Question 1

What mass of Li3PO4 is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

Accepted Answer

A) 6.75 g 
B) 10.1 g 
C) 19.3 g 
D) 30.4 g 
E) 3.38 g 
A) 6.75 g 
B) 10.1 g 
C) 19.3 g 
D) 30.4 g 
E) 3.38 g E

Question 2

Identify the correct net ionic equation for the reaction that occurs when solutions of Ba(ClO4)2 and K2SO4 are mixed.

Accepted Answer

A) Ba2+(aq)+ SO42-(aq)$\rarr$ BaSO4(s) 
B) 2K+(aq)+ 2ClO4-(aq)$\rarr$K2(ClO4)2(s) 
C) K+(aq)+ ClO4-(aq)$\rarr$ KClO4(s) 
D) Ba(ClO4)2(aq)+ K2SO4(aq)$\rarr$ BaSO4(s)+ 2KClO4(s) 
E) Ba2+(aq)+ K+(aq)+ SO42-(aq)$\rarr$ KBaSO4(s) 
A) Ba2+(aq)+ SO42-(aq)$\rarr$ BaSO4(s) 
B) 2K+(aq)+ 2ClO4-(aq)$\rarr$K2(ClO4)2(s) 
C) K+(aq)+ ClO4-(aq)$\rarr$ KClO4(s) 
D) Ba(ClO4)2(aq)+ K2SO4(aq)$\rarr$ BaSO4(s)+ 2KClO4(s) 
E) Ba2+(aq)+ K+(aq)+ SO42-(aq)$\rarr$ KBaSO4(s) A

Question 3

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide.What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750.mL of water?

Accepted Answer

A) 1.06 M 
B) 0.528 M 
C) 2.11 M 
D) 0.792 M 
E) 0.943 M 
A) 1.06 M 
B) 0.528 M 
C) 2.11 M 
D) 0.792 M 
E) 0.943 M A

Question 4

What type of reaction is the following? 
Ca(OH)2(s)+ 2 HNO3(aq)$\rarr$Ca(NO3)2(aq)+ 2 H2O(l)

Accepted Answer

A) Combination reaction 
B) Acid-base neutralization reaction 
C) Hydrogen displacement reaction 
D) Disproportionation reaction 
E) Combustion reaction 
A) Combination reaction 
B) Acid-base neutralization reaction 
C) Hydrogen displacement reaction 
D) Disproportionation reaction 
E) Combustion reaction

Question 5

Zinc dissolves in hydrochloric acid to yield hydrogen gas: 
Zn(s)+ 2HCl(aq)$\rarr$ZnCl2(aq)+ H2(g)
When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

Accepted Answer

A) 0.776 M 
B) 0.388 M 
C) 0.674 M 
D) 1.06 M 
E) 0 M 
A) 0.776 M 
B) 0.388 M 
C) 0.674 M 
D) 1.06 M 
E) 0 M

Question 6

One method of determining the concentration of hydrogen peroxide (H2O2)in a solution is through titration with the iodide ion.The net ionic equation for this reaction is H2O2 + 2I- +2H+ $\rarr$ I2 + 2H2O
A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution.What is the concentration of hydrogen peroxide in the sample?

Accepted Answer

A) 5.568 × 10-2 M 
B) 0.2227 M 
C) 0.1010 M 
D) 0.4041 M 
E) 0.1114 M 
A) 5.568 × 10-2 M 
B) 0.2227 M 
C) 0.1010 M 
D) 0.4041 M 
E) 0.1114 M

Question 7

A piece of copper metal was added to an aqueous solution of silver nitrate, and within a few minutes it was observed that a grey crystalline solid formed on surface of the copper.The solution turned a blue color characteristic of copper(II)ions.Write the net ionic equation for this reaction.

Accepted Answer

Cu(s)+ 2Ag

Question 8

When 38.0 mL of 0.1250 M H2SO4 is added to 100.mL of a solution of PbI2, a precipitate of PbSO4 forms.The PbSO4 is then filtered from the solution, dried, and weighed.If the recovered PbSO4 is found to have a mass of 0.0471 g, what was the concentration of iodide ions in the original solution?

Accepted Answer

A) 3.10 × 10-4 M 
B) 1.55 × 10-4 M 
C) 6.20 × 10-3 M 
D) 3.11 × 10-3 M 
E) 1.55 × 10-3 M 
A) 3.10 × 10-4 M 
B) 1.55 × 10-4 M 
C) 6.20 × 10-3 M 
D) 3.11 × 10-3 M 
E) 1.55 × 10-3 M

Question 9

Which of the following compounds is a weak base?

Accepted Answer

A) KOH 
B) Sc(OH)3 
C) NH3 
D) NH4+ 
E) CO2 
A) KOH 
B) Sc(OH)3 
C) NH3 
D) NH4+ 
E) CO2

Question 10

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction.
CH4(g)+ 2 O2(g)$\rarr$CO2(g)+ 2 H2O(g)

Accepted Answer

Question 11

Thorium metal is prepared by reacting thorium oxide with calcium as depicted below.
ThO2 + 2Ca $\rarr$ Th + 2CaO
What is the reducing agent in this process?

Accepted Answer

Question 12

Determine the correct oxidation numbers for all three elements in Rb2SO3 in the order that the elements are shown in the formula.

Accepted Answer

A) -2, +6, -2 
B) -1, +4, -3 
C) +2, +4, -2 
D) +1, +4, -2 
E) +1, +6, -6 
A) -2, +6, -2 
B) -1, +4, -3 
C) +2, +4, -2 
D) +1, +4, -2 
E) +1, +6, -6

Question 13

A weak acid or a weak base ionizes completely.

Accepted Answer

A) True 
 B)False

Question 14

Zinc dissolves in hydrochloric acid to yield hydrogen gas: 
Zn(s)+ 2HCl(aq)$\rarr$ ZnCl2(aq)+ H2(g)
What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Accepted Answer

A) 0.605 g 
B) 0.113 g 
C) 0.302 g 
D) 0.453 g 
E) 0.227 g 
A) 0.605 g 
B) 0.113 g 
C) 0.302 g 
D) 0.453 g 
E) 0.227 g

Question 15

Identify the correct net ionic equation for the reaction that occurs when solutions of AgNO3 and NH4Cl are mixed.

Accepted Answer

A) AgNO3(aq)+ NH4Cl(aq)$\rarr$AgCl(s)+ NH4Cl(aq) 
B) NH4+(aq)+ NO3-(aq)$\rarr$NH4NO3(s) 
C) AgNO3(aq)+ NH4Cl(aq)$\rarr$AgCl(s)+ NH4Cl(s) 
D) Ag+(aq)+ Cl-(aq)$\rarr$ AgCl(s) 
E) AgNO3(aq)+ NH4+(aq)$\rarr$NH4AgNO3(s) 
A) AgNO3(aq)+ NH4Cl(aq)$\rarr$AgCl(s)+ NH4Cl(aq) 
B) NH4+(aq)+ NO3-(aq)$\rarr$NH4NO3(s) 
C) AgNO3(aq)+ NH4Cl(aq)$\rarr$AgCl(s)+ NH4Cl(s) 
D) Ag+(aq)+ Cl-(aq)$\rarr$ AgCl(s) 
E) AgNO3(aq)+ NH4+(aq)$\rarr$NH4AgNO3(s)

Question 16

A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL.What is the ammonium nitrate concentration in the resulting solution?

Accepted Answer

A) 21.8 M 
B) 0.459 M 
C) 2.18 × 10-2 M 
D) 8.72 × 10-2 M 
E) 0.109 M 
A) 21.8 M 
B) 0.459 M 
C) 2.18 × 10-2 M 
D) 8.72 × 10-2 M 
E) 0.109 M

Question 17

A piece of lead metal was added to an aqueous solution of copper(II)nitrate, and within a few minutes it was observed that the lead turned black and crumbled.The characteristic blue solution of copper(II)ions had faded.(NOTE: Lead forms a 2+ ion when it reacts.)Write the net ionic equation for this reaction.

Accepted Answer

Pb(s)+ Cu²⁺(

Question 18

Which of the following represents a hydrogen displacement reaction?

Accepted Answer

A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) 2KBr(aq)+ Cl2(g)$\rarr$2KCl(aq)+ Br2(l) 
C) N2(g)+ 3H2(g)$\rarr$2NH3(g) 
D) CaBr2(aq)+ H2SO4(aq)$\rarr$ CaSO4(s)+ 2HBr(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g) 
A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) 2KBr(aq)+ Cl2(g)$\rarr$2KCl(aq)+ Br2(l) 
C) N2(g)+ 3H2(g)$\rarr$2NH3(g) 
D) CaBr2(aq)+ H2SO4(aq)$\rarr$ CaSO4(s)+ 2HBr(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g)

Question 19

For the perchlorate ion ClO4- , what are the oxidation states of the Cl and O, respectively?

Accepted Answer

A) - 1, - 2 
B) +8, - 2 
C) +7, - 2 
D) +6, - 2 
E) +2, - 1 
A) - 1, - 2 
B) +8, - 2 
C) +7, - 2 
D) +6, - 2 
E) +2, - 1

Question 20

Write a balanced molecular equation for the reaction that occurs when aqueous solutions of potassium iodide and lead(II)nitrate are combined.

Accepted Answer

2KI(aq)+ P

Exam 4: Reactions in Aqueous Solutions

What mass of Li3PO4 is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

Identify the correct net ionic equation for the reaction that occurs when solutions of Ba(ClO4)2 and K2SO4 are mixed.

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide.What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750.mL of water?

What type of reaction is the following? Ca(OH)2(s)+ 2 HNO3(aq) →\rarr→ Ca(NO3)2(aq)+ 2 H2O(l)

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq) →\rarr→ ZnCl2(aq)+ H2(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

A piece of copper metal was added to an aqueous solution of silver nitrate, and within a few minutes it was observed that a grey crystalline solid formed on surface of the copper.The solution turned a blue color characteristic of copper(II)ions.Write the net ionic equation for this reaction.

When 38.0 mL of 0.1250 M H2SO4 is added to 100.mL of a solution of PbI2, a precipitate of PbSO4 forms.The PbSO4 is then filtered from the solution, dried, and weighed.If the recovered PbSO4 is found to have a mass of 0.0471 g, what was the concentration of iodide ions in the original solution?

Which of the following compounds is a weak base?

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. CH4(g)+ 2 O2(g) →\rarr→ CO2(g)+ 2 H2O(g)

Thorium metal is prepared by reacting thorium oxide with calcium as depicted below. ThO2 + 2Ca →\rarr→ Th + 2CaO What is the reducing agent in this process?

Determine the correct oxidation numbers for all three elements in Rb2SO3 in the order that the elements are shown in the formula.

A weak acid or a weak base ionizes completely.

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq) →\rarr→ ZnCl2(aq)+ H2(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Identify the correct net ionic equation for the reaction that occurs when solutions of AgNO3 and NH4Cl are mixed.

A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL.What is the ammonium nitrate concentration in the resulting solution?

Which of the following represents a hydrogen displacement reaction?

For the perchlorate ion ClO4- , what are the oxidation states of the Cl and O, respectively?

Write a balanced molecular equation for the reaction that occurs when aqueous solutions of potassium iodide and lead(II)nitrate are combined.

Chemistry: the Study of Change

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Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

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Physical Properties of Solutions

Chemical Kinetics

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Acid-Base Equilibria and Solubility Equilibria

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Filters

What mass of Li₃PO₄ is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

Identify the correct net ionic equation for the reaction that occurs when solutions of Ba(ClO₄)₂ and K₂SO₄ are mixed.

What type of reaction is the following? Ca(OH)₂(s)+ 2 HNO₃(aq) $\rarr$ Ca(NO₃)₂(aq)+ 2 H₂O(l)

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq) $\rarr$ ZnCl₂(aq)+ H₂(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. CH₄(g)+ 2 O₂(g) $\rarr$ CO₂(g)+ 2 H₂O(g)

Thorium metal is prepared by reacting thorium oxide with calcium as depicted below. ThO₂ + 2Ca $\rarr$ Th + 2CaO What is the reducing agent in this process?

Determine the correct oxidation numbers for all three elements in Rb₂SO₃ in the order that the elements are shown in the formula.

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq) $\rarr$ ZnCl₂(aq)+ H₂(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Identify the correct net ionic equation for the reaction that occurs when solutions of AgNO₃ and NH₄Cl are mixed.

A 50.0 mL sample of 0.436 M NH₄NO₃ is diluted with water to a total volume of 250.0 mL.What is the ammonium nitrate concentration in the resulting solution?

For the perchlorate ion ClO₄^- , what are the oxidation states of the Cl and O, respectively?