the dissolution of solid KOH(s)in water?

Accepted Answer

A) KOH(s)+ H2O(l)→ KO-(aq)+ H3O+(aq) 
B) KOH(s)→ KO-(aq)+ H+(aq) 
C) KOH(s)→ K+(aq)+ OH-(aq) 
D) KOH(s)→ KO+(aq)+ H-(aq) 
E) KOH(s)→ KOH(aq) 
A) KOH(s)+ H2O(l)→ KO-(aq)+ H3O+(aq) 
B) KOH(s)→ KO-(aq)+ H+(aq) 
C) KOH(s)→ K+(aq)+ OH-(aq) 
D) KOH(s)→ KO+(aq)+ H-(aq) 
E) KOH(s)→ KOH(aq)

Question 10

Which of the following compounds is insoluble in water?

Accepted Answer

A) PbSO4 
B) ZnSO4 
C) Na2SO4 
D) (NH4)2SO4 
E) Cr2(SO4)3 
A) PbSO4 
B) ZnSO4 
C) Na2SO4 
D) (NH4)2SO4 
E) Cr2(SO4)3

Question 11

In a volumetric analysis experiment,an acidic aqueous solution of methanol (CH3OH)is titrated with a solution of potassium dichromate (K2Cr2O7)according to the following balanced chemical equation:
2K2Cr2O7(aq)+ 8H2SO4(aq)+ 3CH3OH(aq)→ 2Cr2(SO4)3(aq)+ 11H2O(l)+ 3HCOOH(aq)+ 2K2SO4(aq)
It required 49.73 mL of 0.0153 M K2Cr2O7 to reach the endpoint.What mass of CH3OH was present initially?

Accepted Answer

A) 0.0365 g 
B) 0.735 g 
C) 0.326 g 
D) 0.0243 g 
E) 0.0162 g 
A) 0.0365 g 
B) 0.735 g 
C) 0.326 g 
D) 0.0243 g 
E) 0.0162 g

Question 12

The oxidation number of nitrogen given for all the following species is correct except

Accepted Answer

A) N2H4 (-2). 
B) N2O (+1). 
C) NH2OH (-1). 
D) HNO2 (+3). 
E) HN3 (-1). 
A) N2H4 (-2). 
B) N2O (+1). 
C) NH2OH (-1). 
D) HNO2 (+3). 
E) HN3 (-1).

Question 13

The oxidation number of chromium in sodium chromite,NaCrO2,is

Accepted Answer

A) -1. 
B) -2. 
C) +2. 
D) +1. 
E) +3. 
A) -1. 
B) -2. 
C) +2. 
D) +1. 
E) +3.

Question 14

In a volumetric analysis experiment,an acidic aqueous solution of methanol (CH3OH)is titrated with a solution of potassium dichromate (K2Cr2O7)according to the following balanced chemical equation:
2K2Cr2O7(aq)+ 8H2SO4(aq)+ 3CH3OH(aq)→ 2Cr2(SO4)3(aq)+ 11H2O(l)+ 3HCOOH(aq)+ 2K2SO4(aq)
What volume of 0.00143 M K2Cr2O7 is required to titrate 1.90 g of CH3OH dissolved in 50.0 mL of solution?

Accepted Answer

A) 62.1 mL 
B) 1990 mL 
C) 27.6mL 
D) 50 mL 
E) 885 mL 
A) 62.1 mL 
B) 1990 mL 
C) 27.6mL 
D) 50 mL 
E) 885 mL

Question 15

A chemist has a sample of 1.88 M HCl.What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?

Accepted Answer

A) ​52.28 mL 
B) ​2.44 mL 
C) ​1.02 mL 
D) ​47.87 mL 
E) 0.46 mL 
A) ​52.28 mL 
B) ​2.44 mL 
C) ​1.02 mL 
D) ​47.87 mL 
E) 0.46 mL

Question 16

What is the net ionic equation for the complete neutralization of the triprotic acid citric acid,H3C6H5O6,by a strong base?

Accepted Answer

A) H3C6H5O6(aq)+ 3OH-(aq)→ 3H2O(l)+ C6H5O63-(aq) 
B) H3C6H5O6(aq)+ 3NaOH(aq)→ 3H2O(l)+ Na3C6H5O6(aq) 
C) H+(aq)+ OH-(aq)→ H2O(l) 
D) H3C6H5O6(aq)+ NaOH(aq)→ H2O(l)+ NaH2C6H5O6(aq) 
E) 3H+(aq)+ 3OH-(aq)→ 3H2O(l) 
A) H3C6H5O6(aq)+ 3OH-(aq)→ 3H2O(l)+ C6H5O63-(aq) 
B) H3C6H5O6(aq)+ 3NaOH(aq)→ 3H2O(l)+ Na3C6H5O6(aq) 
C) H+(aq)+ OH-(aq)→ H2O(l) 
D) H3C6H5O6(aq)+ NaOH(aq)→ H2O(l)+ NaH2C6H5O6(aq) 
E) 3H+(aq)+ 3OH-(aq)→ 3H2O(l)

Question 17

In the following oxidation-reduction reaction,
8H+(aq)+ 6Cl-(aq)+ Sn(s)+ 4NO3-(aq)→ SnCl62-(aq)+ 4NO2(g)+ 4H2O(l)
What is the oxidizing agent?

Accepted Answer

A) Sn 
B) NO3- 
C) H+ 
D) Cl- 
E) SnCl62- 
A) Sn 
B) NO3- 
C) H+ 
D) Cl- 
E) SnCl62-

Question 18

Which of the following is a weak acid in aqueous solution?

Accepted Answer

A) HCl 
B) H2SO4 
C) H2S 
D) HNO3 
E) HI 
A) HCl 
B) H2SO4 
C) H2S 
D) HNO3 
E) HI

Question 19

How many moles of KOH are present in 67.2 mL of 0.487 M KOH?

Accepted Answer

A)    mol 
B) 137 mol 
C)    mol 
D) 32.7 mol 
E) 0.487 mol 
A)    mol 
B) 137 mol 
C)    mol 
D) 32.7 mol 
E) 0.487 mol

Question 20

Aqueous solutions of sodium sulfide and copper(II)chloride are mixed together.Which statement is correct?

Accepted Answer

A) CuS will precipitate from solution. 
B) NaCl will precipitate from solution. 
C) No precipitate will form. 
D) Both NaCl and CuS will precipitate from solution. 
E) No reaction will occur. 
A) CuS will precipitate from solution. 
B) NaCl will precipitate from solution. 
C) No precipitate will form. 
D) Both NaCl and CuS will precipitate from solution. 
E) No reaction will occur.

Exam 4: Chemical Reactions

To dilute 1.00 L of a 0.600 M to 0.100 M,the final volume must be

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid? Zn(s)+ 2H+(aq)+ 2Cl-(aq)→ Zn2+(aq)+ 2Cl-(aq)+ H2(g)

Which one of the following is necessary in order for a metal to be oxidized?

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H2O(l) What volume of 0.417 M HCl is required to titrate 11.9 mL of 0.151 M NaOH?

The balanced net ionic equation for the reaction of calcium sulfite with nitric acid is

All of the following half-reactions are balanced except

All the following species can be reduced except

What is the net ionic equation for the acid-base reaction between chlorous acid and sodium hydroxide?

Which of the following reactions best describes the dissolution of solid KOH(s)in water?

Which of the following compounds is insoluble in water?

The oxidation number of nitrogen given for all the following species is correct except

The oxidation number of chromium in sodium chromite,NaCrO2,is

A chemist has a sample of 1.88 M HCl.What volume of the sample does he require to prepare 200 mL of 0.45 M HCl?

What is the net ionic equation for the complete neutralization of the triprotic acid citric acid,H3C6H5O6,by a strong base?

In the following oxidation-reduction reaction, 8H+(aq)+ 6Cl-(aq)+ Sn(s)+ 4NO3-(aq)→ SnCl62-(aq)+ 4NO2(g)+ 4H2O(l) What is the oxidizing agent?

Which of the following is a weak acid in aqueous solution?

How many moles of KOH are present in 67.2 mL of 0.487 M KOH?

Aqueous solutions of sodium sulfide and copper(II)chloride are mixed together.Which statement is correct?

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Filters

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid? Zn(s)+ 2H⁺(aq)+ 2Cl^-(aq)→ Zn²⁺(aq)+ 2Cl^-(aq)+ H₂(g)

The reaction of HCl with NaOH is represented by the equation HCl(aq)+ NaOH(aq)→ NaCl(aq)+ H₂O(l) What volume of 0.417 M HCl is required to titrate 11.9 mL of 0.151 M NaOH?

The oxidation number of chromium in sodium chromite,NaCrO₂,is

What is the net ionic equation for the complete neutralization of the triprotic acid citric acid,H₃C₆H₅O₆,by a strong base?

In the following oxidation-reduction reaction, 8H⁺(aq)+ 6Cl^-(aq)+ Sn(s)+ 4NO₃^-(aq)→ SnCl₆^2-(aq)+ 4NO₂(g)+ 4H₂O(l) What is the oxidizing agent?