Question 1

Select the precipitate that forms when the following reactants are mixed. Na2CO3(aq) + BaCl2(aq) $\rightarrow$

Accepted Answer

A)  Ba2CO3 
B)  BaCO3 
C)  NaCl 
D)  NaCl2 
E)  BaO 
A)  Ba2CO3 
B)  BaCO3 
C)  NaCl 
D)  NaCl2 
E)  BaO

Question 2

Which of the following is a weak base?

Accepted Answer

A)  NH3 
B)  Ca(OH)2 
C)  Ba(OH)2 
D)  NaOH 
E)  CH3COOH 
A)  NH3 
B)  Ca(OH)2 
C)  Ba(OH)2 
D)  NaOH 
E)  CH3COOH

Question 3

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

Question 4

Predict the products by completing a balanced equation for the following decomposition reaction.

Accepted Answer

A)  CaCl2(l)   Ca(l) + 2Cl¯(l) 
B)  CaCl2(l)   Ca2+(l) + Cl2(g) 
C)  CaCl2(l)   Ca2+(l) + 2Cl¯(l) 
D)  CaCl2(l)   Ca(l) + Cl2(g) 
E)  CaCl2(l)   CaCl(l) + Cl¯(l) 
A)  CaCl2(l)   Ca(l) + 2Cl¯(l) 
B)  CaCl2(l)   Ca2+(l) + Cl2(g) 
C)  CaCl2(l)   Ca2+(l) + 2Cl¯(l) 
D)  CaCl2(l)   Ca(l) + Cl2(g) 
E)  CaCl2(l)   CaCl(l) + Cl¯(l)

Question 5

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) $\rightarrow$NaNO3(aq) + Hg2Cl2(s)

Accepted Answer

A)  Na+(aq) + NO3¯(aq) $\rightarrow$ NaNO3(aq) 
B)  Hg22+(aq) + 2Cl¯(aq)$\rightarrow$Hg2Cl2(s) 
C)  NaCl(aq) $\rightarrow$Na+(aq) + Cl¯(aq) 
D)  Hg2(NO3)2(aq) $\rightarrow$Hg22+(aq) + 2NO3¯(aq) 
E)  Hg22+(aq) $\rightarrow$Hg2(s) 
A)  Na+(aq) + NO3¯(aq) $\rightarrow$ NaNO3(aq) 
B)  Hg22+(aq) + 2Cl¯(aq)$\rightarrow$Hg2Cl2(s) 
C)  NaCl(aq) $\rightarrow$Na+(aq) + Cl¯(aq) 
D)  Hg2(NO3)2(aq) $\rightarrow$Hg22+(aq) + 2NO3¯(aq) 
E)  Hg22+(aq) $\rightarrow$Hg2(s)

Question 6

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 7

The amount of calcium present in milk can be determined by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium if 0.429 g of calcium oxalate forms in a 125-g sample of milk when excess aqueous sodium oxalate is added? Na2C2O4(aq) + Ca2+(aq) $\rightarrow$CaC2O4(s) + 2Na+(aq)

Accepted Answer

A)  0.107% 
B)  0.202% 
C)  0.343% 
D)  1.10% 
E)  1.37% 
A)  0.107% 
B)  0.202% 
C)  0.343% 
D)  1.10% 
E)  1.37%

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Select the classification for the following reaction: H2(g) + Cl2(g) $\rightarrow$2HCl(g)

Accepted Answer

A)  combination 
B)  decomposition 
C)  displacement 
D)  acid-base 
E)  None of these choices is correct. 
A)  combination 
B)  decomposition 
C)  displacement 
D)  acid-base 
E)  None of these choices is correct.

Question 11

Predict the product(s) for the following reaction:

Accepted Answer

A)  Ba(s) + CO3(g) 
B)  BaCO3(s) 
C)  BaO(s) + C(s) 
D)  Ba(s) + CO32¯(s) 
E)  No reaction occurs. 
A)  Ba(s) + CO3(g) 
B)  BaCO3(s) 
C)  BaO(s) + C(s) 
D)  Ba(s) + CO32¯(s) 
E)  No reaction occurs.

Question 12

Which one of the following substances is the best electrolyte?

Accepted Answer

A)  CO 
B)  CH3Cl 
C)  CH4 
D)  C2H5OH 
E)  HCl 
A)  CO 
B)  CH3Cl 
C)  CH4 
D)  C2H5OH 
E)  HCl

Question 13

Oxidation is associated with an increase in oxidation number.

Accepted Answer

A) True 
 B)False

Question 14

1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

Accepted Answer

A)  NaOH 
B)  CH3CH2OH (ethanol) 
C)  KBr 
D)  CH3COOH (acetic acid) 
E)  HClO4 
A)  NaOH 
B)  CH3CH2OH (ethanol) 
C)  KBr 
D)  CH3COOH (acetic acid) 
E)  HClO4

Question 15

Balance the redox equation 
$ \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}(a q)+\mathrm{HI}(a q) \rightarrow \mathrm{KI}(a q)+\mathrm{CrI}_{3}(a q)+\mathrm{I}_{2}(s)+\mathrm{H}_{2} \mathrm{O}(l) $

Accepted Answer

The answer of Balance the redox equation 
\( \mathrm{K}_{2} \mathrm{Cr}_{2}...

Question 16

Which of the following is a weak acid?

Accepted Answer

A)  H2SO4 
B)  HNO3 
C)  HF 
D)  HBr 
E)  HCl 
A)  H2SO4 
B)  HNO3 
C)  HF 
D)  HBr 
E)  HCl

Question 17

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

Accepted Answer

A)  only K+ 
B)  only SO42¯ 
C)  only K+ and SO42¯ 
D)  only K+, SO42¯ and Fe2+ 
E)  only K+, SO42¯, Fe2+ and Mn2+ 
A)  only K+ 
B)  only SO42¯ 
C)  only K+ and SO42¯ 
D)  only K+, SO42¯ and Fe2+ 
E)  only K+, SO42¯, Fe2+ and Mn2+

Question 18

Covalent compounds, dissolved in water, never produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 19

Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq) $\rightarrow$

Accepted Answer

A)  LiCH3COO 
B)  Li(CH3COO)2 
C)  MgOH 
D)  Mg(OH)2 
E)  CH3OH 
A)  LiCH3COO 
B)  Li(CH3COO)2 
C)  MgOH 
D)  Mg(OH)2 
E)  CH3OH

Question 20

A) Define "oxidation."
B) Identify the oxidizing and reducing agents in the following (unbalanced) equation. $ \mathrm{HNO}_{3}(a q)+\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}(a q)+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}(a q) \rightarrow $
$ \mathrm{KNO}_{3}(a q)+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(a q)+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Cr}\left(\mathrm{NO}_{3}\right)_{3}(a q) $

Accepted Answer

a. Oxidation: loss of electron

Exam 4: Three Major Classes of Chemical Reactions

Select the precipitate that forms when the following reactants are mixed. Na2CO3(aq) + BaCl2(aq) →\rightarrow→

Which of the following is a weak base?

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?

Predict the products by completing a balanced equation for the following decomposition reaction.

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) →\rightarrow→ NaNO3(aq) + Hg2Cl2(s)

A combination reaction may also be a displacement reaction.

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

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

Select the classification for the following reaction: H2(g) + Cl2(g) →\rightarrow→ 2HCl(g)

Predict the product(s) for the following reaction:

Which one of the following substances is the best electrolyte?

Oxidation is associated with an increase in oxidation number.

1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

Which of the following is a weak acid?

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

Covalent compounds, dissolved in water, never produce conducting solutions.

Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq) →\rightarrow→

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the precipitate that forms when the following reactants are mixed. Na₂CO₃(aq) + BaCl₂(aq) $\rightarrow$

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg₂(NO₃)₂(aq) $\rightarrow$ NaNO₃(aq) + Hg₂Cl₂(s)

Select the classification for the following reaction: H₂(g) + Cl₂(g) $\rightarrow$ 2HCl(g)

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

Select the precipitate that forms when the following reactants are mixed. Mg(CH₃COO)₂(aq) + LiOH(aq) $\rightarrow$