Question 1

What is the concentration of FeBr3 in a solution prepared by dissolving 10.0 g of FeBr3 in enough water to make 275 mL of solution?

Accepted Answer

A) 1.23 × 10-4 M 
B) 0.123 M 
C) 1.23 M 
D) 1.23 × 103 M

Question 2

The oxidation number of chromium in Ag₂Cr₂O₇ is ________.

Accepted Answer

The answer of The oxidation number of chromium in Ag₂Cr₂O₇...

Question 3

-The concentration of an aqueous solution of Fe2+ can be determined by a redox titration with aqueous bromate ion,BrO3⁻: 6 Fe2+ (aq)+ BrO3⁻ (aq)+ 6 H⁺ (aq)→ 6 Fe3+ (aq)+ Br⁻ (aq)+ 3 H2O (l)
Assume that the black spheres in the buret represent BrO3⁻ ions,the gray spheres in the flask represent Fe2+ ions,the concentration of the BrO3⁻ ions in the buret is 0.120 M,and the volumes in the buret and the flask are identical.What is the concentration of the Fe2+ in the flask,and what fraction of the BrO3⁻ solution in the buret must be added to the flask to react with all the Fe2+ ions?

Accepted Answer

A) 0.0200 M Fe2+;1/18 of the BrO3⁻ must be added. 
B) 0.0200 M Fe2+;1/3 of the BrO3⁻ must be added. 
C) 0.0400 M Fe2+;1/18 of the BrO3⁻ must be added. 
D) 0.0400 M Fe2+;1/3 of the BrO3⁻ must be added.

Question 4

The chemical formula for nitric acid is

Accepted Answer

A) HNO2(aq). 
B) HNO3(aq). 
C) H2NO3(aq). 
D) H2NO2(aq).

Question 5

The number of grams of NaCl required to prepare 500 mL of 0.100 M NaCl is ________.

Accepted Answer

The answer of The number of grams of NaCl required...

Question 6

What is the oxidation number change for the chromium atom in the following unbalanced reduction half reaction? Cr2O72-(aq)+ H+(aq)→ Cr3+(aq)+ H2O(l)

Accepted Answer

A) -7 
B) -3 
C) +3 
D) +6

Question 7

Which of the following compounds is not an Arrhenius acid?

Accepted Answer

A) CH3CO2H 
B) C3H7NH2 
C) HNO2 
D) H2SO4

Question 8

What is the concentration of NO3- ions in a solution prepared by dissolving 20.0 g of Ca(NO3)2 in enough water to produce 300.mL of solution?

Accepted Answer

A) 0.203 M 
B) 0.406 M 
C) 0.537 M 
D) 0.813 M

Question 9

Which pair of reactants will produce a precipitate when mixed together?

Accepted Answer

A) HI(aq)and KOH(aq) 
B) HCl(aq)and Li2CO3(aq) 
C) HCl(aq)and K2S(aq) 
D) HBr(aq)and Pb(NO3)2(aq)

Question 10

Balance the chemical equation given below,and determine the number of milliliters of 0.00300 M phosphoric acid required to neutralize 25.00 mL of 0.00150 M calcium hydroxide. ________ Ca(OH)2(aq)+ ________ H3PO4(aq)→ ________ Ca3(PO4)2(aq)+ ________ H2O(l)

Accepted Answer

A) 1.69 mL 
B) 8.33 mL 
C) 12.5 mL 
D) 18.8 mL

Question 11

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

Accepted Answer

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

Question 12

When dissolved in water,NaOH behaves as

Accepted Answer

A) an acid that forms Na+ and OH- ions. 
B) an acid that forms NaO- and H+ ions. 
C) a base that forms Na+ and OH- ions. 
D) a base that forms NaO- and H+ ions.

Question 13

Which of the following compounds is an Arrhenius base?

Accepted Answer

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

Question 14

Which of the compounds of H NO2, Ra(OH)2,FrOH,and HI,behave as acids when they are dissolved in water?

Accepted Answer

A) Ra(OH)2 and FrOH 
B) H NO2 and HI 
C) only HI 
D) only FrOH

Question 15

Assume that an aqueous solution of a cation,represented by shaded spheres,is allowed to mix with a solution of an anion,represented by unshaded spheres.Three possible outcomes are represented by boxes (a)-(c). 
-Which outcome corresponds to the mixing of potassium and sulfide ions shown in the following equation? 2 K+(aq)+ S2-(aq)→ ?

Accepted Answer

A) box (a) 
B) box (b) 
C) box (c) 
D) None of these

Question 16

Using the following sequence of reactions,determine the order of oxidizing agents (strongest to weakest). Q + U+ → Q+ + U
U + W+ → U+ + W
Q + W+ → Q+ + W

Accepted Answer

A) Q > U > W 
B) W > U > Q 
C) Q+ > U+ > W+ 
D) W+ > U+ > Q+

Question 17

Predict the products of a reaction between AgNO3(aq)and CsBr(aq).

Accepted Answer

A) Ag(s)and NO(g) 
B) Ag(s)and Br2(l) 
C) AgBr(s)and CsNO3(aq) 
D) AgNO3(aq)and CsBr(aq)

Question 18

What reagent could be used to separate Br- from SO42- when added to an aqueous solution containing both?

Accepted Answer

A) AgNO3(aq) 
B) Ba(OH)2(aq) 
C) CuSO4(aq) 
D) NaI(aq)

Question 19

How many milliliters of 0.100 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) 25.4 mL 
B) 43.0 mL 
C) 50.1 mL 
D) 102 mL

Question 20

How many grams of KNO3 are needed to make 250.mL of a solution that is 0.135 M?

Accepted Answer

A) 1.71 g 
B) 0.341 g 
C) 3.41 g 
D) 6.82 g

Exam 4: Reactions in Aqueous Solutions

What is the concentration of FeBr₃ in a solution prepared by dissolving 10.0 g of FeBr₃ in enough water to make 275 mL of solution?

The oxidation number of chromium in Ag₂Cr₂O₇ is ________.

The chemical formula for nitric acid is

The number of grams of NaCl required to prepare 500 mL of 0.100 M NaCl is ________.

What is the oxidation number change for the chromium atom in the following unbalanced reduction half reaction? Cr₂O₇^2-(aq) + H⁺(aq) → Cr³⁺(aq) + H₂O(l)

Which of the following compounds is not an Arrhenius acid?

What is the concentration of NO₃^- ions in a solution prepared by dissolving 20.0 g of Ca(NO₃) ₂ in enough water to produce 300.mL of solution?

Which pair of reactants will produce a precipitate when mixed together?

Balance the chemical equation given below,and determine the number of milliliters of 0.00300 M phosphoric acid required to neutralize 25.00 mL of 0.00150 M calcium hydroxide. Ca(OH) ₂(aq) + H₃PO₄(aq) → Ca₃(PO₄) ₂(aq) + H₂O(l)

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

When dissolved in water,NaOH behaves as

Which of the following compounds is an Arrhenius base?

Which of the compounds of HNO_2, Ra(OH) ₂,FrOH,and HI,behave as acids when they are dissolved in water?

Using the following sequence of reactions,determine the order of oxidizing agents (strongest to weakest) . Q + U⁺ → Q⁺ + U U + W⁺ → U⁺ + W Q + W⁺ → Q⁺ + W

Predict the products of a reaction between AgNO₃(aq) and CsBr(aq) .

What reagent could be used to separate Br^- from SO₄^2- when added to an aqueous solution containing both?

How many milliliters of 0.100 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)

How many grams of KNO₃ are needed to make 250.mL of a solution that is 0.135 M?

Exam 4: Reactions in Aqueous Solutions

What is the concentration of FeBr3 in a solution prepared by dissolving 10.0 g of FeBr3 in enough water to make 275 mL of solution?

The oxidation number of chromium in Ag2Cr2O7 is ________.

The chemical formula for nitric acid is

The number of grams of NaCl required to prepare 500 mL of 0.100 M NaCl is ________.

What is the oxidation number change for the chromium atom in the following unbalanced reduction half reaction? Cr2O72-(aq) + H+(aq) → Cr3+(aq) + H2O(l)

Which of the following compounds is not an Arrhenius acid?

What is the concentration of NO3- ions in a solution prepared by dissolving 20.0 g of Ca(NO3) 2 in enough water to produce 300.mL of solution?

Which pair of reactants will produce a precipitate when mixed together?

Balance the chemical equation given below,and determine the number of milliliters of 0.00300 M phosphoric acid required to neutralize 25.00 mL of 0.00150 M calcium hydroxide. ________ Ca(OH) 2(aq) + ________ H3PO4(aq) → ________ Ca3(PO4) 2(aq) + ________ H2O(l)

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

When dissolved in water,NaOH behaves as

Which of the following compounds is an Arrhenius base?

Which of the compounds of H NO2, Ra(OH) 2,FrOH,and HI,behave as acids when they are dissolved in water?

Using the following sequence of reactions,determine the order of oxidizing agents (strongest to weakest) . Q + U+ → Q+ + U U + W+ → U+ + W Q + W+ → Q+ + W

Predict the products of a reaction between AgNO3(aq) and CsBr(aq) .

What reagent could be used to separate Br- from SO42- when added to an aqueous solution containing both?

How many milliliters of 0.100 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)

How many grams of KNO3 are needed to make 250.mL of a solution that is 0.135 M?

What is the concentration of FeBr₃ in a solution prepared by dissolving 10.0 g of FeBr₃ in enough water to make 275 mL of solution?

The oxidation number of chromium in Ag₂Cr₂O₇ is ________.

What is the oxidation number change for the chromium atom in the following unbalanced reduction half reaction? Cr₂O₇^2-(aq) + H⁺(aq) → Cr³⁺(aq) + H₂O(l)

What is the concentration of NO₃^- ions in a solution prepared by dissolving 20.0 g of Ca(NO₃) ₂ in enough water to produce 300.mL of solution?

Balance the chemical equation given below,and determine the number of milliliters of 0.00300 M phosphoric acid required to neutralize 25.00 mL of 0.00150 M calcium hydroxide. Ca(OH) ₂(aq) + H₃PO₄(aq) → Ca₃(PO₄) ₂(aq) + H₂O(l)

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

Which of the compounds of HNO_2, Ra(OH) ₂,FrOH,and HI,behave as acids when they are dissolved in water?

Using the following sequence of reactions,determine the order of oxidizing agents (strongest to weakest) . Q + U⁺ → Q⁺ + U U + W⁺ → U⁺ + W Q + W⁺ → Q⁺ + W

Predict the products of a reaction between AgNO₃(aq) and CsBr(aq) .

What reagent could be used to separate Br^- from SO₄^2- when added to an aqueous solution containing both?

How many milliliters of 0.100 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)

How many grams of KNO₃ are needed to make 250.mL of a solution that is 0.135 M?