Question 1

Which of the following processes is exothermic?

Accepted Answer

A) ice melting in a beverage 
B) dry ice (solid CO2) converting to a gas at room temperature 
C) evaporation of water from a mud puddle 
D) burning propane in a barbeque grill 
E) wax melting on the top of a burning candle 
A) ice melting in a beverage 
B) dry ice (solid CO2) converting to a gas at room temperature 
C) evaporation of water from a mud puddle 
D) burning propane in a barbeque grill 
E) wax melting on the top of a burning candle

Question 2

Given the balanced equation 4NH3(g) + 5O2(g) $\rightarrow$ 4NO(g) + 6H2O(g), if 82.0 g of NH3 react with sufficient oxygen, how many grams of NO should form?

Accepted Answer

A) 145 g 
B) 5.80 x 102 g 
C) 46.5 g 
D) 186 g 
E) 11.6 g 
A) 145 g 
B) 5.80 x 102 g 
C) 46.5 g 
D) 186 g 
E) 11.6 g

Question 3

What is the heat change when a 53.5 g sample of water [Cwater = 4.184 J/(g $\degree$C)] is cooled from 98.0 $\degree$C to 23.2 $\degree$C?

Accepted Answer

A) 1.67 x 104 J 
B) -1.67 x 104 J 
C) 2.19 x 104 J 
D) -956 J 
E) not enough information given 
A) 1.67 x 104 J 
B) -1.67 x 104 J 
C) 2.19 x 104 J 
D) -956 J 
E) not enough information given

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

Question 5

Ammonia is usually made by the following reaction: N2(g) + 3H2(g)$\rightarrow$2NH3(g) What is the maximum amount of ammonia that can be formed if 30 molecules of nitrogen are mixed with 100 molecules of hydrogen?

Accepted Answer

A) 20 molecules 
B) 30 molecules 
C) 40 molecules 
D) 60 molecules 
E) 70 molecules 
A) 20 molecules 
B) 30 molecules 
C) 40 molecules 
D) 60 molecules 
E) 70 molecules

Question 6

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) $\rightarrow$ ____KCl(s) + ___O2(g)   (unbalanced) Balance the equation, and determine the mass of oxygen that should be formed if 10.0 g of potassium chlorate decomposes.

Accepted Answer

A) 7.83 g 
B) 115 g 
C) 3.92 g 
D) 38.3 g 
E) 57.4 g 
A) 7.83 g 
B) 115 g 
C) 3.92 g 
D) 38.3 g 
E) 57.4 g

Question 7

Given that 4NH3(g) + 5O2(g) $\rightarrow$ 4NO(g) + 6H2O(g), if 8.2 moles of NH3 react with sufficient oxygen, how many moles of water should form?

Accepted Answer

A) 6.0 moles 
B) 4.0 moles 
C) 5.0 moles 
D) 12 moles 
E) 8.2 moles 
A) 6.0 moles 
B) 4.0 moles 
C) 5.0 moles 
D) 12 moles 
E) 8.2 moles

Question 8

Consider the following reaction: 3NO2(g) + H2O(l) $\rightarrow$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 9

The following reaction releases 2800 kJ of heat for each mole of C6H12O6 that reacts. C6H12O6(s) + 6O2(g) $\rightarrow$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 10

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

Accepted Answer

A) True 
 B)False

Question 11

Phosphorus trichloride can be made by the following reaction: P4(s) + 6Cl2(g) $\rightarrow$4PCl3(l) What is the maximum amount of phosphorus trichloride that can be formed if 10 molecules of P4 are mixed with 36 molecules of chlorine?

Accepted Answer

A) 4 molecules 
B) 6 molecules 
C) 12 molecules 
D) 24 molecules 
E) 46 molecules 
A) 4 molecules 
B) 6 molecules 
C) 12 molecules 
D) 24 molecules 
E) 46 molecules

Question 12

How much heat energy would be needed to raise the temperature of a 32.0 g sample of gold [C = 0.129 (J/g $\degree$C)] from 21.8 $\degree$C to 75.0 $\degree$C?

Accepted Answer

A) 3.10 x 102 J 
B) 1.32 x 104 J 
C) 2.20 x 102 J 
D) 90.0 J 
E) not enough information given 
A) 3.10 x 102 J 
B) 1.32 x 104 J 
C) 2.20 x 102 J 
D) 90.0 J 
E) not enough information given

Question 13

When 5.0 g CaCl2 is dissolved in enough water to make a 0.500 L solution, what is the molarity of ions in solution?

Accepted Answer

A) 0.135 M 
B) 0.045 M 
C) 0.270 M 
D) 10.0 M 
E) 2.50 M 
A) 0.135 M 
B) 0.045 M 
C) 0.270 M 
D) 10.0 M 
E) 2.50 M

Question 14

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) 2N2 + 3O2 $\rightarrow$2N2O3  
B) N2 + 2Cl2$\rightarrow$N2Cl4  
C) O2 + 2H2 $\rightarrow$2H2O 
D) N2 + 3Cl2$\rightarrow$2NCl3  
E) 3N2 + 2H2 $\rightarrow$3N2H4  
A) 2N2 + 3O2 $\rightarrow$2N2O3  
B) N2 + 2Cl2$\rightarrow$N2Cl4  
C) O2 + 2H2 $\rightarrow$2H2O 
D) N2 + 3Cl2$\rightarrow$2NCl3  
E) 3N2 + 2H2 $\rightarrow$3N2H4

Question 15

If you have eight bicycle wheels and five frames, how many bikes could you build (assuming that each bike requires one frame and two wheels), and what would be left over?

Accepted Answer

A) Four bikes could be built, and nothing would be left over. 
B) Four bikes could be built, and one frame would be left over. 
C) Five bikes could be built, and three wheels would be left over. 
D) Five bikes could be built, and nothing would be left over. 
E) Three bikes could be built, and two frames would be left over. 
A) Four bikes could be built, and nothing would be left over. 
B) Four bikes could be built, and one frame would be left over. 
C) Five bikes could be built, and three wheels would be left over. 
D) Five bikes could be built, and nothing would be left over. 
E) Three bikes could be built, and two frames would be left over.

Question 16

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 17

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 18

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) $\rightarrow$  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 19

Nitrogen and hydrogen react together to form ammonia according to the following equation: ___N2(g) + ___H2(g)$\rightarrow$___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 20

Which of the following is an exothermic process?

Accepted Answer

A) ice melting 
B) water evaporating 
C) boiling soup 
D) condensation of water vapor 
E) Ammonium thiocyanate and barium hydroxide are mixed, resulting in a decrease in temperature of the surroundings 
A) ice melting 
B) water evaporating 
C) boiling soup 
D) condensation of water vapor 
E) Ammonium thiocyanate and barium hydroxide are mixed, resulting in a decrease in temperature of the surroundings

Which of the following processes is exothermic?

Given the balanced equation 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 82.0 g of NH₃react with sufficient oxygen, how many grams of NO should form?

What is the heat change when a 53.5 g sample of water [C_water = 4.184 J/(g $\degree$ C)] is cooled from 98.0 $\degree$ C to 23.2 $\degree$ C?

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?

Ammonia is usually made by the following reaction: N₂(g) + 3H₂(g) $\rightarrow$ 2NH₃(g) What is the maximum amount of ammonia that can be formed if 30 molecules of nitrogen are mixed with 100 molecules of hydrogen?

Given that 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 8.2 moles of NH₃react with sufficient oxygen, how many moles of water should form?

Consider the following reaction: 3NO₂(g) + H₂O(l) $\rightarrow$ 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?

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

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

Phosphorus trichloride can be made by the following reaction: P₄(s) + 6Cl₂(g) $\rightarrow$ 4PCl₃(l) What is the maximum amount of phosphorus trichloride that can be formed if 10 molecules of P₄ are mixed with 36 molecules of chlorine?

How much heat energy would be needed to raise the temperature of a 32.0 g sample of gold [C = 0.129 (J/g $\degree$ C)] from 21.8 $\degree$ C to 75.0 $\degree$ C?

When 5.0 g CaCl₂ is dissolved in enough water to make a 0.500 L solution, what is the molarity of ions in solution?

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?

If you have eight bicycle wheels and five frames, how many bikes could you build (assuming that each bike requires one frame and two wheels), and what would be left over?

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

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

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

Which of the following is an exothermic process?

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

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Biochemistry

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Exam 6: Quantities in Chemical Reactions

Which of the following processes is exothermic?

Given the balanced equation 4NH3(g) + 5O2(g) →\rightarrow→ 4NO(g) + 6H2O(g), if 82.0 g of NH3 react with sufficient oxygen, how many grams of NO should form?

What is the heat change when a 53.5 g sample of water [Cwater = 4.184 J/(g °\degree° C)] is cooled from 98.0 °\degree° C to 23.2 °\degree° C?

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?

Ammonia is usually made by the following reaction: N2(g) + 3H2(g) →\rightarrow→ 2NH3(g) What is the maximum amount of ammonia that can be formed if 30 molecules of nitrogen are mixed with 100 molecules of hydrogen?

Given that 4NH3(g) + 5O2(g) →\rightarrow→ 4NO(g) + 6H2O(g), if 8.2 moles of NH3 react with sufficient oxygen, how many moles of water should form?

Consider the following reaction: 3NO2(g) + H2O(l) →\rightarrow→ 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?

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

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

Phosphorus trichloride can be made by the following reaction: P4(s) + 6Cl2(g) →\rightarrow→ 4PCl3(l) What is the maximum amount of phosphorus trichloride that can be formed if 10 molecules of P4 are mixed with 36 molecules of chlorine?

How much heat energy would be needed to raise the temperature of a 32.0 g sample of gold [C = 0.129 (J/g °\degree° C)] from 21.8 °\degree° C to 75.0 °\degree° C?

When 5.0 g CaCl2 is dissolved in enough water to make a 0.500 L solution, what is the molarity of ions in solution?

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?

If you have eight bicycle wheels and five frames, how many bikes could you build (assuming that each bike requires one frame and two wheels), and what would be left over?

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

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

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

Which of the following is an exothermic process?

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

Given the balanced equation 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 82.0 g of NH₃react with sufficient oxygen, how many grams of NO should form?

What is the heat change when a 53.5 g sample of water [C_water = 4.184 J/(g $\degree$ C)] is cooled from 98.0 $\degree$ C to 23.2 $\degree$ C?

Ammonia is usually made by the following reaction: N₂(g) + 3H₂(g) $\rightarrow$ 2NH₃(g) What is the maximum amount of ammonia that can be formed if 30 molecules of nitrogen are mixed with 100 molecules of hydrogen?

Given that 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 8.2 moles of NH₃react with sufficient oxygen, how many moles of water should form?

Consider the following reaction: 3NO₂(g) + H₂O(l) $\rightarrow$ 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?

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

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

Phosphorus trichloride can be made by the following reaction: P₄(s) + 6Cl₂(g) $\rightarrow$ 4PCl₃(l) What is the maximum amount of phosphorus trichloride that can be formed if 10 molecules of P₄ are mixed with 36 molecules of chlorine?

How much heat energy would be needed to raise the temperature of a 32.0 g sample of gold [C = 0.129 (J/g $\degree$ C)] from 21.8 $\degree$ C to 75.0 $\degree$ C?

When 5.0 g CaCl₂ is dissolved in enough water to make a 0.500 L solution, what is the molarity of ions in solution?

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

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

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