Question 1

How many H+ ions can the acid H2SO4 donate per molecule?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 2

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is FALSE? 
3Fe(s)+ 4H2O(l)→ Fe3O4(s)+ 4H2(g)

Accepted Answer

A) 6.91 g of Fe3O4 are produced. 
B) 2.85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant. 
A) 6.91 g of Fe3O4 are produced. 
B) 2.85 g of H2O are left over. 
C) Mass is conserved in this reaction. 
D) Water is the limiting reactant.

Question 3

Identify the balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

Accepted Answer

A) Al(C2H3O2)2(aq)+ (NH4)2PO4(aq)→ AlPO4(s)+ 2NH4C2H3O2(aq) 
B) Al(C2H3O2)2(aq)+ (NH3)2PO4(aq)→ AlPO4(s)+ 2NH3C2H3O2(aq) 
C) Al(CO3)2(aq)+ (NH3)2PO4(aq)→ AlPO4(s)+ 2NH3CO3(aq) 
D) Al(C2H3O2)3(aq)+ (NH4)3PO4(aq)→ AlPO4(s)+ 3NH4C2H3O2(aq) 
E) Al(CO2)3(aq)+ (NH4)3PO3(aq)→ AlPO3(s)+ 3NH4CO2(aq) 
A) Al(C2H3O2)2(aq)+ (NH4)2PO4(aq)→ AlPO4(s)+ 2NH4C2H3O2(aq) 
B) Al(C2H3O2)2(aq)+ (NH3)2PO4(aq)→ AlPO4(s)+ 2NH3C2H3O2(aq) 
C) Al(CO3)2(aq)+ (NH3)2PO4(aq)→ AlPO4(s)+ 2NH3CO3(aq) 
D) Al(C2H3O2)3(aq)+ (NH4)3PO4(aq)→ AlPO4(s)+ 3NH4C2H3O2(aq) 
E) Al(CO2)3(aq)+ (NH4)3PO3(aq)→ AlPO3(s)+ 3NH4CO2(aq)

Question 4

How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s)+ 2H2O(l)→ 4KOH(s)+ O2(g)

Accepted Answer

A) 19.9 g O2 
B) 27.9 g O2 
C) 49.7 g O2 
D) 3.59 g O2 
E) 11.7 g O2 
A) 19.9 g O2 
B) 27.9 g O2 
C) 49.7 g O2 
D) 3.59 g O2 
E) 11.7 g O2

Question 5

What is the concentration of nitrate 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 6

A FeCl3 solution is 0.175 mol L-1.How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 450.mL of a solution that is 0.300 mol L-1 in Cl- ion?

Accepted Answer

A) 0.771 mL 
B) 257 mL 
C) 771 mL 
D) It is not possible to make a more concentrated solution from a less concentrated solution. 
A) 0.771 mL 
B) 257 mL 
C) 771 mL 
D) It is not possible to make a more concentrated solution from a less concentrated solution.

Question 7

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 moles of $\mathrm { N } _ { 2 }$ are produced by the decomposition of 2.54 mol of sodium azide?

Accepted Answer

A) 1.69 
B) 7.62 
C) 3.81 
D) 0.847 
E) 1.27 
A) 1.69 
B) 7.62 
C) 3.81 
D) 0.847 
E) 1.27

Question 8

How many moles of CuO can be produced from 0.900 mol of Cu2O in the following reaction? 
2Cu2O(s)+ O2(g)→ 4CuO(s)

Accepted Answer

A) 0.450 mol 
B) 0.900 mol 
C) 1.80 mol 
D) 3.60 mol 
A) 0.450 mol 
B) 0.900 mol 
C) 1.80 mol 
D) 3.60 mol

Question 9

Determine the oxidation state of C in CO32-.

Accepted Answer

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

Question 10

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced?
FeS2 + O2 → Fe2O3 + SO2

Accepted Answer

Question 11

Identify the oxidation state of Mg in Mg(s). 
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 12

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 
2Mg(s)+ $\mathrm { O } _ { 2 }$ (g)? 2MgO(s)
How many moles of $\mathrm { O } _ { 2 }$ are consumed when 0.850 mol of magnesium burns?

Accepted Answer

A) 1.70 
B) 0.850 
C) 0.0350 
D) 0.559 
E) 0.425 
A) 1.70 
B) 0.850 
C) 0.0350 
D) 0.559 
E) 0.425

Question 13

What is the concentration of an AlCl3 solution if 150.mL of the solution contains 450.mg of Cl- ion?

Accepted Answer

A) 2.82 × 10-2 mol L-1 
B) 6.75 × 10-2 mol L-1 
C) 8.46 × 10-2 mol L-1 
D) 2.54 × 10-1 mol L-1 
A) 2.82 × 10-2 mol L-1 
B) 6.75 × 10-2 mol L-1 
C) 8.46 × 10-2 mol L-1 
D) 2.54 × 10-1 mol L-1

Question 14

How many moles of NaCl are required to make 250 mL of a 3.00 mol L-1 solution?

Accepted Answer

A) 750 moles 
B) 0.750 moles 
C) 3 moles 
D) 0.250 moles 
A) 750 moles 
B) 0.750 moles 
C) 3 moles 
D) 0.250 moles

Question 15

According to the following reaction,how many moles of Fe(OH)2 can form from 175.0 mL of 0.227 mol L-1 LiOH solution? Assume that there is excess FeCl2. FeCl2(aq)+ 2LiOH(aq)→ Fe(OH)2(s)+ 2LiCl(aq)

Accepted Answer

A) 3.97 × 10-2 moles 
B) 2.52 × 10-2 moles 
C) 1.99 × 10-2 moles 
D) 5.03 × 10-2 moles 
E) 6.49 × 10-2 moles 
A) 3.97 × 10-2 moles 
B) 2.52 × 10-2 moles 
C) 1.99 × 10-2 moles 
D) 5.03 × 10-2 moles 
E) 6.49 × 10-2 moles

Question 16

When 31.2 mL of 0.500 mol L-1 AgNO3 is added to 25.0 mL of 0.300 mol L-1 NH4Cl,how many grams of AgCl are formed? 
AgNO3(aq)+ NH4Cl(aq)→ AgCl(s)+ NH4NO3(aq)

Accepted Answer

A) 1.07 g 
B) 2.24 g 
C) 3.31 g 
D) 6.44 g 
A) 1.07 g 
B) 2.24 g 
C) 3.31 g 
D) 6.44 g

Question 17

Identify the polyprotic acid.

Accepted Answer

A) H2SO4 
B) HCl 
C) NaCl 
D) NaOH 
E) Li(OH)2 
A) H2SO4 
B) HCl 
C) NaCl 
D) NaOH 
E) Li(OH)2

Question 18

What element is undergoing oxidation (if any)in the following reaction? CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(g)

Accepted Answer

A) O 
B) H 
C) C 
D) both C and H 
E) This is not an oxidation-reduction reaction. 
A) O 
B) H 
C) C 
D) both C and H 
E) This is not an oxidation-reduction reaction.

Question 19

Identify the balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapour.

Accepted Answer

A) 2C2H6(g)+ 7O2(g)→ 4CO2(g)+ 6H2O(g) 
B) C2H6(g)+ 5O(g)→ 2CO(g)+ 3H2O(g) 
C) 2C2H6(g)+ 5O2(g)→ 4CO(g)+ 6H2O(g) 
D) C2H6(g)+ 7O(g)→ 2CO2(g)+ 3H2O(g) 
E) 2CH3(g)+ 5O(g)→ 2CO(g)+ 3H2O(g) 
A) 2C2H6(g)+ 7O2(g)→ 4CO2(g)+ 6H2O(g) 
B) C2H6(g)+ 5O(g)→ 2CO(g)+ 3H2O(g) 
C) 2C2H6(g)+ 5O2(g)→ 4CO(g)+ 6H2O(g) 
D) C2H6(g)+ 7O(g)→ 2CO2(g)+ 3H2O(g) 
E) 2CH3(g)+ 5O(g)→ 2CO(g)+ 3H2O(g)

Question 20

How many millilitres of a 9.0 mol L-1 H2SO4 solution are needed to make 0.35 L of a 3.5 mol L-1 solution?

Accepted Answer

A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL 
A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL

Exam 4: Chemical Reactions and Stoichiometry

How many H+ ions can the acid H2SO4 donate per molecule?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is FALSE? 3Fe(s)+ 4H2O(l)→ Fe3O4(s)+ 4H2(g)

Identify the balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s)+ 2H2O(l)→ 4KOH(s)+ O2(g)

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

A FeCl3 solution is 0.175 mol L-1.How many mL of a 0.175 mol L-1 FeCl3 solution are needed to make 450.mL of a solution that is 0.300 mol L-1 in Cl- ion?

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 moles of N2\mathrm { N } _ { 2 }N2​ are produced by the decomposition of 2.54 mol of sodium azide?

How many moles of CuO can be produced from 0.900 mol of Cu2O in the following reaction? 2Cu2O(s)+ O2(g)→ 4CuO(s)

Determine the oxidation state of C in CO32-.

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

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

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+ O2\mathrm { O } _ { 2 }O2​ (g)? 2MgO(s) How many moles of O2\mathrm { O } _ { 2 }O2​ are consumed when 0.850 mol of magnesium burns?

What is the concentration of an AlCl3 solution if 150.mL of the solution contains 450.mg of Cl- ion?

How many moles of NaCl are required to make 250 mL of a 3.00 mol L-1 solution?

According to the following reaction,how many moles of Fe(OH)2 can form from 175.0 mL of 0.227 mol L-1 LiOH solution? Assume that there is excess FeCl2. FeCl2(aq)+ 2LiOH(aq)→ Fe(OH)2(s)+ 2LiCl(aq)

When 31.2 mL of 0.500 mol L-1 AgNO3 is added to 25.0 mL of 0.300 mol L-1 NH4Cl,how many grams of AgCl are formed? AgNO3(aq)+ NH4Cl(aq)→ AgCl(s)+ NH4NO3(aq)

Identify the polyprotic acid.

What element is undergoing oxidation (if any)in the following reaction? CH4(g)+ 2O2(g)→ CO2(g)+ 2H2O(g)

Identify the balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapour.

How many millilitres of a 9.0 mol L-1 H2SO4 solution are needed to make 0.35 L of a 3.5 mol L-1 solution?

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Filters

How many H⁺ ions can the acid H₂SO₄ donate per molecule?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is FALSE? 3Fe(s)+ 4H₂O(l)→ Fe₃O₄(s)+ 4H₂(g)

How many grams of oxygen are formed when 6.21 moles of KOH are formed? 4KO(s)+ 2H₂O(l)→ 4KOH(s)+ O₂(g)

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

A FeCl₃ solution is 0.175 mol L^-1.How many mL of a 0.175 mol L^-1 FeCl₃solution are needed to make 450.mL of a solution that is 0.300 mol L^-1 in Cl^- ion?

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 moles of $\mathrm { N } _ { 2 }$ are produced by the decomposition of 2.54 mol of sodium azide?

How many moles of CuO can be produced from 0.900 mol of Cu₂O in the following reaction? 2Cu₂O(s)+ O₂(g)→ 4CuO(s)

Determine the oxidation state of C in CO₃^2-.

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

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

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+ $\mathrm { O } _ { 2 }$ (g)? 2MgO(s) How many moles of $\mathrm { O } _ { 2 }$ are consumed when 0.850 mol of magnesium burns?

What is the concentration of an AlCl₃ solution if 150.mL of the solution contains 450.mg of Cl^- ion?

How many moles of NaCl are required to make 250 mL of a 3.00 mol L^-1 solution?

According to the following reaction,how many moles of Fe(OH)₂ can form from 175.0 mL of 0.227 mol L^-1 LiOH solution? Assume that there is excess FeCl₂. FeCl₂(aq)+ 2LiOH(aq)→ Fe(OH)₂(s)+ 2LiCl(aq)

When 31.2 mL of 0.500 mol L^-1 AgNO₃ is added to 25.0 mL of 0.300 mol L^-1 NH₄Cl,how many grams of AgCl are formed? AgNO₃(aq)+ NH₄Cl(aq)→ AgCl(s)+ NH₄NO₃(aq)

What element is undergoing oxidation (if any)in the following reaction? CH₄(g)+ 2O₂(g)→ CO₂(g)+ 2H₂O(g)

How many millilitres of a 9.0 mol L^-1 H₂SO₄ solution are needed to make 0.35 L of a 3.5 mol L^-1 solution?