Question 1

If the theoretical yield for a reaction is 29.4 g, and 28.7 g of product are actually obtained, what is the percent yield?

Accepted Answer

A) 0.976% 
B) 102% 
C) 97.6% 
D) 0.700% 
E) not enough information given 
A) 0.976% 
B) 102% 
C) 97.6% 
D) 0.700% 
E) not enough information given

Question 2

A pamphlet requires one cover, 14 pieces of white paper, and three sheets of colored paper. How many pamphlets could be made, and what would be left over, if there are 50 covers, 500 sheets of white paper, and 100 sheets of colored paper available?

Accepted Answer

A) 33 pamphlets could be made, and one sheet of colored paper, 38 sheets of white paper, and 17 covers would be left over. 
B) 50 pamphlets could be made, and there would be no leftovers. 
C) 650 pamphlets could be made, and there would be no leftovers. 
D) 34 pamphlets could be made, and 24 sheets of white paper and 16 covers would be left over. 
E) 35 pamphlets could be made, and 10 sheets of white paper and 15 covers would be left over. 
A) 33 pamphlets could be made, and one sheet of colored paper, 38 sheets of white paper, and 17 covers would be left over. 
B) 50 pamphlets could be made, and there would be no leftovers. 
C) 650 pamphlets could be made, and there would be no leftovers. 
D) 34 pamphlets could be made, and 24 sheets of white paper and 16 covers would be left over. 
E) 35 pamphlets could be made, and 10 sheets of white paper and 15 covers would be left over.

Question 3

The following reaction releases 2800 kJ of heat for each mole of C6H12O6 that reacts. C6H12O6(s)+ 6O2(g)→ 6CO2(g)+ 6H2O(l)This reaction is

Accepted Answer

A) endothermic and has a positive value of q. 
B) exothermic and has a positive value of q. 
C) endothermic and has a negative value of q. 
D) exothermic and has a negative value of q. 
A) endothermic and has a positive value of q. 
B) exothermic and has a positive value of q. 
C) endothermic and has a negative value of q. 
D) exothermic and has a negative value of q.

Question 4

Nitrogen and hydrogen react together to form ammonia according to the following equation: ___N2(g)+ ___H2(g)→ ___NH3(g)(unbalanced)Balance the equation, and determine how many grams of hydrogen reactant would be required to produce 50.0 g of ammonia, assuming there is sufficient nitrogen available.

Accepted Answer

A) 4.46 g 
B) 5.94 g 
C) 4.81 g 
D) 8.91 g 
E) not enough information 
A) 4.46 g 
B) 5.94 g 
C) 4.81 g 
D) 8.91 g 
E) not enough information

Question 5

Aluminum reacts with oxygen according to the following reaction: 4Al(s)+ 3O2(g)→ 2Al2O3(s)If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al2O3 should form?

Accepted Answer

A) 4 moles 
B) 8 moles 
C) 6 moles 
D) 12 moles 
E) 20 moles 
A) 4 moles 
B) 8 moles 
C) 6 moles 
D) 12 moles 
E) 20 moles

Question 6

When potassium carbonate, K2CO3, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Accepted Answer

A) K22+(aq)+ CO32−(aq) 
B) 2K2+(aq)+ CO32−(aq) 
C) 2K+(aq)+ CO32−(aq) 
D) 2K+(aq)+ C(s)+ O32−(aq) 
E) K22+(aq)+ C4+(aq)+ 3O2−(aq) 
A) K22+(aq)+ CO32−(aq) 
B) 2K2+(aq)+ CO32−(aq) 
C) 2K+(aq)+ CO32−(aq) 
D) 2K+(aq)+ C(s)+ O32−(aq) 
E) K22+(aq)+ C4+(aq)+ 3O2−(aq)

Question 7

Nitrogen monoxide reacts with oxygen according to the following reaction: 2NO(g)+ O2(g)→ 2NO2(g)If 10 moles of nitrogen monoxide are combined with 4 moles of oxygen, how many moles of NO2 should form?

Accepted Answer

A) 4 moles 
B) 8 moles 
C) 10 moles 
D) 12 moles 
E) 14 moles 
A) 4 moles 
B) 8 moles 
C) 10 moles 
D) 12 moles 
E) 14 moles

Question 8

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s)+ 3Cl2(g)→ 2FeCl3(s)If 35.0 g each of iron and chlorine are combined, how much FeCl3 should form?

Accepted Answer

A) 102 g 
B) 155 g 
C) 53.4 g 
D) 80.0 g 
E) 68.0 g 
A) 102 g 
B) 155 g 
C) 53.4 g 
D) 80.0 g 
E) 68.0 g

Question 9

If 75.0 J of heat energy is added to 25.0 g samples of different metals. Given their specific heat values, rank the metals in order from least to greatest final temperature.

Accepted Answer

A) Au < Ag < Cu < Cr < Al 
B) Al < Cr < Cu < Ag < Au 
C) Au < Ag < Al < Cr < Cu 
D) Cr < Cu < Al < Ag < Au 
E) none of these-all final temperatures would be equal 
A) Au < Ag < Cu < Cr < Al 
B) Al < Cr < Cu < Ag < Au 
C) Au < Ag < Al < Cr < Cu 
D) Cr < Cu < Al < Ag < Au 
E) none of these-all final temperatures would be equal

Question 10

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 50.4 g of nitrogen.

Accepted Answer

A) 10.9 g 
B) 3.64 g 
C) 7.28 g 
D) 2.68 g 
E) 1.78 g 
A) 10.9 g 
B) 3.64 g 
C) 7.28 g 
D) 2.68 g 
E) 1.78 g

Question 11

When ethanol, C2H5OH, a component in some gasoline mixtures, is burned in air, one molecule of ethanol combines with three oxygen molecules to form two CO2 molecules and three H2O molecules. Select the statement below that is incorrect in regard to this reaction.

Accepted Answer

A) The balanced equation for the reaction is C2H5OH + 3O2 → 2CO2 + 3H2O. 
B) If 4 ethanol molecules react, 8 CO2 molecules should form. 
C) If 12 H2O molecules are formed, then 9 O2 molecules must have reacted. 
D) If 15 ethanol molecules react, then 45 oxygen molecules must also react. 
E) If 12 CO2 molecules are formed, then 18 H2O molecules should also form. 
A) The balanced equation for the reaction is C2H5OH + 3O2 → 2CO2 + 3H2O. 
B) If 4 ethanol molecules react, 8 CO2 molecules should form. 
C) If 12 H2O molecules are formed, then 9 O2 molecules must have reacted. 
D) If 15 ethanol molecules react, then 45 oxygen molecules must also react. 
E) If 12 CO2 molecules are formed, then 18 H2O molecules should also form.

Question 12

Consider the following reaction: 3NO2(g)+ H2O(l)→ 2HNO3(l)+ NO(g)How many moles of the excess reactant remain if 4.00 moles of H2O and 10.00 moles of NO2 are mixed?

Accepted Answer

A) 0.67 mol H2O 
B) 2.00 mol NO2 
C) 3.33 mol H2O 
D) 6.00 mol NO2 
E) 8.00 mol NO2 
A) 0.67 mol H2O 
B) 2.00 mol NO2 
C) 3.33 mol H2O 
D) 6.00 mol NO2 
E) 8.00 mol NO2

Question 13

The following reaction absorbs 393 kJ of heat for each mole of CO2 that reacts. CO2(g)→ C(s)+ O2(g)This reaction

Accepted Answer

A) is endothermic and has a positive value of q. 
B) is exothermic and has a positive value of q. 
C) is endothermic and has a negative value of q. 
D) is exothermic and has a negative value of q. 
A) is endothermic and has a positive value of q. 
B) is exothermic and has a positive value of q. 
C) is endothermic and has a negative value of q. 
D) is exothermic and has a negative value of q.

Question 14

A can of soda has 1.50 x 102 Calories. Convert this energy to units of joules.

Accepted Answer

A) 628 J 
B) 6280 J 
C) 35.9 J 
D) 3.59 x 104 J 
E) 6.28 x 105 J 
A) 628 J 
B) 6280 J 
C) 35.9 J 
D) 3.59 x 104 J 
E) 6.28 x 105 J

Question 15

What is the heat change when a 225 g sample of olive oil [Cwater = 1.79 J/(g°C)] is cooled from 95.8°C to 52.1°C?

Accepted Answer

A) 9.83 x 103 J 
B) −9.83 x 103 J 
C) −1.76 x 104 J 
D) 1.76 x 104 J 
E) not enough information given 
A) 9.83 x 103 J 
B) −9.83 x 103 J 
C) −1.76 x 104 J 
D) 1.76 x 104 J 
E) not enough information given

Question 16

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s)+ Cl2(g)→ 2NaCl(s)If 12.5 g of sodium react with sufficient chlorine, how many grams of sodium chloride should form?

Accepted Answer

A) 15.9 g 
B) 31.8 g 
C) 63.6 g 
D) 4.92 g 
E) 9.84 g 
A) 15.9 g 
B) 31.8 g 
C) 63.6 g 
D) 4.92 g 
E) 9.84 g

Question 17

One calorie is the amount of heat energy required to raise the temperature of 10.0 g of water by 1°C.

Accepted Answer

A) True 
 B)False

Question 18

What is the heat change when a 26.8 g sample of water [Cwater = 4.184 J/(g°C)] is cooled from 75.6°C to 22.1°C?

Accepted Answer

A) 6.00 x 103 J 
B) −6.00 x 103 J 
C) 1.43 x 103 J 
D) −1.43 x 103 J 
E) not enough information given 
A) 6.00 x 103 J 
B) −6.00 x 103 J 
C) 1.43 x 103 J 
D) −1.43 x 103 J 
E) not enough information given

Question 19

Small amounts of oxygen gas can be produced for laboratory use by heating potassium chlorate, which causes it to decompose by the following reaction: ___KClO3(s)→ ____KCl(s)+ ___O2(g)(unbalanced)Balance the equation, and determine the mass of oxygen that should be formed if 15.0 g of potassium chlorate decomposes.

Accepted Answer

A) 11.7 g 
B) 57.5 g 
C) 173 g 
D) 5.88 g 
E) 86.1 g 
A) 11.7 g 
B) 57.5 g 
C) 173 g 
D) 5.88 g 
E) 86.1 g

Question 20

How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron [C = 0.448 J/(g°C)] from 22.0°C to 100.0°C?

Accepted Answer

A) 34.9 J 
B) 672 J 
C) 524 J 
D) 1.17 x 103 J 
E) not enough information given 
A) 34.9 J 
B) 672 J 
C) 524 J 
D) 1.17 x 103 J 
E) not enough information given

If the theoretical yield for a reaction is 29.4 g, and 28.7 g of product are actually obtained, what is the percent yield?

A pamphlet requires one cover, 14 pieces of white paper, and three sheets of colored paper. How many pamphlets could be made, and what would be left over, if there are 50 covers, 500 sheets of white paper, and 100 sheets of colored paper available?

The following reaction releases 2800 kJ of heat for each mole of C₆H₁₂O₆ that reacts. C₆H₁₂O₆(s)+ 6O₂(g)→ 6CO₂(g)+ 6H₂O(l)This reaction is

Aluminum reacts with oxygen according to the following reaction: 4Al(s)+ 3O₂(g)→ 2Al₂O₃(s)If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al₂O₃ should form?

When potassium carbonate, K₂CO₃, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Nitrogen monoxide reacts with oxygen according to the following reaction: 2NO(g)+ O₂(g)→ 2NO₂(g)If 10 moles of nitrogen monoxide are combined with 4 moles of oxygen, how many moles of NO₂ should form?

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s)+ 3Cl₂(g)→ 2FeCl₃(s)If 35.0 g each of iron and chlorine are combined, how much FeCl₃ should form?

If 75.0 J of heat energy is added to 25.0 g samples of different metals. Given their specific heat values, rank the metals in order from least to greatest final temperature.

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 50.4 g of nitrogen.

When ethanol, C₂H₅OH, a component in some gasoline mixtures, is burned in air, one molecule of ethanol combines with three oxygen molecules to form two CO₂ molecules and three H₂O molecules. Select the statement below that is incorrect in regard to this reaction.

Consider the following reaction: 3NO₂(g)+ H₂O(l)→ 2HNO₃(l)+ NO(g)How many moles of the excess reactant remain if 4.00 moles of H₂O and 10.00 moles of NO₂ are mixed?

The following reaction absorbs 393 kJ of heat for each mole of CO₂ that reacts. CO₂(g)→ C(s)+ O₂(g)This reaction

A can of soda has 1.50 x 10² Calories. Convert this energy to units of joules.

What is the heat change when a 225 g sample of olive oil [C_water = 1.79 J/(g°C)] is cooled from 95.8°C to 52.1°C?

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s)+ Cl₂(g)→ 2NaCl(s)If 12.5 g of sodium react with sufficient chlorine, how many grams of sodium chloride should form?

One calorie is the amount of heat energy required to raise the temperature of 10.0 g of water by 1°C.

What is the heat change when a 26.8 g sample of water [C_water = 4.184 J/(g°C)] is cooled from 75.6°C to 22.1°C?

How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron [C = 0.448 J/(g°C)] from 22.0°C to 100.0°C?

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

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Exam 6: Quantities in Chemical Reactions

If the theoretical yield for a reaction is 29.4 g, and 28.7 g of product are actually obtained, what is the percent yield?

A pamphlet requires one cover, 14 pieces of white paper, and three sheets of colored paper. How many pamphlets could be made, and what would be left over, if there are 50 covers, 500 sheets of white paper, and 100 sheets of colored paper available?

The following reaction releases 2800 kJ of heat for each mole of C6H12O6 that reacts. C6H12O6(s)+ 6O2(g)→ 6CO2(g)+ 6H2O(l)This reaction is

Aluminum reacts with oxygen according to the following reaction: 4Al(s)+ 3O2(g)→ 2Al2O3(s)If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al2O3 should form?

When potassium carbonate, K2CO3, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Nitrogen monoxide reacts with oxygen according to the following reaction: 2NO(g)+ O2(g)→ 2NO2(g)If 10 moles of nitrogen monoxide are combined with 4 moles of oxygen, how many moles of NO2 should form?

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s)+ 3Cl2(g)→ 2FeCl3(s)If 35.0 g each of iron and chlorine are combined, how much FeCl3 should form?

If 75.0 J of heat energy is added to 25.0 g samples of different metals. Given their specific heat values, rank the metals in order from least to greatest final temperature.

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 50.4 g of nitrogen.

When ethanol, C2H5OH, a component in some gasoline mixtures, is burned in air, one molecule of ethanol combines with three oxygen molecules to form two CO2 molecules and three H2O molecules. Select the statement below that is incorrect in regard to this reaction.

Consider the following reaction: 3NO2(g)+ H2O(l)→ 2HNO3(l)+ NO(g)How many moles of the excess reactant remain if 4.00 moles of H2O and 10.00 moles of NO2 are mixed?

The following reaction absorbs 393 kJ of heat for each mole of CO2 that reacts. CO2(g)→ C(s)+ O2(g)This reaction

A can of soda has 1.50 x 102 Calories. Convert this energy to units of joules.

What is the heat change when a 225 g sample of olive oil [Cwater = 1.79 J/(g°C)] is cooled from 95.8°C to 52.1°C?

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s)+ Cl2(g)→ 2NaCl(s)If 12.5 g of sodium react with sufficient chlorine, how many grams of sodium chloride should form?

One calorie is the amount of heat energy required to raise the temperature of 10.0 g of water by 1°C.

What is the heat change when a 26.8 g sample of water [Cwater = 4.184 J/(g°C)] is cooled from 75.6°C to 22.1°C?

How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron [C = 0.448 J/(g°C)] from 22.0°C to 100.0°C?

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

The following reaction releases 2800 kJ of heat for each mole of C₆H₁₂O₆ that reacts. C₆H₁₂O₆(s)+ 6O₂(g)→ 6CO₂(g)+ 6H₂O(l)This reaction is

Aluminum reacts with oxygen according to the following reaction: 4Al(s)+ 3O₂(g)→ 2Al₂O₃(s)If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al₂O₃ should form?

When potassium carbonate, K₂CO₃, dissolves in water, the ions that are formed for each formula unit that dissolves are:

Nitrogen monoxide reacts with oxygen according to the following reaction: 2NO(g)+ O₂(g)→ 2NO₂(g)If 10 moles of nitrogen monoxide are combined with 4 moles of oxygen, how many moles of NO₂ should form?

Iron metal reacts with chlorine gas according to the following equation: 2Fe(s)+ 3Cl₂(g)→ 2FeCl₃(s)If 35.0 g each of iron and chlorine are combined, how much FeCl₃ should form?

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 50.4 g of nitrogen.

When ethanol, C₂H₅OH, a component in some gasoline mixtures, is burned in air, one molecule of ethanol combines with three oxygen molecules to form two CO₂ molecules and three H₂O molecules. Select the statement below that is incorrect in regard to this reaction.

Consider the following reaction: 3NO₂(g)+ H₂O(l)→ 2HNO₃(l)+ NO(g)How many moles of the excess reactant remain if 4.00 moles of H₂O and 10.00 moles of NO₂ are mixed?

The following reaction absorbs 393 kJ of heat for each mole of CO₂ that reacts. CO₂(g)→ C(s)+ O₂(g)This reaction

A can of soda has 1.50 x 10² Calories. Convert this energy to units of joules.

What is the heat change when a 225 g sample of olive oil [C_water = 1.79 J/(g°C)] is cooled from 95.8°C to 52.1°C?

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s)+ Cl₂(g)→ 2NaCl(s)If 12.5 g of sodium react with sufficient chlorine, how many grams of sodium chloride should form?

What is the heat change when a 26.8 g sample of water [C_water = 4.184 J/(g°C)] is cooled from 75.6°C to 22.1°C?