Question 1

What reagent could not be used to separate Br- from CO32- when added to an aqueous solution containing both?

Accepted Answer

A) AgNO3(aq) 
B) Ca(NO3)2(aq) 
C) Cu(NO3)2(aq) 
D) Fe(NO3)2(aq) 
A) AgNO3(aq) 
B) Ca(NO3)2(aq) 
C) Cu(NO3)2(aq) 
D) Fe(NO3)2(aq)

Question 2

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? 
________ NO3-(aq)+ ________ Cu(s)→ ________ NO(g)+ ________ Cu2+(aq)?

Accepted Answer

A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6 
A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6

Question 3

How many litres of a 0.0550 mol L-1 KCl solution contain 0.163 moles of KCl?

Accepted Answer

A) 3.37 L 
B) 1.48 L 
C) 8.97 L 
D) 2.96 L 
E) 1.12 L 
A) 3.37 L 
B) 1.48 L 
C) 8.97 L 
D) 2.96 L 
E) 1.12 L

Question 4

Identify the oxidation state of H in HCl(aq). 
Mg(s)+ 2HCl(aq)→ MgCl2(aq)+ H2(g)

Accepted Answer

A) +1 
B) +2 
C) 0 
D) -1 
E) -2 
A) +1 
B) +2 
C) 0 
D) -1 
E) -2

Question 5

How many millilitres of a stock solution of 13.1 mol L-1 $\mathrm { HNO } _ { 3 }$ would be needed to prepare 0.500 L of 0.500 mol L-1 $\mathrm { HNO } _ { 3 }$ ?

Accepted Answer

A) 0.0191 mL 
B) 52.4 mL 
C) 0.0524 mL 
D) 3.28 mL 
E) 19.1 mL 
A) 0.0191 mL 
B) 52.4 mL 
C) 0.0524 mL 
D) 3.28 mL 
E) 19.1 mL

Question 6

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2AgNO3(aq)→ Zn(NO3)2(aq)+ 2Ag(s)

Accepted Answer

A) Zn 
B) N 
C) O 
D) Ag 
E) This is not an oxidation-reduction reaction. 
A) Zn 
B) N 
C) O 
D) Ag 
E) This is not an oxidation-reduction reaction.

Question 7

Balance the chemical equation given below,and determine the number of millilitres of 0.00300 mol L-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L-1 calcium hydroxide. 
________ Ca(OH)2(aq)+ ________ H3PO4(aq)→ ________ Ca3(PO4)2(aq)+ ________ H2O(l)

Accepted Answer

A) 3.04 mL 
B) 15.0 mL 
C) 22.5 mL 
D) 33.8 mL 
A) 3.04 mL 
B) 15.0 mL 
C) 22.5 mL 
D) 33.8 mL

Question 8

Two samples of calcium fluoride are decomposed into their constituent elements.The first sample produced 0.154 g of calcium and 0.146 g of fluorine.If the second sample produced 294 mg of fluorine,how many grams of calcium were formed?

Accepted Answer

A) 0.280 g 
B) 3.09 × 102 g 
C) 3.13 g 
D) 0.310 g 
E) 2.80 × 102 g 
A) 0.280 g 
B) 3.09 × 102 g 
C) 3.13 g 
D) 0.310 g 
E) 2.80 × 102 g

Question 9

When 7.00 × 1022 molecules of ammonia react with 6.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 
4NH3(g)+ 3O2(g)→ 2N2(g)+ 6H2O(g)

Accepted Answer

A) 1.63 g 
B) 1.86 g 
C) 4.19 g 
D) 6.51 g 
A) 1.63 g 
B) 1.86 g 
C) 4.19 g 
D) 6.51 g

Question 10

How many millilitres of 0.260 mol L-1 Na2S are needed to react with 40.00 mL of 0.315 mol L-1 AgNO3? 
Na2S(aq)+ 2AgNO3(aq)→ 2NaNO3(aq)+ Ag2S(s)

Accepted Answer

A) 24.2 mL 
B) 48.5 mL 
C) 66.0 mL 
D) 96.9 mL 
A) 24.2 mL 
B) 48.5 mL 
C) 66.0 mL 
D) 96.9 mL

Question 11

Determine the molarity of a solution formed by dissolving 97.7 g LiBr in enough water to yield 750.0 mL of solution.

Accepted Answer

A) 1.50 mol L-1 
B) 1.18 mol L-1 
C) 0.130 mol L-1 
D) 0.768 mol L-1 
E) 2.30 mol L-1 
A) 1.50 mol L-1 
B) 1.18 mol L-1 
C) 0.130 mol L-1 
D) 0.768 mol L-1 
E) 2.30 mol L-1

Question 12

Based on the balanced chemical equation shown below,determine the molarity of a solution containing Fe2+(aq)if 40.00 mL of the Fe2+(aq)solution is required to completely react with 30.00 mL of a 0.250 mol L-1 potassium bromate,KBrO3(aq),solution.The chemical equation for the reaction is 
6Fe2+(aq)+ BrO3-(aq)+ 6H+(aq)→ 6Fe3+(aq)+ Br-(aq)+ 3H2O(l)

Accepted Answer

A) 0.0312 mol L-1 
B) 0.188 mol L-1 
C) 1.12 mol L-1 
D) 2.00 mol L-1 
A) 0.0312 mol L-1 
B) 0.188 mol L-1 
C) 1.12 mol L-1 
D) 2.00 mol L-1

Question 13

What is the concentration (M)of a NaCl solution prepared by dissolving 7.2 g of NaCl in sufficient water to give 425 mL of solution?

Accepted Answer

The answer of What is the concentration (M)of a NaCl...

Question 14

How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2. 
2H2S(g)+ SO2(g)→ 3S(s)+ 2H2O(l)

Accepted Answer

A) 1.48 × 1024 molecules H2S 
B) 9.89 × 1023 molecules H2S 
C) 5.06 × 1025 molecules H2S 
D) 3.17 × 1025 molecules H2S 
E) 2.44 × 1023 molecules H2S 
A) 1.48 × 1024 molecules H2S 
B) 9.89 × 1023 molecules H2S 
C) 5.06 × 1025 molecules H2S 
D) 3.17 × 1025 molecules H2S 
E) 2.44 × 1023 molecules H2S

Question 15

How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6Li(s)+ N2(g)→ 2Li3N(s)

Accepted Answer

A) 18.3 g Li3N 
B) 20.3 g Li3N 
C) 58.3 g Li3N 
D) 61.0 g Li3N 
E) 15.1 g Li3N 
A) 18.3 g Li3N 
B) 20.3 g Li3N 
C) 58.3 g Li3N 
D) 61.0 g Li3N 
E) 15.1 g Li3N

Question 16

What causes a precipitation reaction to occur between two soluble compounds?

Accepted Answer

A precipitate,or insoluble com

Question 17

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ H2O(l)? $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ (s)
A 4.50 g sample of CaO is reacted with 4.34 g of H2O.How many grams of water remain after the reaction is complete?

Accepted Answer

A) 0.161 g 
B) 0.00893 g 
C) 1.45 g 
D) 0.241 g 
E) 2.89 g 
A) 0.161 g 
B) 0.00893 g 
C) 1.45 g 
D) 0.241 g 
E) 2.89 g

Question 18

What element is being reduced in the following (unbalanced)redox reaction? MnO4- (aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

Accepted Answer

A) C 
B) O 
C) Mn 
D) H 
A) C 
B) O 
C) Mn 
D) H

Question 19

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

A) 0.045 mol L-1 Al2(SO4)3 
B) 0.050 mol L-1 (NH4)2CO3 
C) 0.10 mol L-1 LiBr 
D) 0.10 mol L-1 NaI 
E) 0.10 mol L-1 KF 
A) 0.045 mol L-1 Al2(SO4)3 
B) 0.050 mol L-1 (NH4)2CO3 
C) 0.10 mol L-1 LiBr 
D) 0.10 mol L-1 NaI 
E) 0.10 mol L-1 KF

Question 20

A solution is prepared by mixing 70.0 mL of 0.100 mol L-1 HCl and 30.0 mL of 0.200 mol L-1 NaCl.What is the molarity of chloride ion in this solution?

Accepted Answer

A) 0.186 mol L-1 
B) 7.69 mol L-1 
C) 6.50 mol L-1 
D) 0.0100 mol L-1 
E) 0.130 mol L-1 
A) 0.186 mol L-1 
B) 7.69 mol L-1 
C) 6.50 mol L-1 
D) 0.0100 mol L-1 
E) 0.130 mol L-1

Exam 4: Chemical Reactions and Stoichiometry

What reagent could not be used to separate Br- from CO32- when added to an aqueous solution containing both?

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? ________ NO3-(aq)+ ________ Cu(s)→ ________ NO(g)+ ________ Cu2+(aq)?

How many litres of a 0.0550 mol L-1 KCl solution contain 0.163 moles of KCl?

Identify the oxidation state of H in HCl(aq). Mg(s)+ 2HCl(aq)→ MgCl2(aq)+ H2(g)

How many millilitres of a stock solution of 13.1 mol L-1 HNO3\mathrm { HNO } _ { 3 }HNO3​ would be needed to prepare 0.500 L of 0.500 mol L-1 HNO3\mathrm { HNO } _ { 3 }HNO3​ ?

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2AgNO3(aq)→ Zn(NO3)2(aq)+ 2Ag(s)

Balance the chemical equation given below,and determine the number of millilitres of 0.00300 mol L-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L-1 calcium hydroxide. ________ Ca(OH)2(aq)+ ________ H3PO4(aq)→ ________ Ca3(PO4)2(aq)+ ________ H2O(l)

Two samples of calcium fluoride are decomposed into their constituent elements.The first sample produced 0.154 g of calcium and 0.146 g of fluorine.If the second sample produced 294 mg of fluorine,how many grams of calcium were formed?

When 7.00 × 1022 molecules of ammonia react with 6.00 × 1022 molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4NH3(g)+ 3O2(g)→ 2N2(g)+ 6H2O(g)

How many millilitres of 0.260 mol L-1 Na2S are needed to react with 40.00 mL of 0.315 mol L-1 AgNO3? Na2S(aq)+ 2AgNO3(aq)→ 2NaNO3(aq)+ Ag2S(s)

Determine the molarity of a solution formed by dissolving 97.7 g LiBr in enough water to yield 750.0 mL of solution.

What is the concentration (M)of a NaCl solution prepared by dissolving 7.2 g of NaCl in sufficient water to give 425 mL of solution?

How many molecules of H2S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2. 2H2S(g)+ SO2(g)→ 3S(s)+ 2H2O(l)

How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6Li(s)+ N2(g)→ 2Li3N(s)

What causes a precipitation reaction to occur between two soluble compounds?

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ H2O(l)? Ca(OH)2\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }Ca(OH)2​ (s) A 4.50 g sample of CaO is reacted with 4.34 g of H2O.How many grams of water remain after the reaction is complete?

What element is being reduced in the following (unbalanced)redox reaction? MnO4- (aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

Which of the following solutions will have the highest electrical conductivity?

A solution is prepared by mixing 70.0 mL of 0.100 mol L-1 HCl and 30.0 mL of 0.200 mol L-1 NaCl.What is the molarity of chloride ion in this solution?

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Filters

What reagent could not be used to separate Br^- from CO₃^2- when added to an aqueous solution containing both?

What are the coefficients in front of NO₃^-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution? NO₃^-(aq)+ Cu(s)→ NO(g)+ Cu²⁺(aq)?

How many litres of a 0.0550 mol L^-1 KCl solution contain 0.163 moles of KCl?

Identify the oxidation state of H in HCl(aq). Mg(s)+ 2HCl(aq)→ MgCl₂(aq)+ H₂(g)

How many millilitres of a stock solution of 13.1 mol L^-1 $\mathrm { HNO } _ { 3 }$ would be needed to prepare 0.500 L of 0.500 mol L^-1 $\mathrm { HNO } _ { 3 }$ ?

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2AgNO₃(aq)→ Zn(NO₃)₂(aq)+ 2Ag(s)

Balance the chemical equation given below,and determine the number of millilitres of 0.00300 mol L^-1 phosphoric acid required to neutralize 45.00 mL of 0.00150 mol L^-1 calcium hydroxide. Ca(OH)₂(aq)+ H₃PO₄(aq)→ Ca₃(PO₄)₂(aq)+ H₂O(l)

When 7.00 × 10²² molecules of ammonia react with 6.00 × 10²² molecules of oxygen according to the chemical equation shown below,how many grams of nitrogen gas are produced? 4NH₃(g)+ 3O₂(g)→ 2N₂(g)+ 6H₂O(g)

How many millilitres of 0.260 mol L^-1 Na₂S are needed to react with 40.00 mL of 0.315 mol L^-1 AgNO₃? Na₂S(aq)+ 2AgNO₃(aq)→ 2NaNO₃(aq)+ Ag₂S(s)

How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO₂. 2H₂S(g)+ SO₂(g)→ 3S(s)+ 2H₂O(l)

How many grams of Li₃N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6Li(s)+ N₂(g)→ 2Li₃N(s)

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s)+ H₂O(l)? $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ (s) A 4.50 g sample of CaO is reacted with 4.34 g of H₂O.How many grams of water remain after the reaction is complete?

What element is being reduced in the following (unbalanced)redox reaction? MnO₄^- (aq)+ H₂C₂O₄(aq)→ Mn²⁺(aq)+ CO₂(g)

A solution is prepared by mixing 70.0 mL of 0.100 mol L^-1 HCl and 30.0 mL of 0.200 mol L^-1 NaCl.What is the molarity of chloride ion in this solution?