Question 1

A balanced equation has the same numbers and kinds of ________ on both sides of the reaction arrow.

Accepted Answer

The answer of A balanced equation has the same numbers...

Question 2

If 100.mL of 0.400 M Na2SO4 is added to 200.mL of 0.600 M NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

Accepted Answer

A) 0)534 M 
B) 0)667 M 
C) 1)00 M 
D) 1)40 M 
A) 0)534 M 
B) 0)667 M 
C) 1)00 M 
D) 1)40 M

Question 3

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced?
3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

Accepted Answer

A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g 
A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g

Question 4

Oxygen can be produced from the catalytic decomposition of KClO3 as shown in the balanced equation below.
2 KClO3 → 2 KCl + 3 O2
What is the percent yield if 3.20 grams of oxygen are formed from the reaction of 12.3 grams of KClO3?

Accepted Answer

Question 5

Assume that the unshaded spheres in the buret represent HS1U1P1+S1S1P0 ions,the shaded spheres in the flask represent OHS1U1P1-S1S1P0 ions,and you are carrying out a titration of the base with the acid.  
-If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M,what is the concentration of the base in the flask?

Accepted Answer

A) 0)167 M 
B) 0)250 M 
C) 0)375 M 
D) 0)667 M 
A) 0)167 M 
B) 0)250 M 
C) 0)375 M 
D) 0)667 M

Question 6

In the reaction between glucose and oxygen,10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed.What is the percent yield if the density of CO2 is 1.26 g/L?
C6H12O6(s)+ 6 O2(g)→ 6 CO2(g)+ 6 H2O(l)

Accepted Answer

A) 26.1% 
B) 40.6% 
C) 43.1% 
D) 64.5% 
A) 26.1% 
B) 40.6% 
C) 43.1% 
D) 64.5%

Question 7

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 10.0 g of aluminum.
_____ Al(s)+ _____ I2(s)→ _____ Al2I6(s)

Accepted Answer

A) 0)247 mol 
B) 0)556 mol 
C) 0)741 mol 
D) 1)11 mol 
A) 0)247 mol 
B) 0)556 mol 
C) 0)741 mol 
D) 1)11 mol

Question 8

Which conducts electricity?

Accepted Answer

A) A large collection of iron atoms 
B) A single iron atom 
C) Both a large collection of iron atoms and a single iron atom 
D) Neither a large collection of iron atoms nor a single iron atom 
A) A large collection of iron atoms 
B) A single iron atom 
C) Both a large collection of iron atoms and a single iron atom 
D) Neither a large collection of iron atoms nor a single iron atom

Question 9

Balance the chemical equation given below,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25°C? The density of nitrogen monoxide at 25°C is 1.23 g/L.
_____ NH3(g)+ _____ O2(g)→ _____ NO(g)+ _____ H2O(l)

Accepted Answer

A) 7)32 L 
B) 11.1 L 
C) 11.5 L 
D) 18.8 L 
A) 7)32 L 
B) 11.1 L 
C) 11.5 L 
D) 18.8 L

Question 10

What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon,10.51% hydrogen,and 39.52% fluorine by mass?

Accepted Answer

A) C2H5F 
B) C4H10F2 
C) C4H10F4 
D) C25F2 
A) C2H5F 
B) C4H10F2 
C) C4H10F4 
D) C25F2

Question 11

How many cations are in 10.0 g of sodium phosphate?

Accepted Answer

A) 3)67 × 1022 cations 
B) 1)10 × 1023 cations 
C) 9)87 × 1024 cations 
D) 2)96 × 1025 cations 
A) 3)67 × 1022 cations 
B) 1)10 × 1023 cations 
C) 9)87 × 1024 cations 
D) 2)96 × 1025 cations

Question 12

How many milliliters of 0.550 M hydriodic acid are needed to react with 15.00 mL of 0.217 M CsOH?
HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

Accepted Answer

A) 0)0263 mL 
B) 0)169 mL 
C) 5)92 mL 
D) 38.0 mL 
A) 0)0263 mL 
B) 0)169 mL 
C) 5)92 mL 
D) 38.0 mL

Question 13

How many milliliters of 0.260 M Na2S are needed to react with 40.00 mL of 0.315 M AgNO3?
Na2S(aq)+ 2 AgNO3(aq)→ 2 NaNO3(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 14

What is the concentration of NO3- ions in a solution prepared by dissolving 15.0 g of Ca(NO3)2 in enough water to produce 300.mL of solution?

Accepted Answer

A) 0)152 M 
B) 0)305 M 
C) 0)403 M 
D) 0)609 M 
A) 0)152 M 
B) 0)305 M 
C) 0)403 M 
D) 0)609 M

Question 15

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.25 L of a 3.5 M H2SO4 solution?

Accepted Answer

A) 0)097 mL 
B) 0)64 mL 
C) 97 mL 
D) 640 mL 
A) 0)097 mL 
B) 0)64 mL 
C) 97 mL 
D) 640 mL

Question 16

10 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is false?
N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 2.8 grams of hydrogen are left over. 
B) Hydrogen is the excess reactant. 
C) Nitrogen is the limiting reactant. 
D) The theoretical yield of ammonia is 15 g. 
A) 2.8 grams of hydrogen are left over. 
B) Hydrogen is the excess reactant. 
C) Nitrogen is the limiting reactant. 
D) The theoretical yield of ammonia is 15 g.

Question 17

How many grams of CaCl2 are formed when 15.00 mL of 0.00237 M Ca(OH)2 reacts with excess Cl2 gas?
2 Ca(OH)2(aq)+ 2 Cl2(g)→ Ca(OCl)2(aq)+ CaCl2(s)+ 2 H2O(l)

Accepted Answer

A) 0)00 197 g 
B) 0)00 394 g 
C) 0)0 0789 g 
D) 0)0 507 g 
A) 0)00 197 g 
B) 0)00 394 g 
C) 0)0 0789 g 
D) 0)0 507 g

Question 18

What is the molar mass of aspartic acid,C4O4H7N?

Accepted Answer

A) 43 g/mol 
B) 70 g/mol 
C) 133 g/mol 
D) 197 g/mol 
A) 43 g/mol 
B) 70 g/mol 
C) 133 g/mol 
D) 197 g/mol

Question 19

The following diagram represents the reaction of A2 (unshaded spheres)with B (shaded spheres).What is the balanced chemical equation for this reaction,and what is the limiting reactant?

Accepted Answer

A) A2 + 2B → 2AB;A2 is the limiting reactant. 
B) A2 + 2B → 2AB;B is the limiting reactant. 
C) 4A2 + 6B → 6AB;A2 is the limiting reactant. 
D) 4A2 + 6B → 6AB;B is the limiting reactant. 
A) A2 + 2B → 2AB;A2 is the limiting reactant. 
B) A2 + 2B → 2AB;B is the limiting reactant. 
C) 4A2 + 6B → 6AB;A2 is the limiting reactant. 
D) 4A2 + 6B → 6AB;B is the limiting reactant.

Question 20

What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients?
_____ B2O3(s)+ _____ HF(l)→ _____ BF3(g)+ _____ H2O(l)

Accepted Answer

A) 8 
B) 11 
C) 15 
D) none of these 
A) 8 
B) 11 
C) 15 
D) none of these

Exam 3: Formulas, equations, and Moles

A balanced equation has the same numbers and kinds of ________ on both sides of the reaction arrow.

If 100.mL of 0.400 M Na2SO4 is added to 200.mL of 0.600 M NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced? 3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

Oxygen can be produced from the catalytic decomposition of KClO3 as shown in the balanced equation below. 2 KClO3 → 2 KCl + 3 O2 What is the percent yield if 3.20 grams of oxygen are formed from the reaction of 12.3 grams of KClO3?

In the reaction between glucose and oxygen,10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed.What is the percent yield if the density of CO2 is 1.26 g/L? C6H12O6(s)+ 6 O2(g)→ 6 CO2(g)+ 6 H2O(l)

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 10.0 g of aluminum. _____ Al(s)+ _____ I2(s)→ _____ Al2I6(s)

Which conducts electricity?

Balance the chemical equation given below,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25°C? The density of nitrogen monoxide at 25°C is 1.23 g/L. _____ NH3(g)+ _____ O2(g)→ _____ NO(g)+ _____ H2O(l)

What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon,10.51% hydrogen,and 39.52% fluorine by mass?

How many cations are in 10.0 g of sodium phosphate?

How many milliliters of 0.550 M hydriodic acid are needed to react with 15.00 mL of 0.217 M CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H2O(l)

How many milliliters of 0.260 M Na2S are needed to react with 40.00 mL of 0.315 M AgNO3? Na2S(aq)+ 2 AgNO3(aq)→ 2 NaNO3(aq)+ Ag2S(s)

What is the concentration of NO3- ions in a solution prepared by dissolving 15.0 g of Ca(NO3)2 in enough water to produce 300.mL of solution?

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.25 L of a 3.5 M H2SO4 solution?

10 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is false? N2(g)+ 3 H2(g)→ 2 NH3(g)

How many grams of CaCl2 are formed when 15.00 mL of 0.00237 M Ca(OH)2 reacts with excess Cl2 gas? 2 Ca(OH)2(aq)+ 2 Cl2(g)→ Ca(OCl)2(aq)+ CaCl2(s)+ 2 H2O(l)

What is the molar mass of aspartic acid,C4O4H7N?

The following diagram represents the reaction of A2 (unshaded spheres)with B (shaded spheres).What is the balanced chemical equation for this reaction,and what is the limiting reactant?

What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? _____ B2O3(s)+ _____ HF(l)→ _____ BF3(g)+ _____ H2O(l)

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

If 100.mL of 0.400 M Na₂SO₄ is added to 200.mL of 0.600 M NaCl,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq),are produced? 3 NO₂(g)+ H₂O(l)→ 2 HNO₃(aq)+ NO(g)

Oxygen can be produced from the catalytic decomposition of KClO₃ as shown in the balanced equation below. 2 KClO₃ → 2 KCl + 3 O₂ What is the percent yield if 3.20 grams of oxygen are formed from the reaction of 12.3 grams of KClO₃?

In the reaction between glucose and oxygen,10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed.What is the percent yield if the density of CO₂ is 1.26 g/L? C₆H₁₂O₆(s)+ 6 O₂(g)→ 6 CO₂(g)+ 6 H₂O(l)

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 10.0 g of aluminum. ___ Al(s)+ _ I₂(s)→ ___ Al₂I₆(s)

Balance the chemical equation given below,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25°C? The density of nitrogen monoxide at 25°C is 1.23 g/L. ___ NH₃(g)+ _ O₂(g)→ _ NO(g)+ ___ H₂O(l)

How many milliliters of 0.550 M hydriodic acid are needed to react with 15.00 mL of 0.217 M CsOH? HI(aq)+ CsOH(aq)→ CsI(aq)+ H₂O(l)

How many milliliters of 0.260 M Na₂S are needed to react with 40.00 mL of 0.315 M AgNO₃? Na₂S(aq)+ 2 AgNO₃(aq)→ 2 NaNO₃(aq)+ Ag₂S(s)

What is the concentration of NO₃^- ions in a solution prepared by dissolving 15.0 g of Ca(NO₃)₂ in enough water to produce 300.mL of solution?

How many milliliters of a 9.0 M H₂SO₄ solution are needed to make 0.25 L of a 3.5 M H₂SO₄solution?

10 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is false? N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

How many grams of CaCl₂ are formed when 15.00 mL of 0.00237 M Ca(OH)₂ reacts with excess Cl₂ gas? 2 Ca(OH)₂(aq)+ 2 Cl₂(g)→ Ca(OCl)₂(aq)+ CaCl₂(s)+ 2 H₂O(l)

What is the molar mass of aspartic acid,C₄O₄H₇N?

The following diagram represents the reaction of A₂ (unshaded spheres)with B (shaded spheres).What is the balanced chemical equation for this reaction,and what is the limiting reactant?

What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? ___ B₂O₃(s)+ _ HF(l)→ _ BF₃(g)+ ___ H₂O(l)