1. Choose Your Category Potential Energy Graph Reaction Rates K eq and K sp Le Châtelier's Principle Definitions 100 200 300 400 Round Two

2. Potential Energy Graph - 100 Where is the location on the activated complex on this graph? Back The Answer is the top of the hump.

3. Potential Energy Graph - 200 What is the energy of the products? The Answer is 100 J. Back

4. Potential Energy Graph - 300 What is the energy needed to break the chemical bonds? The Answer is 100 J. Back

5. Potential Energy Graph - 400 What is the net energy of this reaction? The answer is -200 J Back

6. Daily Double

7. Reaction Rates - 100 Calcium carbonate was placed in a flask on a balance, and dilute hydrochloric acid was added. Carbon dioxide that was produced escaped from the flask. The total mass of the flask and its contents was recorded every 10 seconds. The diagram to the right shows a plot of the results. Between which two times shown was the reaction the fastest? The Answer is 0-10 seconds. Back

8. Reaction Rates - 200 At equilibrium, the forward reaction rate is _____________ to the reverse reaction rate. The Answer is equal Back

9. Reaction Rates - 300 The role of a catalyst is to affect ________________. The Answer is activation energy. Back

10. Daily Double

11. Reaction Rates - 400 Name three factors that can influence the rate of a reaction. The Answer is any three of the following: concentration of the reactants temperature surface area pressure catalysts Back

12. K eq and K sp – 100 What is k sp for the dissociation of NaCl in water? NaCl (s) + H 2 O (l)  Na + (aq) + Cl - (aq) The Answer is [Na + ][Cl - ] Back

13. K eq and K sp – 200 What is the equilibrium expression (Keq) for the following reaction? CaCO 3 (s) + 2H 3 O + (aq)  Ca 2+ (aq) + CO 2 (g) + 3H 2 O(l) The Answer is K eq =[Ca 2+ ][CO 2 ] [H 3 O + ] 2 Back

14. Random Points 100 Points

15. K eq and K sp – 300 A very low value of the equilibrium constant for a reaction can indicate that A) products are favored B) equilibrium is reached slowly C) Reactants are favored D) equilibrium is reached quickly The Answer is C. Back

16. K eq and K sp – 400 What is the solubility in mol/L of silver iodide, AgI? Its K sp value is 8.3 x 10 -17 and the equation is AgI (s)  Ag +1 (aq) + I -1 (aq). The Answer is 9.11 x 10 -9 Back

17. Le Châtelier's Principle - 100 [Ni(H 2 O) 6 ] +2 + 6NH 3  [Ni(NH 3 ) 6 ] +2 + 6H 2 O (endothermic) greenblue-violet What color would you expect the above solution to be if NH 3 is added? (Green, blue-violet or no change) The Answer is blue-violet Back

18. Le Châtelier's Principle - 200 [Ni(H 2 O) 6 ] +2 + 6NH 3  [Ni(NH 3 ) 6 ] +2 + 6H 2 O (endothermic) greenblue-violet What color would you expect the above solution to be if water is removed? (Green, blue-violet or no change) The Answer is blue-violet. Back

19. Random Points 300 Points

20. [Ni(H 2 O) 6 ] +2 + 6NH 3  [Ni(NH 3 ) 6 ] +2 + 6H 2 O (endothermic) greenblue-violet What color would you expect the above solution to be if NaBr is added? (Green, blue-violet or no change) Le Châtelier's Principle - 300 The Answer is no change. Back

21. The Answer is blue-violet Le Châtelier's Principle - 400 [Ni(H 2 O) 6 ] +2 + 6NH 3  [Ni(NH 3 ) 6 ] +2 + 6H 2 O (endothermic) greenblue-violet What color would you expect the above solution to be if the solution is heated? (Green, blue- violet or no change) Back

22. Definitions – 100 The Answer is reversible reaction. A chemical reaction in which the products re-form the original reactants Back

23. Random Points 500 Points

24. Definitions – 200 A state of balance in which the rate of a forward reaction equals the rate of the reverse reaction and the concentrations of substances do not change The Answer is equilibrium. Back

25. Definitions – 300 A type of protein that speeds up metabolic reactions in plant and animals without being permanently changed or destroyed The Answer is an enzyme. Back

26. Definitions – 400 The minimum amount of energy required to start a chemical reaction. The Answer is activation energy. Back

27. Choose Your Category PropertiesIdentify the Acid or Base pHK w and K a TitrationsDefinitions 100 200 300 400 The Final Question

28. Properties - 100 Acids taste __________________. Back The Answer is sour, or any word that means sour.

29. Properties - 200 If a base was touched, it would feel ____________________. Back The Answer is slippery.

30. Properties - 300 Strong acids are ______________ electrolytes. Back The Answer is strong.

31. Properties - 400 Strong acids ______________ ionize when added to water. Back The Answer is completely.

32. Identify the Acid or Base - 100 Whose definition of acids and bases emphasizes the role of protons? Back The Answer is Brønsted-Lowry

33. Random Points 300 Points

34. Identify the Acid or Base - 200 An Arrhenius Acid increases the _____________ concentration. Back The Answer is hydronium.

35. Identify the Acid or Base - 300 In the reaction H 3 PO 4 + H 2 O  H 3 O + + H 2 PO 4 -, the ion H 2 PO 4 - acts as a(n) ___________________. Back The Answer is base.

36. Daily Double

37. Identify the Acid or Base - 400 Label the acid, base, conjugate acid, and conjugate base in the equation: HCl(g) + H 2 O(l)  H 3 O + (aq) + Cl - (aq) Back acid baseconj acid conj base

38. pH - 100 What is the pH of a neutral solution at 25°C? Back The Answer is 7.

39. Random Points 500 Points

40. pH - 200 The pH of a solution is 8. What is its H 3 O + concentration? Back The Answer is 1x 10 -8

41. pH - 300 What is the pH of a 1 x 10 -3 M KOH solution? Back The Answer is 11.

42. pH - 400 What is the pH of a 0.00870 M KOH solution? Back The Answer is 11.9.

43. K w and K a – 100 What is the value of the self-ionization constant of water? Back The Answer is 1 x 10 -14

44. K w and K a – 200 What is the equilibrium expression (K w ) for the self-ionization of water? Back The Answer is K w =[OH - ][H 3 O + ]

45. K w and K a – 300 What is the acid-ionization constant, Ka, for the ionization of acetic acid, shown in the reaction CH 3 COOH(aq) + H 2 O(l)  H 3 O + (aq) + CH 3 COO – (aq)? Back The Answer is [H 3 O + ][CH 3 COO - ]/[CH 3 COOH]

46. Daily Double

47. K w and K a – 400 A 0.845 M sample of carbonic acid, H 2 CO 3, has a measured hydronium ion concentration of 5.36 x 10 –3 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is H 2 CO 3 (aq) _ + H 2 O (l)  H 3 O + (aq) + HCO 3 - (aq) Back The Answer is 3.4 x 10 -5

48. Titrations - 100 During a titration the volume of the titrant is measured with a(n) ____________________. Back The Answer is buret or burette

49. Titrations - 200 What unknown quantity can be calculated after performing a titration? Back The Answer is concentration or volume.

50. Titrations - 300 During a titration, the indicator _________________________ is used to study neutralizations of weak acids with strong bases. Back The Answer is phenolphthalein.

51. Daily Double

52. The Answer is 0.0338 Titrations - 400 Calculate the molarity of a Ba(OH) 2 solution if 1950 mL is completely titrated by 261 mL of 0.505 M HNO 3. Ba(OH) 2 + 2HNO 3  Ba(NO 3 ) 2 + 2H 2 O Back

53. Definitions – 100 Back The Answer is transition range. The pH range over which an indicator changes color is its _________ _________.

54. Definitions – 200 A(n) ____________________ solution resists changes in pH. Back The Answer is buffer.

55. Random Points 200 Points

56. Definitions – 300 A _____________ ________ is the species that remains after an acid has given up a proton. Back The Answer is conjugate base.

57. Definitions – 400 Water is an example of a(n) _______________________, something that can act as a base or an acid. Back The Answer is amphoteric species

58. The Final Question The final question has to deal with: »Indicators Make your wager and hand it to the teacher

59. What indicator(s) would be the best choice for a titration with an equivalence point at a pH of 7.0? What color would the solution start? What color would the solution be after the titration is over? IndicatorAcid Color pH Transition Range Base Color Thymol Bluered1.2 - 2.8yellow Bromphenol blueyellow3.0 - 4.6blue Bromcresol greenyellow2.0 - 5.6blue Bromthymol blueyellow6.0 - 7.6blue Phenol Redyellow6.6 - 8.0red Alizarin yellowyellow10.1 - 12.0red

60. And the Answer is: The Answer is Bromthymol blue, yellow, blue and Phenol Red, yellow, red