Question 1

All of the following may change during a chemical reaction except

Accepted Answer

A) the total number of atoms in the system. 
B) the temperature of the system. 
C) the color of the system. 
D) the total number of molecules in the system. 
E) the physical state of the system. 
A) the total number of atoms in the system. 
B) the temperature of the system. 
C) the color of the system. 
D) the total number of molecules in the system. 
E) the physical state of the system.

Question 2

An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H2SO4. Is sodium hydroxide or sulfuric acid the limiting reactant?

Accepted Answer

To determine the limiting reactant in a

Question 3

Given that 4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g), if 6.3 moles of NH3 react with sufficient oxygen, how many moles of NO should form?

Accepted Answer

A) 4.0 moles 
B) 6.3 moles 
C) 6.0 moles 
D) 5.0 moles 
E) 3.2 moles 
A) 4.0 moles 
B) 6.3 moles 
C) 6.0 moles 
D) 5.0 moles 
E) 3.2 moles

Question 4

When the mixture of molecules shown in the molecular-level image undergoes complete reaction, all of these molecules are converted to products. Which of the following reactions could this represent?

Accepted Answer

A) N2 + O2 → 2NO 
B) N2 + 2Cl2 → N2Cl4 
C) N2 + 2O2 → 2NO2 
D) N2 + 3H2 → 2NH3 
E) N2 + 3O2 → 2NO3 
A) N2 + O2 → 2NO 
B) N2 + 2Cl2 → N2Cl4 
C) N2 + 2O2 → 2NO2 
D) N2 + 3H2 → 2NH3 
E) N2 + 3O2 → 2NO3

Question 5

When sulfur dioxide is formed from its elements, 296.8 kJ of energy is released. Convert this energy to units of calories.

Accepted Answer

A) 70.94 cal 
B) 7.094 x 104 cal 
C) 0.2968 cal 
D) 1.242 x 103 cal 
E) 1.242 x 106 cal 
A) 70.94 cal 
B) 7.094 x 104 cal 
C) 0.2968 cal 
D) 1.242 x 103 cal 
E) 1.242 x 106 cal

Question 6

When 3.0 mol CaCl2 dissolves in water, how many moles of ions are in solution?

Accepted Answer

A) 1.0 mole 
B) 3.0 moles 
C) 6.0 moles 
D) 9.0 moles 
E) 12 moles 
A) 1.0 mole 
B) 3.0 moles 
C) 6.0 moles 
D) 9.0 moles 
E) 12 moles

Question 7

In a bomb calorimeter, the bomb itself, the water surrounding it, and the thermometer would be considered part of the "system."

Accepted Answer

A) True 
 B)False

Question 8

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g)+ ___H2(g)→ ___NH3(g)(unbalanced)Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

Accepted Answer

A) 1.82 g 
B) 3.64 g 
C) 5.45 g 
D) 1.34 g 
E) 0.891 
A) 1.82 g 
B) 3.64 g 
C) 5.45 g 
D) 1.34 g 
E) 0.891

Question 9

When fats or other foods are burned in a bomb calorimeter, the calorimeter absorbs heat, so the reaction is endothermic.

Accepted Answer

A) True 
 B)False

Question 10

Consider the reaction N2(g)+ 2O2(g)→ 2NO2(g). The molecular image represents a mixture of N2(g)and O2(g)just before reaction occurs. What is the limiting reactant, and how much of the excess reactant remains after the reaction is complete? The image contains 3 N2 molecules and 9 O2 molecules.

Accepted Answer

A) N2(g), 6 O2(g) 
B) O2(g), 1 N2(g) 
C) N2(g), 3 O2(g) 
D) O2(g), 2 N2(g) 
E) N2(g), 7 O2(g) 
A) N2(g), 6 O2(g) 
B) O2(g), 1 N2(g) 
C) N2(g), 3 O2(g) 
D) O2(g), 2 N2(g) 
E) N2(g), 7 O2(g)

Question 11

When phosphorus reacts with chlorine, phosphorus trichloride is formed according to the equation: ___P4(s)+ ___Cl2(g)→ ___PCl3(l)(unbalanced)Balance the equation and determine how many grams of phosphorus reactant would be required to produce 25.0 g of phosphorus trichloride, assuming there is sufficient chlorine available.

Accepted Answer

A) 22.6 g 
B) 45.1 g 
C) 5.64 g 
D) 111 g 
E) 90.2 g 
A) 22.6 g 
B) 45.1 g 
C) 5.64 g 
D) 111 g 
E) 90.2 g

Question 12

Consider the following reaction: 3NO2(g)+ H2O(l)→ 2HNO3(l)+ NO(g)How many moles of NO2 are required to react with 1.50 moles of H2O to form 3.00 moles of HNO3?

Accepted Answer

A) 1.50 mol 
B) 3.00 mol 
C) 4.00 mol 
D) 4.50 mol 
E) 9.00 mol 
A) 1.50 mol 
B) 3.00 mol 
C) 4.00 mol 
D) 4.50 mol 
E) 9.00 mol

Question 13

In photosynthesis, plants convert carbon dioxide and water into glucose, C6H12O6, according to the reaction: 6CO2(g)+ 6H2O(l)→ 6O2(g)+ C6H12O6(g)If 75.2 g of glucose are obtained when 131 g of CO2 react in the presence of excess H2O, what is the percent yield of the reaction? Report your answer with the correct number of significant figures.

Accepted Answer

To calculate the percent yield of the re

Question 14

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s)+ 3H2SO4(aq)→ Al2(SO4)3(s)+ 3H2(g)If 12.9 g of aluminum reacts with excess sulfuric acid, and 62.4 g of Al2(SO4)3 are collected, what is the percent yield of Al2(SO4)3?

Accepted Answer

A) 81.8% 
B) 49.5% 
C) 76.3% 
D) 131% 
E) not enough information given 
A) 81.8% 
B) 49.5% 
C) 76.3% 
D) 131% 
E) not enough information given

Question 15

When mixed, solutions of aluminum nitrate, Al(NO3)3, and ammonium carbonate, (NH4)2CO3, will form a precipitate of aluminum carbonate, Al2(CO3)3. The balanced equation is 2Al(NO3)3(aq)+ 3(NH4)2CO3(aq)→ Al2(CO3)3 (s)+ 6NH4NO3(aq)Which of the following statements regarding this reaction is incorrect?

Accepted Answer

A) 2 moles of Al(NO3)3 will react with 3 moles of (NH4)2CO3. 
B) If 6 moles of (NH4)2CO3 react with sufficient Al(NO3)3, 2 moles of Al2(CO3)3 should form. 
C) If 0.5 mole of (NH4)2CO3 react with sufficient Al(NO3)3, 3 moles of Al2(CO3)3 should form. 
D) If 1.5 moles of Al2(CO3)3 are formed, given sufficient starting materials, then 9 moles of NH4NO3 should also form. 
E) 4 moles of Al(NO3)3 will react with 6 moles of (NH4)2CO3. 
A) 2 moles of Al(NO3)3 will react with 3 moles of (NH4)2CO3. 
B) If 6 moles of (NH4)2CO3 react with sufficient Al(NO3)3, 2 moles of Al2(CO3)3 should form. 
C) If 0.5 mole of (NH4)2CO3 react with sufficient Al(NO3)3, 3 moles of Al2(CO3)3 should form. 
D) If 1.5 moles of Al2(CO3)3 are formed, given sufficient starting materials, then 9 moles of NH4NO3 should also form. 
E) 4 moles of Al(NO3)3 will react with 6 moles of (NH4)2CO3.

Question 16

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s)+ 3O2(g)→ 2PbO(s)+ 2SO2(g)If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

Accepted Answer

A) 116 g 
B) 46.6 g 
C) 163 g 
D) 69.9 g 
E) 93.2 g 
A) 116 g 
B) 46.6 g 
C) 163 g 
D) 69.9 g 
E) 93.2 g

Question 17

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

Accepted Answer

A) Six sandwiches could be made, and two pickle slices would be left over. 
B) Four sandwiches could be made, and four slices of bread and eight pickle slices would be left over. 
C) Five sandwiches could be made, and two slices of bread and five pickle slices would be left over. 
D) Twelve sandwiches could be made, and there would be no leftovers. 
E) Five sandwiches could be made, and two slices of bread and no pickle slices would be left over. 
A) Six sandwiches could be made, and two pickle slices would be left over. 
B) Four sandwiches could be made, and four slices of bread and eight pickle slices would be left over. 
C) Five sandwiches could be made, and two slices of bread and five pickle slices would be left over. 
D) Twelve sandwiches could be made, and there would be no leftovers. 
E) Five sandwiches could be made, and two slices of bread and no pickle slices would be left over.

Question 18

When ammonium carbonate, (NH4)2CO3, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Accepted Answer

A) (NH4)22+(aq)+ CO32−(aq) 
B) 2NH4+(aq)+ CO32−(aq) 
C) 2N3−(aq)+ 4H+(aq)+ CO32−(aq) 
D) 2N3−(aq)+ 4H+(aq)+ C(s)+ O32−(aq) 
E) 2N3−(aq)+ 4H+(aq)+ C4+(aq)+ 3O2−(aq) 
A) (NH4)22+(aq)+ CO32−(aq) 
B) 2NH4+(aq)+ CO32−(aq) 
C) 2N3−(aq)+ 4H+(aq)+ CO32−(aq) 
D) 2N3−(aq)+ 4H+(aq)+ C(s)+ O32−(aq) 
E) 2N3−(aq)+ 4H+(aq)+ C4+(aq)+ 3O2−(aq)

Question 19

When blue copper(II)sulfate pentahydrate is heated, it decomposes according to the equation given below, forming light blue copper(II)sulfate and water vapor. CuSO4·5H2O(s)→ CuSO4(s)+ 5H2O(g)If a 5.00 g sample of CuSO4·5H2O is heated, what mass of CuSO4 will be formed when the reaction is complete? Report your answer with the correct number of significant figures and correct units.

Accepted Answer

It seems that there is a formatting issu

Question 20

When calculating the percent yield for a reaction, the only information necessary is the mass of each reactant.

Accepted Answer

A) True 
 B)False

All of the following may change during a chemical reaction except

An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H₂SO₄. Is sodium hydroxide or sulfuric acid the limiting reactant?

Given that 4NH₃(g)+ 5O₂(g)→ 4NO(g)+ 6H₂O(g), if 6.3 moles of NH₃ react with sufficient oxygen, how many moles of NO should form?

When the mixture of molecules shown in the molecular-level image undergoes complete reaction, all of these molecules are converted to products. Which of the following reactions could this represent?

When sulfur dioxide is formed from its elements, 296.8 kJ of energy is released. Convert this energy to units of calories.

When 3.0 mol CaCl₂ dissolves in water, how many moles of ions are in solution?

In a bomb calorimeter, the bomb itself, the water surrounding it, and the thermometer would be considered part of the "system."

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g)→ ___NH₃(g)(unbalanced)Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

When fats or other foods are burned in a bomb calorimeter, the calorimeter absorbs heat, so the reaction is endothermic.

Consider the following reaction: 3NO₂(g)+ H₂O(l)→ 2HNO₃(l)+ NO(g)How many moles of NO₂ are required to react with 1.50 moles of H₂O to form 3.00 moles of HNO₃?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s)+ 3H₂SO₄(aq)→ Al₂(SO₄)₃(s)+ 3H₂(g)If 12.9 g of aluminum reacts with excess sulfuric acid, and 62.4 g of Al2(SO₄)₃ are collected, what is the percent yield of Al₂(SO₄)₃?

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s)+ 3O₂(g)→ 2PbO(s)+ 2SO₂(g)If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

When ammonium carbonate, (NH₄)2CO₃, dissolves in water, the ions that are formed for each formula unit that dissolves are:

When calculating the percent yield for a reaction, the only information necessary is the mass of each reactant.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

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Exam 6: Quantities in Chemical Reactions

All of the following may change during a chemical reaction except

An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H2SO4. Is sodium hydroxide or sulfuric acid the limiting reactant?

Given that 4NH3(g)+ 5O2(g)→ 4NO(g)+ 6H2O(g), if 6.3 moles of NH3 react with sufficient oxygen, how many moles of NO should form?

When the mixture of molecules shown in the molecular-level image undergoes complete reaction, all of these molecules are converted to products. Which of the following reactions could this represent?

When sulfur dioxide is formed from its elements, 296.8 kJ of energy is released. Convert this energy to units of calories.

When 3.0 mol CaCl2 dissolves in water, how many moles of ions are in solution?

In a bomb calorimeter, the bomb itself, the water surrounding it, and the thermometer would be considered part of the "system."

Nitrogen and hydrogen react together to form ammonia according to the equation: ___N2(g)+ ___H2(g)→ ___NH3(g)(unbalanced)Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

When fats or other foods are burned in a bomb calorimeter, the calorimeter absorbs heat, so the reaction is endothermic.

Consider the reaction N2(g)+ 2O2(g)→ 2NO2(g). The molecular image represents a mixture of N2(g)and O2(g)just before reaction occurs. What is the limiting reactant, and how much of the excess reactant remains after the reaction is complete? The image contains 3 N2 molecules and 9 O2 molecules.

Consider the following reaction: 3NO2(g)+ H2O(l)→ 2HNO3(l)+ NO(g)How many moles of NO2 are required to react with 1.50 moles of H2O to form 3.00 moles of HNO3?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s)+ 3H2SO4(aq)→ Al2(SO4)3(s)+ 3H2(g)If 12.9 g of aluminum reacts with excess sulfuric acid, and 62.4 g of Al2(SO4)3 are collected, what is the percent yield of Al2(SO4)3?

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s)+ 3O2(g)→ 2PbO(s)+ 2SO2(g)If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

If you wish to make sandwiches which consist of two slices of bread, one ham slice, and three pickle slices, how many sandwiches could you make if you have 12 slices of bread, five slices of ham, and 20 pickle slices, and what would be left over?

When ammonium carbonate, (NH4)2CO3, dissolves in water, the ions that are formed for each formula unit that dissolves are:

When calculating the percent yield for a reaction, the only information necessary is the mass of each reactant.

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H₂SO₄. Is sodium hydroxide or sulfuric acid the limiting reactant?

Given that 4NH₃(g)+ 5O₂(g)→ 4NO(g)+ 6H₂O(g), if 6.3 moles of NH₃ react with sufficient oxygen, how many moles of NO should form?

When 3.0 mol CaCl₂ dissolves in water, how many moles of ions are in solution?

Nitrogen and hydrogen react together to form ammonia according to the equation: _N₂(g)+ _H₂(g)→ ___NH₃(g)(unbalanced)Balance the equation, and determine how many grams of hydrogen would be required to react with 25.2 g of nitrogen.

Consider the following reaction: 3NO₂(g)+ H₂O(l)→ 2HNO₃(l)+ NO(g)How many moles of NO₂ are required to react with 1.50 moles of H₂O to form 3.00 moles of HNO₃?

Aluminum metal reacts with sulfuric acid according to the following equation: 2Al(s)+ 3H₂SO₄(aq)→ Al₂(SO₄)₃(s)+ 3H₂(g)If 12.9 g of aluminum reacts with excess sulfuric acid, and 62.4 g of Al2(SO₄)₃ are collected, what is the percent yield of Al₂(SO₄)₃?

In the process of obtaining lead from PbS, or galena, the galena is "roasted" (heated in the presence of oxygen), so that the following reaction occurs: 2PbS(s)+ 3O₂(g)→ 2PbO(s)+ 2SO₂(g)If 50.0 g of PbS are mixed with 25.0 g of oxygen, how many grams of PbO should form?

When ammonium carbonate, (NH₄)2CO₃, dissolves in water, the ions that are formed for each formula unit that dissolves are: