Question 1

Explain the difference between a strong and weak electrolyte.Give an example of each.

Accepted Answer

The answer of Explain the difference between a strong and...

Question 2

Give the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

Accepted Answer

A) 2 H+(aq)+ CO32-(aq)→ H2CO3(s) 
B) 2 Na+(aq)+ CO32-(aq)+ 2 H+(aq)+ 2 Cl-(aq)→ H2CO3(s)+ 2 NaCl(aq) 
C) 2 H+(aq)+ CO32-(aq)→ H2O(l)+ CO2(g) 
D) 2 Na+(aq)+ CO32-(aq)+ 2 H+(aq)+ 2 Cl-(aq)→ H2CO3(s)+ 2 Na+(aq)+ 2 Cl-(aq) 
E) No reaction occurs.

Question 3

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?
3 Fe(s)+ 4 H2O(l)→ Fe3O4(s)+ 4 H2(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.

Question 4

In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H2SO4 solution?

Accepted Answer

A) 0.194 M 
B) 0.387 M 
C) 0.775 M 
D) 1.29 M

Question 5

What volume of a 0.540 M NaOH solution contains 11.5 g of NaOH?

Accepted Answer

A) 0.155 L 
B) 0.532 L 
C) 1.88 L 
D) 6.44 L

Question 6

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H2SO4 solution (in M)?

Accepted Answer

A) 0.20 M 
B) 0.40 M 
C) 0.10 M 
D) 0.36 M 
E) 0.25 M

Question 7

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)

Question 8

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 6.20 g of carbonic acid?
H2CO3 → H2O + CO2

Accepted Answer

A) 4.40 g 
B) 8.80 g 
C) 2.20 g 
D) 6.20 g

Question 9

Which of the following is not a strong electrolyte?

Accepted Answer

A) CaS 
B) LiSO4 
C) NH4OH 
D) CH3CH2CH3 
E) Na2CO3

Question 10

Which of the compounds H2C2O4,Ca(OH)2,KOH,and HI,behave as bases when they are dissolved in water?

Accepted Answer

A) Ca(OH)2 and KOH 
B) H2C2O4 and HI 
C) only HI 
D) only KOH

Question 11

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

Question 12

Determine the oxidation state of Cl in NaClO3.

Accepted Answer

A) +6 
B) +4 
C) +3 
D) +2 
E) +5

Question 13

How many moles of CH3CH2OH are contained in 548 mL of 0.0788 M CH3CH2OH solution?

Accepted Answer

A) 4.32 × 10-2 mol 
B) 2.32 × 10-2 mol 
C) 6.95 × 10-2 mol 
D) 1.44 × 10-2 mol 
E) 5.26 × 10-2 mol

Question 14

What mass of N2 will be produced from the reaction of 50.0 g N2O4 with 45.0 g N2H4?
N2O4(l)+ 2 N2H4(l)→ 3 N2(g)+ 4 H2O(g)

Accepted Answer

A) 59.0 g 
B) 118 g 
C) 152 g 
D) 45.7 g

Question 15

Match the following.
-Mg(s)+ Cu(NO3)2(aq)→ Mg(NO3)2(aq)+ Cu(s)

Accepted Answer

A) combustion 
B) acid base 
C) oxidation reduction 
D) gas evolution 
E) precipitation

Question 16

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction.
Fe2O3(s)+ 2 Al(s)→ Al2O3(s)+ 2 Fe(s)

Accepted Answer

A) 61.03% 
B) 28.65% 
C) 57.30% 
D) 20.02% 
E) 81.93%

Question 17

How many milliliters of a stock solution of 11.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?

Accepted Answer

A) 0.0444 mL 
B) 22.5 mL 
C) 2.78 mL 
D) 44.4 mL 
E) 0.0225 mL

Question 18

A stock solution of HNO3 is prepared and found to contain 13.5 M of HNO3.If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,the concentration of the diluted solution is ________ M.

Accepted Answer

A) 0.270 
B) 1.48 
C) 0.675 
D) 675 
E) 270

Question 19

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide:
Pb2+(aq)+ 2I-(aq)→ PbI2(s)
Lead iodide is virtually insoluble in water so that the reaction appears to go to completion.How many milliliters of 3.550 M HI(aq)must be added to a solution containing 0.700 mol of Pb(NO3)2(aq)to completely precipitate the lead?

Accepted Answer

A) 2.54 × 10-3 mL 
B) 394 mL 
C) 197 mL 
D) 0.197 mL 
E) 0.394 mL

Question 20

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2?
2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)

Accepted Answer

A) 53.1 g 
B) 81.7 g 
C) 126 g 
D) 283 g

Exam 4: Chemical Quantities and Aqueous Reactions

Explain the difference between a strong and weak electrolyte.Give an example of each.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

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? 3 Fe(s) + 4 H₂O(l) → Fe₃O₄(s) + 4 H₂(g)

In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H₂SO₄ solution?

What volume of a 0.540 M NaOH solution contains 11.5 g of NaOH?

The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H₂SO₄ solution (in M) ?

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

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 6.20 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Which of the following is not a strong electrolyte?

Which of the compounds H₂C₂O₄,Ca(OH) ₂,KOH,and HI,behave as bases when they are dissolved in water?

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?

Determine the oxidation state of Cl in NaClO₃.

How many moles of CH₃CH₂OH are contained in 548 mL of 0.0788 M CH₃CH₂OH solution?

What mass of N₂ will be produced from the reaction of 50.0 g N₂O₄ with 45.0 g N₂H₄? N₂O₄(l) + 2 N₂H₄(l) → 3 N₂(g) + 4 H₂O(g)

Match the following. -Mg(s) + Cu(NO₃) ₂(aq) → Mg(NO₃) ₂(aq) + Cu(s)

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Fe(s)

How many milliliters of a stock solution of 11.1 M HNO₃ would be needed to prepare 0.500 L of 0.500 M HNO₃?

A stock solution of HNO₃ is prepared and found to contain 13.5 M of HNO₃.If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,the concentration of the diluted solution is ________ M.

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

Exam 4: Chemical Quantities and Aqueous Reactions

Explain the difference between a strong and weak electrolyte.Give an example of each.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

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? 3 Fe(s) + 4 H2O(l) → Fe3O4(s) + 4 H2(g)

In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H2SO4 solution?

What volume of a 0.540 M NaOH solution contains 11.5 g of NaOH?

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H2SO4 solution (in M) ?

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

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 6.20 g of carbonic acid? H2CO3 → H2O + CO2

Which of the following is not a strong electrolyte?

Which of the compounds H2C2O4,Ca(OH) 2,KOH,and HI,behave as bases when they are dissolved in water?

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?

Determine the oxidation state of Cl in NaClO3.

How many moles of CH3CH2OH are contained in 548 mL of 0.0788 M CH3CH2OH solution?

What mass of N2 will be produced from the reaction of 50.0 g N2O4 with 45.0 g N2H4? N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

Match the following. -Mg(s) + Cu(NO3) 2(aq) → Mg(NO3) 2(aq) + Cu(s)

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction. Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)

How many milliliters of a stock solution of 11.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?

A stock solution of HNO3 is prepared and found to contain 13.5 M of HNO3.If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,the concentration of the diluted solution is ________ M.

If the percent yield for the following reaction is 65.0%,how many grams of KClO3 are needed to produce 32.0 g of O2? 2 KClO3(s) → 2 KCl(s) + 3 O2(g)

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

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? 3 Fe(s) + 4 H₂O(l) → Fe₃O₄(s) + 4 H₂(g)

In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H₂SO₄ solution?

The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H₂SO₄ solution (in M) ?

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

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 6.20 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Which of the compounds H₂C₂O₄,Ca(OH) ₂,KOH,and HI,behave as bases when they are dissolved in water?

Determine the oxidation state of Cl in NaClO₃.

How many moles of CH₃CH₂OH are contained in 548 mL of 0.0788 M CH₃CH₂OH solution?

What mass of N₂ will be produced from the reaction of 50.0 g N₂O₄ with 45.0 g N₂H₄? N₂O₄(l) + 2 N₂H₄(l) → 3 N₂(g) + 4 H₂O(g)

Match the following. -Mg(s) + Cu(NO₃) ₂(aq) → Mg(NO₃) ₂(aq) + Cu(s)

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Fe(s)

How many milliliters of a stock solution of 11.1 M HNO₃ would be needed to prepare 0.500 L of 0.500 M HNO₃?

A stock solution of HNO₃ is prepared and found to contain 13.5 M of HNO₃.If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,the concentration of the diluted solution is ________ M.

If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)