which of the following is evidence that a chemical reaction has occurred?

Tro IC3

1. Formation of a precipitate2. Color change3. Emission of light4. Evolution of gas5. All of the above

7.1 Which of the following is evidence that a chemical reaction has occurred?

Tro IC3

1. Formation of a precipitate2. Color change3. Emission of light4. Evolution of gas5. All of the above

7.1 Which of the following is evidence that a chemical reaction has occurred?

Tro IC3

1. Digesting a candy bar2. Burning propane in a gas stove3. Grinding coffee beans4. Baking a cake5. Tarnishing of silverware

7.2 Which of the following is NOT an example of a chemical reaction?

Tro IC3

1. Digesting a candy bar2. Burning propane in a gas stove3. Grinding coffee beans4. Baking a cake5. Tarnishing of silverware

7.2 Which of the following is NOT an example of a chemical reaction?

Tro IC3

1. Changing the subscripts to balance an equation is acceptable.2. The products are listed on the left and the reactants are listed

on the right.3. Atoms are conserved when balancing a chemical equation.4. Coefficients can be fractions.5. Subscripts can be fractions.

7.3 Which of the following statements is correct about chemical reactions?

Tro IC3

1. Changing the subscripts to balance an equation is acceptable.2. The products are listed on the left and the reactants are listed

on the right.3. Atoms are conserved when balancing a chemical equation.4. Coefficients can be fractions.5. Subscripts can be fractions.

7.3 Which of the following statements is correct about chemical reactions?

Tro IC3

1. 12. 43. 34. 25. 0

7.4 What is the coefficient for aluminum after the following equation is balanced:Al(s) + O2(g) → Al2O3(s)?

Tro IC3

1. 12. 43. 34. 25. 0

7.4 What is the coefficient for aluminum after the following equation is balanced:Al(s) + O2(g) → Al2O3(s)?

Tro IC3

1. 42. 63. 124. 85. 10

7.5 What is the sum of the coefficients after the following equation is balanced:Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)?

Tro IC3

1. 42. 63. 124. 85. 10

7.5 What is the sum of the coefficients after the following equation is balanced:Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)?

Tro IC3

1. 0.662. 1.03. 1.664. 1.55. 2.5

7.6 When the equation, C5H10(g) + O2(g) → CO2(g) + H2O(g), is balanced, the ratio of oxygen molecules to water molecules is:

Tro IC3

1. 0.662. 1.03. 1.664. 1.55. 2.5

7.6 When the equation, C5H10(g) + O2(g) → CO2(g) + H2O(g), is balanced, the ratio of oxygen molecules to water molecules is:

Tro IC3

1. PbCl22. CaSO4

3. NaNO3

4. Al(OH)3

5. All of the above

7.7 Which of the following compounds is a strong electrolyte?

Tro IC3

1. PbCl22. CaSO4

3. NaNO3

4. Al(OH)3

5. All of the above

7.7 Which of the following compounds is a strong electrolyte?

Tro IC3

1. Li2SO4

2. KOH3. CaCO3

4. NH4NO3

5. NaCl

7.8 Which of the following compounds is INSOLUBLE in water?

Tro IC3

1. Li2SO4

2. KOH3. CaCO3

4. NH4NO3

5. NaCl

7.8 Which of the following compounds is INSOLUBLE in water?

Tro IC3

1. Electrical compound2. Strong electrolyte3. Weak electrolyte4. Weak cation5. Strong anion

7.9 A substance dissolved in water that CANNOT conduct an electric current very efficiently is called a:

Tro IC3

1. Electrical compound2. Strong electrolyte3. Weak electrolyte4. Weak cation5. Strong anion

7.9 A substance dissolved in water that CANNOT conduct an electric current very efficiently is called a:

Tro IC3

1. Left to form another precipitate2. Only anions3. Only cations4. Removed from the solution5. Left dissolved in the solution

7.10 The ions that do not directly form the precipitate during a precipitation reaction are:

Tro IC3

1. Left to form another precipitate2. Only anions3. Only cations4. Removed from the solution5. Left dissolved in the solution

7.10 The ions that do not directly form the precipitate during a precipitation reaction are:

Tro IC3

1. CaNO3

2. AgCl3. Ca(NO3)2

4. 2AgCl5. None of the above

7.11 Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride.

Tro IC3

1. CaNO3

2. AgCl3. Ca(NO3)2

4. 2AgCl5. None of the above

7.11 Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride.

Tro IC3

1. KCl2. BaNO3

3. 2KCl4. Ba(NO3)2

5. None of the above

7.12 Identify the solid product formed from the balanced reaction of potassium nitrate and barium chloride.

Tro IC3

1. KCl2. BaNO3

3. 2KCl4. Ba(NO3)2

5. None of the above

7.12 Identify the solid product formed from the balanced reaction of potassium nitrate and barium chloride.

Tro IC3

1. BaSO4(s)

2. NaCl(aq)3. BaSO4(aq)

4. 2NaCl(s)5. SO3(g)

7.13 When the following equation: BaCl2(aq) + Na2SO4(aq) →is completed and balanced, a term in the molecular equation is:

Tro IC3

1. BaSO4(s)

2. NaCl(aq)3. BaSO4(aq)

4. 2NaCl(s)5. SO3(g)

7.13 When the following equation: BaCl2(aq) + Na2SO4(aq) →is completed and balanced, a term in the molecular equation is:

Tro IC3

1. LiSO4

2. 2NH4Cl

3. 2SO42-

4. Cl1-

5. 2Li1+

7.14 When the following equation: LiCl (aq) + (NH4)2SO4(aq) → is completed and balanced, a term in the complete ionic equation is:

Tro IC3

1. LiSO4

2. 2NH4Cl

3. 2SO42-

4. Cl1-

5. 2Li1+

7.14 When the following equation: LiCl (aq) + (NH4)2SO4(aq) → is completed and balanced, a term in the complete ionic equation is:

Tro IC3

1. I1-

2. 2K1+

3. Pb2+

4. 2NO31-

5. PbI

7.15 When the following equation: KI(aq) + Pb(NO3)2(aq) →is completed and balanced, a term in the net ionic equation is:

Tro IC3

1. I1-

2. 2K1+

3. Pb2+

4. 2NO31-

5. PbI

7.15 When the following equation: KI(aq) + Pb(NO3)2(aq) →is completed and balanced, a term in the net ionic equation is:

Tro IC3

1. Li1+ and H1+ 2. Li1+ and NO3

1-

3. Li1+ and OH1-

4. H1+ and OH1-

5. All of the above

7.16 When the following equation: LiOH(aq) + HNO3(aq) → is completed and balanced, the spectator ions are:

Tro IC3

1. Li1+ and H1+ 2. Li1+ and NO3

1-

3. Li1+ and OH1-

4. H1+ and OH1-

5. All of the above

7.16 When the following equation: LiOH(aq) + HNO3(aq) → is completed and balanced, the spectator ions are:

Tro IC3

1. HCl2. NaCl3. Al(NO3)3

4. C6H12O6

5. NH4Cl

7.17 Which of the following is a nonelectrolyte in an aqueous solution?

Tro IC3

1. HCl2. NaCl3. Al(NO3)3

4. C6H12O6

5. NH4Cl

7.17 Which of the following is a nonelectrolyte in an aqueous solution?

Tro IC3

1. Water2. Sodium chloride3. Potassium perchlorate4. Potassium hydride5. Potassium chlorate

7.18 What salt is formed from the neutralization reaction between perchloric acid and potassium hydroxide?

Tro IC3

1. Water2. Sodium chloride3. Potassium perchlorate4. Potassium hydride5. Potassium chlorate

7.18 What salt is formed from the neutralization reaction between perchloric acid and potassium hydroxide?

Tro IC3

1. Water2. Sodium chloride3. Oxygen4. Carbon dioxide5. Ammonium chloride

7.19 When an acid reacts with a base, what product is typically formed?

Tro IC3

1. Water2. Sodium chloride3. Oxygen4. Carbon dioxide5. Ammonium chloride

7.19 When an acid reacts with a base, what product is typically formed?

Tro IC3

1. Ammonia2. Nitrogen dioxide3. Hydrogen4. Carbon dioxide5. Nitrogen

7.20 Which gas is released from the reaction of calcium carbonate with nitric acid?

Tro IC3

1. Ammonia2. Nitrogen dioxide3. Hydrogen4. Carbon dioxide5. Nitrogen

7.20 Which gas is released from the reaction of calcium carbonate with nitric acid?

Tro IC3

1. 62. 33. 14. 55. 4

7.21 How many molecules of carbon dioxide are produced from the combustion of one molecule of propane (C3H8)?

Tro IC3

1. 62. 33. 14. 55. 4

7.21 How many molecules of carbon dioxide are produced from the combustion of one molecule of propane (C3H8)?

Tro IC3

1. Precipitation2. Acid–base3. Oxidation–reduction4. Double displacement5. Two of the above

7.22 What type of reaction occurs between Ba(NO3)2 and K2CrO4?

Tro IC3

1. Precipitation2. Acid—base3. Oxidation—reduction4. Double displacement5. Two of the above

7.22 What type of reaction occurs between Ba(NO3)2 and K2CrO4?

Tro IC3

1. Synthesis/combination2. Decomposition3. Displacement4. Double-displacement5. Two of the above

7.23 What type of reaction is: HgO (s) → Hg(l) + O2(g)?

Tro IC3

1. Synthesis/combination2. Decomposition3. Displacement4. Double-displacement5. Two of the above

7.23 What type of reaction is: HgO (s) → Hg(l) + O2(g)?

Tro IC3

1. Oxidation–reduction2. Combustion3. Synthesis/combination4. All of the above5. Two of the above

7.24 What type of reaction is: 4Fe(s) + O2(g) → 2Fe2O3(s)?

Tro IC3

1. Oxidation–reduction2. Combustion3. Synthesis/combination4. All of the above5. Two of the above

7.24 What type of reaction is:4Fe(s) + O2(g) → 2Fe2O3(s)?

Tro IC3

1. Precipitation2. Acid–base3. Double-displacement4. Single-displacement5. Two of the above

7.25 What type of reaction is: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)?

Tro IC3

1. Precipitation2. Acid–base3. Double-displacement4. Single-displacement5. Two of the above

7.25 What type of reaction is: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)?