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

Which of the following is evidence that a chemical reaction has occurred?. 7.1. Formation of a precipitate Color change Emission of light Evolution of gas All of the above. Which of the following is evidence that a chemical reaction has occurred?. 7.1. Formation of a precipitate

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

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  1. Which of the following is evidence that a chemical reaction has occurred? 7.1 Formation of a precipitate Color change Emission of light Evolution of gas All of the above

  2. Which of the following is evidence that a chemical reaction has occurred? 7.1 Formation of a precipitate Color change Emission of light Evolution of gas All of the above

  3. Which of the following is NOT an example of a chemical reaction? 7.2 Digesting a candy bar Burning propane in a gas stove Grinding coffee beans Baking a cake Tarnishing of silverware

  4. Which of the following is NOT an example of a chemical reaction? 7.2 Digesting a candy bar Burning propane in a gas stove Grinding coffee beans Baking a cake Tarnishing of silverware

  5. Which of the following statements is correct about chemical reactions? 7.3 Changing the subscripts to balance an equation is acceptable. The products are listed on the left and the reactants are listed on the right. Atoms are conserved when balancing a chemical equation. Coefficients can be fractions. Subscripts can be fractions.

  6. Which of the following statements is correct about chemical reactions? 7.3 Changing the subscripts to balance an equation is acceptable. The products are listed on the left and the reactants are listed on the right. Atoms are conserved when balancing a chemical equation. Coefficients can be fractions. Subscripts can be fractions.

  7. What is the coefficient for aluminum after the following equation is balanced:Al(s) + O2(g) → Al2O3(s)? 7.4 1 4 3 2 0

  8. What is the coefficient for aluminum after the following equation is balanced:Al(s) + O2(g) → Al2O3(s)? 7.4 1 4 3 2 0

  9. What is the sum of the coefficients after the following equation is balanced:Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)? 7.5 4 6 12 8 10

  10. What is the sum of the coefficients after the following equation is balanced:Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)? 7.5 4 6 12 8 10

  11. When the equation, C5H10(g) + O2(g) → CO2(g) + H2O(g),is balanced, the ratio of oxygen molecules to water molecules is: 7.6 0.66 1.0 1.66 1.5 2.5

  12. When the equation, C5H10(g) + O2(g) → CO2(g) + H2O(g),is balanced, the ratio of oxygen molecules to water molecules is: 7.6 0.66 1.0 1.66 1.5 2.5

  13. Which of the following compounds is a strong electrolyte? 7.7 PbCl2 CaSO4 NaNO3 Al(OH)3 All of the above

  14. Which of the following compounds is a strong electrolyte? 7.7 PbCl2 CaSO4 NaNO3 Al(OH)3 All of the above

  15. Which of the following compounds is INSOLUBLE in water? 7.8 Li2SO4 KOH CaCO3 NH4NO3 NaCl

  16. Which of the following compounds is INSOLUBLE in water? 7.8 Li2SO4 KOH CaCO3 NH4NO3 NaCl

  17. A substance dissolved in water that CANNOT conduct an electric current very efficiently is called a: 7.9 Electrical compound Strong electrolyte Weak electrolyte Weak cation Strong anion

  18. A substance dissolved in water that CANNOT conduct an electric current very efficiently is called a: 7.9 Electrical compound Strong electrolyte Weak electrolyte Weak cation Strong anion

  19. The ions that do not directly form the precipitate during a precipitation reaction are: 7.10 Left to form another precipitate Only anions Only cations Removed from the solution Left dissolved in the solution

  20. The ions that do not directly form the precipitate during a precipitation reaction are: 7.10 Left to form another precipitate Only anions Only cations Removed from the solution Left dissolved in the solution

  21. Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride. 7.11 CaNO3 AgCl Ca(NO3)2 2AgCl None of the above

  22. Identify the solid product formed from the balanced reaction of silver nitrate and calcium chloride. 7.11 CaNO3 AgCl Ca(NO3)2 2AgCl None of the above

  23. Identify the solid product formed from the balanced reaction of potassium nitrate and barium chloride. 7.12 KCl BaNO3 2KCl Ba(NO3)2 None of the above

  24. Identify the solid product formed from the balanced reaction of potassium nitrate and barium chloride. 7.12 KCl BaNO3 2KCl Ba(NO3)2 None of the above

  25. When the following equation: BaCl2(aq) + Na2SO4(aq) →is completed and balanced, a term in the molecular equation is: 7.13 BaSO4(s) NaCl(aq) BaSO4(aq) 2NaCl(s) SO3(g)

  26. When the following equation: BaCl2(aq) + Na2SO4(aq) →is completed and balanced, a term in the molecular equation is: 7.13 BaSO4(s) NaCl(aq) BaSO4(aq) 2NaCl(s) SO3(g)

  27. When the following equation: LiCl(aq) + (NH4)2SO4(aq) →is completed and balanced, a term in the complete ionic equation is: 7.14 LiSO4 2NH4Cl 2SO42- Cl1- 2Li1+

  28. When the following equation: LiCl(aq) + (NH4)2SO4(aq) →is completed and balanced, a term in the complete ionic equation is: 7.14 LiSO4 2NH4Cl 2SO42- Cl1- 2Li1+

  29. When the following equation: KI(aq) + Pb(NO3)2(aq) →is completed and balanced, a term in the net ionic equation is: 7.15 I1- 2K1+ Pb2+ 2NO31- PbI

  30. When the following equation: KI(aq) + Pb(NO3)2(aq) →is completed and balanced, a term in the net ionic equation is: 7.15 I1- 2K1+ Pb2+ 2NO31- PbI

  31. When the following equation: LiOH(aq) + HNO3(aq) →is completed and balanced, the spectator ions are: 7.16 Li1+ and H1+ Li1+ and NO31- Li1+ and OH1- H1+ and OH1- All of the above

  32. When the following equation: LiOH(aq) + HNO3(aq) →is completed and balanced, the spectator ions are: 7.16 Li1+ and H1+ Li1+ and NO31- Li1+ and OH1- H1+ and OH1- All of the above

  33. Which of the following is a nonelectrolyte in an aqueous solution? 7.17 HCl NaCl Al(NO3)3 C6H12O6 NH4Cl

  34. Which of the following is a nonelectrolyte in an aqueous solution? 7.17 HCl NaCl Al(NO3)3 C6H12O6 NH4Cl

  35. What salt is formed from the neutralization reaction between perchloric acid and potassium hydroxide? 7.18 Water Sodium chloride Potassium perchlorate Potassium hydride Potassium chlorate

  36. What salt is formed from the neutralization reaction between perchloric acid and potassium hydroxide? 7.18 Water Sodium chloride Potassium perchlorate Potassium hydride Potassium chlorate

  37. When an acid reacts with a base, what product is typically formed? 7.19 Water Sodium chloride Oxygen Carbon dioxide Ammonium chloride

  38. When an acid reacts with a base, what product is typically formed? 7.19 Water Sodium chloride Oxygen Carbon dioxide Ammonium chloride

  39. Which gas is released from the reaction of calcium carbonate with nitric acid? 7.20 Ammonia Nitrogen dioxide Hydrogen Carbon dioxide Nitrogen

  40. Which gas is released from the reaction of calcium carbonate with nitric acid? 7.20 Ammonia Nitrogen dioxide Hydrogen Carbon dioxide Nitrogen

  41. How many molecules of carbon dioxide are produced from the combustion of one molecule of propane (C3H8)? 7.21 6 3 1 5 4

  42. How many molecules of carbon dioxide are produced from the combustion of one molecule of propane (C3H8)? 7.21 6 3 1 5 4

  43. What type of reaction occurs between Ba(NO3)2 and K2CrO4? 7.22 Precipitation Acid–base Oxidation–reduction Double displacement Two of the above

  44. What type of reaction occurs between Ba(NO3)2 and K2CrO4? 7.22 Precipitation Acid—base Oxidation—reduction Double displacement Two of the above

  45. What type of reaction is: HgO(s) → Hg(l) + O2(g)? 7.23 Synthesis/combination Decomposition Displacement Double-displacement Two of the above

  46. What type of reaction is: HgO(s) → Hg(l) + O2(g)? 7.23 Synthesis/combination Decomposition Displacement Double-displacement Two of the above

  47. What type of reaction is: 4Fe(s) + O2(g) → 2Fe2O3(s)? 7.24 Oxidation–reduction Combustion Synthesis/combination All of the above Two of the above

  48. What type of reaction is:4Fe(s) + O2(g) → 2Fe2O3(s)? 7.24 Oxidation–reduction Combustion Synthesis/combination All of the above Two of the above

  49. What type of reaction is: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)? 7.25 Precipitation Acid–base Double-displacement Single-displacement Two of the above

  50. What type of reaction is: Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)? 7.25 Precipitation Acid–base Double-displacement Single-displacement Two of the above

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