Question 1

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

Question 2

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) $\rightarrow$  2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride should form?

Accepted Answer

A) 1.1 x 102 g 
B) 2.1 x 102 g 
C) 4.2 x 102 g 
D) 0.13 g 
E) 0.062 g 
A) 1.1 x 102 g 
B) 2.1 x 102 g 
C) 4.2 x 102 g 
D) 0.13 g 
E) 0.062 g

Question 3

Aluminum reacts with oxygen according to the following reaction: 4Al(s) + 3O2(g) $\rightarrow$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 4

How much heat energy would be needed to raise the temperature of a 22.3 g sample of aluminum [(C = 0.895 (J/g $\degree$C)] from 22.5 $\degree$C to 55.0 $\degree$C?

Accepted Answer

A) 20.0 J 
B) 649 J 
C) 725 J 
D) 8.10 x 102 J 
E) not enough information given 
A) 20.0 J 
B) 649 J 
C) 725 J 
D) 8.10 x 102 J 
E) not enough information given

Question 5

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 
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

Question 6

Equal masses of ice at 0 $\degree$C and water at 100 $\degree$C are mixed in an insulated container.Estimate the final temperature of the mixture.

Accepted Answer

A) between 51 and 99 $\degree$C 
B) between 1 and 49 $\degree$C 
C) 50 $\degree$C 
D) 0 $\degree$C 
E) 100 $\degree$C 
A) between 51 and 99 $\degree$C 
B) between 1 and 49 $\degree$C 
C) 50 $\degree$C 
D) 0 $\degree$C 
E) 100 $\degree$C

Question 7

Consider the following reaction: 3NO2(g) + H2O(l) $\rightarrow$ 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 8

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) $\rightarrow$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 9

Which of the following best describes an exothermic reaction?

Accepted Answer

A) Heat must be added to get the reaction to go 
B) The temperature of the surroundings decreases 
C) The potential energy of the reactants is greater than that of the surroundings 
D) Matter is converted into energy 
E) Heat is absorbed by the reaction from the surroundings 
A) Heat must be added to get the reaction to go 
B) The temperature of the surroundings decreases 
C) The potential energy of the reactants is greater than that of the surroundings 
D) Matter is converted into energy 
E) Heat is absorbed by the reaction from the surroundings

Question 10

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 11

When phosphorus reacts with chlorine, phosphorus trichloride is formed according to the equation: ___P4(s) + ___Cl2(g)$\rightarrow$___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

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 13

When a 0.525 g piece of zinc is placed in a solution of copper(II) sulfate, copper metal and zinc sulfate are formed.Balance the equation for the reaction, and determine the mass of copper(II) sulfate that would react with this quantity of zinc. ___ Zn(s) + ___CuSO4(aq) $\rightarrow$ ___ZnSO4(aq) + ___Cu(s) (unbalanced)

Accepted Answer

A) 65.4 g 
B) 0.641 g 
C) 1.28 g 
D) 2.56 g 
E) 159 g 
A) 65.4 g 
B) 0.641 g 
C) 1.28 g 
D) 2.56 g 
E) 159 g

Question 14

The figure shows a molecular-level diagram of reactant molecules for the reaction 2H2(g) + O2(g) $\rightarrow$  2H2O(l)   List the number and formulas of the molecules that should be present after the reaction takes place.

Accepted Answer

A) 2H2O + 6H2 + 2O2  
B) 3H2O + 5H2 + O2  
C) 4H2O + 4H2 + O2  
D) 6H2O + 2H2 + O2  
E) 6H2O + 2H2  
A) 2H2O + 6H2 + 2O2  
B) 3H2O + 5H2 + O2  
C) 4H2O + 4H2 + O2  
D) 6H2O + 2H2 + O2  
E) 6H2O + 2H2

Question 15

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 16

Phosphine, PH3, a reactive and poisonous compound, reacts with oxygen as follows: 4PH3(g) + 8O2(g) $\rightarrow$P4O10(s) + 6H2O(g) If you need to make 6.5 moles of P4O10 , how many moles of PH3 is required for the reaction?

Accepted Answer

A) 6.5 moles 
B) 13 moles 
C) 26 moles 
D) 3.2 moles 
E) 1.6 moles 
A) 6.5 moles 
B) 13 moles 
C) 26 moles 
D) 3.2 moles 
E) 1.6 moles

Question 17

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 25 molecules of nitrogen are mixed with 60 molecules of hydrogen?

Accepted Answer

A) 20 molecules 
B) 25 molecules 
C) 30 molecules 
D) 40 molecules 
E) 85 molecules 
A) 20 molecules 
B) 25 molecules 
C) 30 molecules 
D) 40 molecules 
E) 85 molecules

Question 18

When mercury(II) oxide, a red crystalline solid, is heated, it decomposes to form liquid mercury and oxygen gas, according to the following equation: ___HgO(s) $\rightarrow$___Hg(l) + ___O2(g)  (unbalanced) Balance the equation and determine the mass of mercury that should be formed when 12.3 g of HgO is heated.

Accepted Answer

A) 22.8 g 
B) 11.4 g 
C) 5.70 g 
D) 13.3 g 
E) 6.64 g 
A) 22.8 g 
B) 11.4 g 
C) 5.70 g 
D) 13.3 g 
E) 6.64 g

Question 19

Given that 4NH3(g) + 5O2(g) $\rightarrow$ 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 20

A carton of low-fat yogurt says it has 1.70 x 102 Calories.What is the equivalent amount of energy in units of joules?

Accepted Answer

A) 711 J 
B) 7.11 x 105 J 
C) 4.06 x 104 J 
D) 406 J 
E) 40.6 J 
A) 711 J 
B) 7.11 x 105 J 
C) 4.06 x 104 J 
D) 406 J 
E) 40.6 J

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

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl₂(g) $\rightarrow$ 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride should form?

Aluminum reacts with oxygen according to the following reaction: 4Al(s) + 3O₂(g) $\rightarrow$ 2Al₂O₃(s) If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al₂O₃should form?

How much heat energy would be needed to raise the temperature of a 22.3 g sample of aluminum [(C = 0.895 (J/g $\degree$ C)] from 22.5 $\degree$ C to 55.0 $\degree$ C?

Which of the following is an exothermic process?

Equal masses of ice at 0 $\degree$ C and water at 100 $\degree$ C are mixed in an insulated container.Estimate the final temperature of the mixture.

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

Which of the following best describes an exothermic reaction?

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

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.

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?

Phosphine, PH₃, a reactive and poisonous compound, reacts with oxygen as follows: 4PH₃(g) + 8O₂(g) $\rightarrow$ P₄O₁₀(s) + 6H₂O(g) If you need to make 6.5 moles of P₄O₁₀, how many moles of PH₃is required for the reaction?

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 25 molecules of nitrogen are mixed with 60 molecules of hydrogen?

Given that 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 6.3 moles of NH₃react with sufficient oxygen, how many moles of NO should form?

A carton of low-fat yogurt says it has 1.70 x 10²Calories.What is the equivalent amount of energy in units of joules?

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

Exam 6: Quantities in Chemical Reactions

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

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) →\rightarrow→ 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride should form?

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

How much heat energy would be needed to raise the temperature of a 22.3 g sample of aluminum [(C = 0.895 (J/g °\degree° C)] from 22.5 °\degree° C to 55.0 °\degree° C?

Which of the following is an exothermic process?

Equal masses of ice at 0 °\degree° C and water at 100 °\degree° C are mixed in an insulated container.Estimate the final temperature of the mixture.

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

Which of the following best describes an exothermic reaction?

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

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.

The figure shows a molecular-level diagram of reactant molecules for the reaction 2H2(g) + O2(g) →\rightarrow→ 2H2O(l) List the number and formulas of the molecules that should be present after the reaction takes place.

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?

Phosphine, PH3, a reactive and poisonous compound, reacts with oxygen as follows: 4PH3(g) + 8O2(g) →\rightarrow→ P4O10(s) + 6H2O(g) If you need to make 6.5 moles of P4O10 , how many moles of PH3 is required for the reaction?

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 25 molecules of nitrogen are mixed with 60 molecules of hydrogen?

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

A carton of low-fat yogurt says it has 1.70 x 102 Calories.What is the equivalent amount of energy in units of joules?

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

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

Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl₂(g) $\rightarrow$ 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride should form?

Aluminum reacts with oxygen according to the following reaction: 4Al(s) + 3O₂(g) $\rightarrow$ 2Al₂O₃(s) If 12 moles of aluminum are combined with 6 moles of oxygen, how many moles of Al₂O₃should form?

How much heat energy would be needed to raise the temperature of a 22.3 g sample of aluminum [(C = 0.895 (J/g $\degree$ C)] from 22.5 $\degree$ C to 55.0 $\degree$ C?

Equal masses of ice at 0 $\degree$ C and water at 100 $\degree$ C are mixed in an insulated container.Estimate the final temperature of the mixture.

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

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

Phosphine, PH₃, a reactive and poisonous compound, reacts with oxygen as follows: 4PH₃(g) + 8O₂(g) $\rightarrow$ P₄O₁₀(s) + 6H₂O(g) If you need to make 6.5 moles of P₄O₁₀, how many moles of PH₃is required for the reaction?

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 25 molecules of nitrogen are mixed with 60 molecules of hydrogen?

Given that 4NH₃(g) + 5O₂(g) $\rightarrow$ 4NO(g) + 6H₂O(g), if 6.3 moles of NH₃react with sufficient oxygen, how many moles of NO should form?

A carton of low-fat yogurt says it has 1.70 x 10²Calories.What is the equivalent amount of energy in units of joules?