Question 1

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False  False

Question 2

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) F1F1F1S1F1F1F10 H2O(l) + LiBr(aq)

Accepted Answer

A)  LiOH(aq) F1F1F1S1F1F1F10 Li+(aq) + OH-(aq) 
B)  HBr(aq) F1F1F1S1F1F1F10 H+(aq) + Br-(aq) 
C)  H+(aq) + OH-(aq) F1F1F1S1F1F1F10 H2O(l) 
D)  Li+(aq) + Br-(aq) F1F1F1S1F1F1F10 LiBr(aq) 
E)  Li+(aq) + OH-(aq) + H+(aq) + Br-(aq) F1F1F1S1F1F1F10 H2O(l) + LiBr(aq) 
A)  LiOH(aq) F1F1F1S1F1F1F10 Li+(aq) + OH-(aq) 
B)  HBr(aq) F1F1F1S1F1F1F10 H+(aq) + Br-(aq) 
C)  H+(aq) + OH-(aq) F1F1F1S1F1F1F10 H2O(l) 
D)  Li+(aq) + Br-(aq) F1F1F1S1F1F1F10 LiBr(aq) 
E)  Li+(aq) + OH-(aq) + H+(aq) + Br-(aq) F1F1F1S1F1F1F10 H2O(l) + LiBr(aq) C

Question 3

Which of the following will be least soluble in water?

Accepted Answer

A)  potassium sulfate, K2SO4 
B)  ammonium nitrate, NH4NO3 
C)  chloromethane, CH3Cl 
D)  calcium chloride, CaCl2 
E)  ethanol, C2H6O 
A)  potassium sulfate, K2SO4 
B)  ammonium nitrate, NH4NO3 
C)  chloromethane, CH3Cl 
D)  calcium chloride, CaCl2 
E)  ethanol, C2H6O C

Question 4

Some covalent compounds dissolve in water to produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 5

Select the classification for the following reaction. 2Na(s) + 2H2O(l) F1F1F1S1F1F1F10 2NaOH(aq) + H2(g)

Accepted Answer

A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  none of the above 
A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  none of the above

Question 6

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl2(aq) + Na2CO3(aq) F1F1F1S1F1F1F10

Accepted Answer

A)  copper(I) carbonate, Cu2CO3 
B)  copper(II) carbonate, Cu2CO3 
C)  copper(I) carbonate, CuCO3 
D)  copper(II) carbonate, CuCO3 
E)  sodium chloride, NaCl 
A)  copper(I) carbonate, Cu2CO3 
B)  copper(II) carbonate, Cu2CO3 
C)  copper(I) carbonate, CuCO3 
D)  copper(II) carbonate, CuCO3 
E)  sodium chloride, NaCl

Question 7

Select the correct set of products for the following reaction. Ba(OH)2(aq) + HNO3(aq) F1F1F1S1F1F1F10

Accepted Answer

A)  BaN2(s) + H2O(l) 
B)  Ba(NO3)2(aq) + H2O(l) 
C)  Ba(s) + H2(g) + NO2(g) 
D)  Ba2O(s) + NO2(g) + H2O(l) 
E)  No reaction occurs. 
A)  BaN2(s) + H2O(l) 
B)  Ba(NO3)2(aq) + H2O(l) 
C)  Ba(s) + H2(g) + NO2(g) 
D)  Ba2O(s) + NO2(g) + H2O(l) 
E)  No reaction occurs.

Question 8

Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 
2S2O32-(aq) + I2(aq) F1F1F1S1F1F1F10 S4O62-(aq) + 2I-(aq)

Accepted Answer

A)  I2(aq) 
B)  I-(aq) 
C)  S2O32-(aq) 
D)  S4O62-(aq) 
E)  S2O32-(aq) and I-(aq) 
A)  I2(aq) 
B)  I-(aq) 
C)  S2O32-(aq) 
D)  S4O62-(aq) 
E)  S2O32-(aq) and I-(aq)

Question 9

Predict the product(s) for the following reaction. Cl2O7(g) + H2O(l) F1F1F1S1F1F1F10

Accepted Answer

A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2 (aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq) 
A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2 (aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq)

Question 10

Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4)3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Accepted Answer

A)  KCl 
B)  Na2SO4 
C)  C6H12O6 
D)  CO2 
E)  (NH4)3PO4 
A)  KCl 
B)  Na2SO4 
C)  C6H12O6 
D)  CO2 
E)  (NH4)3PO4

Question 11

Which one of the following substances is a strong acid?

Accepted Answer

A)  HNO3 
B)  H2CO3 
C)  NH3 
D)  CH3COOH 
E)  H3PO4 
A)  HNO3 
B)  H2CO3 
C)  NH3 
D)  CH3COOH 
E)  H3PO4

Question 12

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

Accepted Answer

A)  sucrose, C12H22O11(aq) 
B)  sodium chloride, NaCl(aq) 
C)  potassium nitrate, KNO3(aq) 
D)  lithium hydroxide, LiOH(aq) 
E)  sulfuric acid, H2SO4(aq) 
A)  sucrose, C12H22O11(aq) 
B)  sodium chloride, NaCl(aq) 
C)  potassium nitrate, KNO3(aq) 
D)  lithium hydroxide, LiOH(aq) 
E)  sulfuric acid, H2SO4(aq)

Question 13

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

Accepted Answer

A)  1.66 × 1023 sodium ions 
B)  3.33 × 1023 sodium ions 
C)  4.99 × 1023 sodium ions 
D)  6.20 × 1023 sodium ions 
E)  1.57 × 1024 sodium ions 
A)  1.66 × 1023 sodium ions 
B)  3.33 × 1023 sodium ions 
C)  4.99 × 1023 sodium ions 
D)  6.20 × 1023 sodium ions 
E)  1.57 × 1024 sodium ions

Question 14

a. You are provided with a 250 mL volumetric flask, deionized water, and solid NaOH. How much NaOH should be weighed out in order to make 250. mL of 0.100 M solution?
b. 25.0 mL of the 0.100 M aqueous NaOH is titrated against sulfuric acid, H2SO4, according to the equation
2NaOH(aq) + H2SO4(aq) F1F1F1S1F1F1F10 Na2SO4(aq) + 2H2O(l)
If the volume of sulfuric acid solution required to neutralize the NaOH is 18.62 mL, what is its concentration?

Accepted Answer

a. 1.00 g

Question 15

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 M 
A)  1.99 M 
B)  1.50 M 
C)  1.12 M 
D)  0.502 M 
E)  0.00199 M

Question 16

Select the classification for the following reaction. 
BaCl2(aq) + K2SO4(aq) F1F1F1S1F1F1F10 BaSO4(s) + 2KCl(aq)

Accepted Answer

A)  precipitation 
B)  acid-base 
C)  redox 
D)  decomposition 
E)  none of the above 
A)  precipitation 
B)  acid-base 
C)  redox 
D)  decomposition 
E)  none of the above

Question 17

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 the above is the correct oxidation number. 
A)  +3 
B)  +5 
C)  +10 
D)  +15 
E)  None of the above is the correct oxidation number.

Question 18

What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Accepted Answer

A)  0.800 L 
B)  0.400 L 
C)  0.200 L 
D)  0.100 L 
E)  none of the above 
A)  0.800 L 
B)  0.400 L 
C)  0.200 L 
D)  0.100 L 
E)  none of the above

Question 19

a. A solution of common salt, NaCl, in water has a concentration of 0.0921 M. Calculate the number of moles of NaCl contained in 50.0 mL of this solution.
b. If, instead, an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250. mL of solution, what is the molarity?

Accepted Answer

a. 0.00461

Question 20

Ammonia, NH3, produces hydroxide ions in aqueous solution by

Accepted Answer

A)  donating a proton to an acid molecule. 
B)  donating a proton to a water molecule. 
C)  donating a hydrogen ion to a water molecule. 
D)  accepting an electron from an acid molecule. 
E)  accepting a proton from a water molecule. 
A)  donating a proton to an acid molecule. 
B)  donating a proton to a water molecule. 
C)  donating a hydrogen ion to a water molecule. 
D)  accepting an electron from an acid molecule. 
E)  accepting a proton from a water molecule.

Exam 4: The Major Classes of Chemical Reactions

All combustion reactions are classified as combination reactions.

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq)  H2O(l) + LiBr(aq)

Which of the following will be least soluble in water?

Some covalent compounds dissolve in water to produce conducting solutions.

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

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl2(aq) + Na2CO3(aq) 

Select the correct set of products for the following reaction. Ba(OH)2(aq) + HNO3(aq) 

Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32-(aq) + I2(aq)  S4O62-(aq) + 2I-(aq)

Predict the product(s) for the following reaction. Cl2O7(g) + H2O(l) 

Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4)3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Which one of the following substances is a strong acid?

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

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

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.

Select the classification for the following reaction. BaCl2(aq) + K2SO4(aq)  BaSO4(s) + 2KCl(aq)

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

What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Ammonia, NH3, produces hydroxide ions in aqueous solution by

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: Bonding, Structure, and Reactivity

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 net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq)  H₂O(l) + LiBr(aq)

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

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl₂(aq) + Na₂CO₃(aq) 

Select the correct set of products for the following reaction. Ba(OH)₂(aq) + HNO₃(aq) 

Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer"in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2-(aq) + I₂(aq)  S₄O₆^2-(aq) + 2I^-(aq)

Predict the product(s) for the following reaction. Cl₂O₇(g) + H₂O(l) 

Potassium chloride, KCl, sodium sulfate, Na₂SO₄, glucose, C₆H₁₂O₆, carbon dioxide, CO₂ and ammonium phosphate, (NH₄)₃PO₄, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

Select the classification for the following reaction. BaCl₂(aq) + K₂SO₄(aq)  BaSO₄(s) + 2KCl(aq)

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

Ammonia, NH₃, produces hydroxide ions in aqueous solution by