1. Chapter 12 Review
Chemical Reactions

2. Name 4 ways to know a chemical reaction is occurring.

3. 1. Precipitate formed 2. Color/Odor change 3
1. Precipitate formed 2. Color/Odor change 3. Energy change (temperature change, light produced) 4. Gas produced *Remember – these aren’t guarantees that a chemical change occurred, just a sign that it might have. Think about whether or not a new substance was created. If so, then a chemical change occurred.

4. How many total atoms are in NO2?

5. 3

6. How many hydrogen atoms are in NH4OH?

7. 5

8. How many oxygen atoms are in Mg3(PO4)2?

9. 8

10. Using the ions given, write the formula for the ionic compound
Using the ions given, write the formula for the ionic compound. Li+, Cl-

11. LiCl

12. Using the ions given, write the formula for the ionic compound
Using the ions given, write the formula for the ionic compound. Ba2+, F-

13. BaF2

14. Write the name of the following compound. CaS

15. Calcium sulfide

16. Write the name of the following compound. SO2

17. (mono)sulfur dioxide

18. Write the name of the following compound. N2O

19. Dinitrogen monoxide

20. Write the name of the following compound. Al2O3

21. Aluminum oxide

22. Write the name of the following compound. HF

23. Hydrofluoric Acid

24. Write the formula for the following compound. Potassium oxide

25. K2O

26. Write the formulas for the following compounds. carbon tetrachloride

27. CCl4

28. Write the formula for the following compound. Silicon dioxide

29. SiO2

30. Write the formulas for the following compound. Calcium nitride

31. Ca3N2

32. Write the formulas for the following compound. Sodium oxide

33. Na2O

34. In order for a reaction to occur, bonds must…? (Break or Form)

35. BREAK

36. Balance the following equation
Balance the following equation. Then, classify what type of reaction it is – combustion, synthesis, decomposition, single replacement, or double replacement.   Li2O  Li + O2   Classification: ___________________________________

37. 2Li2O  4Li + O2 Classification: Decomposition

38. Balance the following equation
Balance the following equation. Then, classify what type of reaction it is – combustion, synthesis, decomposition, single replacement, or double replacement.   Mg + O2  MgO   Classification: ___________________________________

39. 2Mg + O2  2MgO Classification: Synthesis

40. Balance the following equation
Balance the following equation. Then, classify what type of reaction it is – combustion, synthesis, decomposition, single replacement, or double replacement.   CH4 + O2 H2O+ CO2   Classification: _______________________________

41. CH4 + 2O2 2H2O+ CO2 Classification: Combustion

42. Balance the following equation
Balance the following equation. Then, classify what type of reaction it is – combustion, synthesis, decomposition, single replacement, or double replacement.   Ca(OH)2 + HCl  H2O + CaCl2   Classification: _______________________________

43. Ca(OH)2 + 2HCl  2H2O + CaCl2 Classification: Double Replacement

44. Balance the following equation
Balance the following equation. Then, classify what type of reaction it is – combustion, synthesis, decomposition, single replacement, or double replacement.   KI + Br2  I2 + KBr   Classification: _______________________________

45. 2KI + Br2  I2 + 2KBr Classification: Single Replacement

46. Name 2 ways you could slow down a chemical reaction.

47. 1. Lower the temperature 2. Use an inhibitor 3
1. Lower the temperature 2. Use an inhibitor 3. Decrease the surface area 4. Decrease the concentration

48. Look at the graph below and answer the questions that follow.
Would this feel hot or cold to the touch?
Is this endothermic or exothermic?
Is energy absorbed or released?

49. a) Hot b) Exothermic c) Released

50. Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g)
What does the “s” stand for?
What are the reactants?
What does the “aq” stand for?
What does the arrow mean?
e)What do you call the 2 on the H2?

51. What does the “s” stand for? SOLID
What are the reactants? Mg and HCl
What does the “aq” stand for? AQUEOUS
d)What does the arrow mean? YIELDS/PRODUCES e)What do you call the 2 on the H2? SUBSCRIPT

52. This substance speeds up a chemical reaction

53. Catalyst

54. Energy is released in what type of reaction – exothermic or endothermic?

55. Exothermic

56. When an endothermic reaction takes places will the container it is in feel hot or cold?

57. COLD

58. The energy needed to start a chemical reaction

59. Activation Energy

60. Mass is neither created nor destroyed in an ordinary chemical reaction
Mass is neither created nor destroyed in an ordinary chemical reaction. This is which law?

61. Law of Conservation of Mass

62. A substance that slows down or prevents a reaction from occurring

63. Inhibitor

64. Name 2 ways you could speed up a chemical reaction.

65. 1. Increase the temperature 2. Use a catalyst 3
1. Increase the temperature 2. Use a catalyst 3. Increase the surface area 4. Increase the concentration