Question 1

What is the concentration of magnesium ions in a 0.125 mol L-1 Mg(NO3)2 solution?

Accepted Answer

A) 0.125 mol L-1 
B) 0.0625 mol L-1 
C) 0.375 mol L-1 
D) 0.250 mol L-1 
E) 0.160 mol L-1 
A) 0.125 mol L-1 
B) 0.0625 mol L-1 
C) 0.375 mol L-1 
D) 0.250 mol L-1 
E) 0.160 mol L-1

Question 2

What volume (in mL)of a 0.0887 mol L-1 MgF2 solution is needed to make 275.0 mL of a 0.0224 mol L-1 MgF2 solution?

Accepted Answer

A) 72.3 mL 
B) 91.8 mL 
C) 10.9 mL 
D) 69.4 mL 
E) 14.4 mL 
A) 72.3 mL 
B) 91.8 mL 
C) 10.9 mL 
D) 69.4 mL 
E) 14.4 mL

Question 3

Determine the oxidation state of P in PO33-.

Accepted Answer

A) +3 
B) +6 
C) +2 
D) 0 
E) -3 
A) +3 
B) +6 
C) +2 
D) 0 
E) -3

Question 4

How many molecules of sucrose 
(C12H22O11,molar mass = 342.30 g mol-1)are contained in 14.3 mL of 0.140 mol L-1 sucrose solution?

Accepted Answer

A) 8.29 × 1022 molecules C12H22O11 
B) 1.21 × 1021 molecules C12H22O11 
C) 6.15 × 1022 molecules C12H22O11 
D) 1.63 × 1023 molecules C12H22O11 
E) 5.90 × 1024 molecules C12H22O11 
A) 8.29 × 1022 molecules C12H22O11 
B) 1.21 × 1021 molecules C12H22O11 
C) 6.15 × 1022 molecules C12H22O11 
D) 1.63 × 1023 molecules C12H22O11 
E) 5.90 × 1024 molecules C12H22O11

Question 5

What is the oxidation number of the chromium atom in K2CrO4 ?

Accepted Answer

A) -2 
B) +2 
C) +6 
D) +7 
A) -2 
B) +2 
C) +6 
D) +7

Question 6

Identify the balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

Accepted Answer

A) H2SO4(aq)+ LiOH(aq)→ H2O(l)+ Li2SO4(aq) 
B) H2SO3(aq)+ 2LiOH(aq)→ 2H2O(l)+ Li2SO3(aq) 
C) HSO3(aq)+ LiOH(aq)→ H2O(l)+ LiSO3(aq) 
D) HSO4(aq)+ LiOH(aq)→ H2O(l)+ LiSO4(aq) 
E) H2S(aq)+ 2LiOH(aq)→ 2H2O(l)+ Li2S(aq) 
A) H2SO4(aq)+ LiOH(aq)→ H2O(l)+ Li2SO4(aq) 
B) H2SO3(aq)+ 2LiOH(aq)→ 2H2O(l)+ Li2SO3(aq) 
C) HSO3(aq)+ LiOH(aq)→ H2O(l)+ LiSO3(aq) 
D) HSO4(aq)+ LiOH(aq)→ H2O(l)+ LiSO4(aq) 
E) H2S(aq)+ 2LiOH(aq)→ 2H2O(l)+ Li2S(aq)

Question 7

How many grams of H3PO4 are in 265 mL of a 1.50 mol L-1 solution of H3PO4 ?

Accepted Answer

Question 8

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L-1 LiI solution?

Accepted Answer

A) 1.31 × 10-3 mol 
B) 8.74 × 10-3 mol 
C) 1.14 × 10-3 mol 
D) 3.67 × 10-3 mol 
E) 7.65 × 10-3 mol 
A) 1.31 × 10-3 mol 
B) 8.74 × 10-3 mol 
C) 1.14 × 10-3 mol 
D) 3.67 × 10-3 mol 
E) 7.65 × 10-3 mol

Question 9

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Al(C2H3O2)3 and LiNO3 are mixed.

Accepted Answer

A) Al3+(aq)+ 3NO3-(aq)→ Al(NO3)3(s) 
B) Li+(aq)+ C2H3O2-(aq)→ LiC2H3O2(s) 
C) Al3+(aq)+ 3NO3-(aq)+ Li+(aq)+ C2H3O2-(aq)→ Al(NO3)3(aq)+ LiC2H3O2(s) 
D) 3Li+(aq)+ (C2H3O2)33-(aq)→ Li3(C2H3O2)3(s) 
E) No reaction occurs. 
A) Al3+(aq)+ 3NO3-(aq)→ Al(NO3)3(s) 
B) Li+(aq)+ C2H3O2-(aq)→ LiC2H3O2(s) 
C) Al3+(aq)+ 3NO3-(aq)+ Li+(aq)+ C2H3O2-(aq)→ Al(NO3)3(aq)+ LiC2H3O2(s) 
D) 3Li+(aq)+ (C2H3O2)33-(aq)→ Li3(C2H3O2)3(s) 
E) No reaction occurs.

Question 10

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: $2 \mathrm { NaN } _ { 3 }$ (s)? 2Na(s)+ $3 \mathrm {~N} _ { 2 }$ (g) How many grams of sodium azide are required to produce 37.0 g of nitrogen?

Accepted Answer

A) 0.881 
B) 129 
C) 1.98 
D) 85.9 
E) 57.2 
A) 0.881 
B) 129 
C) 1.98 
D) 85.9 
E) 57.2

Question 11

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-number coefficients?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) none of the above 
A) 1 
B) 2 
C) 3 
D) none of the above

Question 12

How many ions are present in 30.0 mL of a 0.600 mol L-1 Na2CO3 solution?

Accepted Answer

A) 3.25 × 1022 ions 
B) 2.17 × 1022 ions 
C) 1.08 × 1022 ions 
D) 5.42 × 1022 ions 
E) 3.61 × 1021 ions 
A) 3.25 × 1022 ions 
B) 2.17 × 1022 ions 
C) 1.08 × 1022 ions 
D) 5.42 × 1022 ions 
E) 3.61 × 1021 ions

Question 13

How many grams of AgNO3 are needed to make 250.mL of a solution that is 0.135 mol L-1?

Accepted Answer

A) 0.0917 g 
B) 0.174 g 
C) 5.73 g 
D) 91.7 g 
A) 0.0917 g 
B) 0.174 g 
C) 5.73 g 
D) 91.7 g

Question 14

What is the difference between a voltaic cell and an electrolytic cell?

Accepted Answer

A voltaic cell contains a redo

Question 15

Sodium metal and water react to form hydrogen and sodium hydroxide.If 5.98 g of sodium react with water to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide,what mass of water was involved in the reaction?

Accepted Answer

A) 4.68 g 
B) 5.98 g 
C) 10.14 g 
D) 10.66 g 
A) 4.68 g 
B) 5.98 g 
C) 10.14 g 
D) 10.66 g

Question 16

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Zn and H+ in the balanced reaction? 
Zn2+(aq)+ NH4+(aq)→ Zn(s)+ NO3- (aq)

Accepted Answer

A) Zn = 1,H+ = 8 
B) Zn = 1,H+ = 4 
C) Zn = 4,H+ = 10 
D) Zn = 2,H+ = 4 
E) Zn = 3,H+ = 5 
A) Zn = 1,H+ = 8 
B) Zn = 1,H+ = 4 
C) Zn = 4,H+ = 10 
D) Zn = 2,H+ = 4 
E) Zn = 3,H+ = 5

Question 17

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L-1 solution of Al $\mathrm { Br } _ { 3 }$ .

Accepted Answer

Question 18

Balance the chemical equation given below,and determine the number of grams of MgO needed to produce 20.0 g of 
Fe2O3. MgO(s)+ Fe(s)→ Fe2O3(s)+ Mg(s)

Accepted Answer

A) 0.0660 g 
B) 1.68 g 
C) 5.05 g 
D) 15.1 g 
A) 0.0660 g 
B) 1.68 g 
C) 5.05 g 
D) 15.1 g

Question 19

When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction. Ca(s)+ 2H2O(l)→ Ca(OH)2(aq)+ H2(g)

Accepted Answer

A) 12.3% 
B) 24.6% 
C) 45.5% 
D) 84.0% 
A) 12.3% 
B) 24.6% 
C) 45.5% 
D) 84.0%

Question 20

When 280.mL of 1.50 × 10-4 mol L-1 hydrochloric acid is added to 135 mL of 1.75 × 10-4 mol L-1 Mg(OH)2,the resulting solution will be

Accepted Answer

A) acidic. 
B) basic 
C) neutral. 
D) It is impossible to tell from the information given. 
A) acidic. 
B) basic 
C) neutral. 
D) It is impossible to tell from the information given.

Exam 4: Chemical Reactions and Stoichiometry

What is the concentration of magnesium ions in a 0.125 mol L-1 Mg(NO3)2 solution?

What volume (in mL)of a 0.0887 mol L-1 MgF2 solution is needed to make 275.0 mL of a 0.0224 mol L-1 MgF2 solution?

Determine the oxidation state of P in PO33-.

How many molecules of sucrose (C12H22O11,molar mass = 342.30 g mol-1)are contained in 14.3 mL of 0.140 mol L-1 sucrose solution?

What is the oxidation number of the chromium atom in K2CrO4 ?

Identify the balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

How many grams of H3PO4 are in 265 mL of a 1.50 mol L-1 solution of H3PO4 ?

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L-1 LiI solution?

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Al(C2H3O2)3 and LiNO3 are mixed.

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN32 \mathrm { NaN } _ { 3 }2NaN3​ (s)? 2Na(s)+ 3 N23 \mathrm {~N} _ { 2 }3 N2​ (g) How many grams of sodium azide are required to produce 37.0 g of nitrogen?

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-number coefficients?

How many ions are present in 30.0 mL of a 0.600 mol L-1 Na2CO3 solution?

How many grams of AgNO3 are needed to make 250.mL of a solution that is 0.135 mol L-1?

What is the difference between a voltaic cell and an electrolytic cell?

Sodium metal and water react to form hydrogen and sodium hydroxide.If 5.98 g of sodium react with water to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide,what mass of water was involved in the reaction?

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Zn and H+ in the balanced reaction? Zn2+(aq)+ NH4+(aq)→ Zn(s)+ NO3- (aq)

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L-1 solution of Al Br3\mathrm { Br } _ { 3 }Br3​ .

Balance the chemical equation given below,and determine the number of grams of MgO needed to produce 20.0 g of Fe2O3. MgO(s)+ Fe(s)→ Fe2O3(s)+ Mg(s)

When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction. Ca(s)+ 2H2O(l)→ Ca(OH)2(aq)+ H2(g)

When 280.mL of 1.50 × 10-4 mol L-1 hydrochloric acid is added to 135 mL of 1.75 × 10-4 mol L-1 Mg(OH)2,the resulting solution will be

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What is the concentration of magnesium ions in a 0.125 mol L^-1 Mg(NO₃)₂ solution?

What volume (in mL)of a 0.0887 mol L^-1 MgF₂ solution is needed to make 275.0 mL of a 0.0224 mol L^-1 MgF₂solution?

Determine the oxidation state of P in PO₃^3-.

How many molecules of sucrose (C₁₂H₂₂O₁₁,molar mass = 342.30 g mol^-1)are contained in 14.3 mL of 0.140 mol L^-1 sucrose solution?

What is the oxidation number of the chromium atom in K₂CrO₄?

How many grams of H₃PO₄ are in 265 mL of a 1.50 mol L^-1 solution of H₃PO₄ ?

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L^-1 LiI solution?

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Al(C₂H₃O₂)₃ and LiNO₃ are mixed.

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: $2 \mathrm { NaN } _ { 3 }$ (s)? 2Na(s)+ $3 \mathrm {~N} _ { 2 }$ (g) How many grams of sodium azide are required to produce 37.0 g of nitrogen?

How many ions are present in 30.0 mL of a 0.600 mol L^-1 Na₂CO₃ solution?

How many grams of AgNO₃ are needed to make 250.mL of a solution that is 0.135 mol L^-1?

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Znand H⁺ in the balanced reaction? Zn²⁺(aq)+ NH₄⁺(aq)→ Zn(s)+ NO₃^- (aq)

There are ________ mol of bromide ions in 0.900 L of a 0.500 mol L^-1 solution of Al $\mathrm { Br } _ { 3 }$ .

Balance the chemical equation given below,and determine the number of grams of MgO needed to produce 20.0 g of Fe₂O₃. MgO(s)+ Fe(s)→ Fe₂O₃(s)+ Mg(s)

When 11.0 g of calcium metal is reacted with water,5.00 g of calcium hydroxide is produced.Using the following balanced equation,calculate the percent yield for the reaction. Ca(s)+ 2H₂O(l)→ Ca(OH)₂(aq)+ H₂(g)

When 280.mL of 1.50 × 10^-4mol L^-1 hydrochloric acid is added to 135 mL of 1.75 × 10^-4 mol L^-1 Mg(OH)₂,the resulting solution will be