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Exothermic, endothermic, rate of reactions

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Exothermic, endothermic, rate of reactions

  1. 1. Exothermic, Endothermic, Rate of Reactions<br />Notes<br />ExothermicEndothermicGives out heatTakes in heatBond formingBond breakingNegative ΔHPositive ΔH<br />EnergyEnergy<br />Activation energyEaProgress of reaction<br />Activation energyEaΔHΔH<br />Progress of reaction<br />ENDOTHERMICEXOTHERMIC<br />Increasing the rate of a reaction:<br /><ul><li>Increase the temperature
  2. 2. Increase the pressure
  3. 3. Increase the concentration of the reactants
  4. 4. Increase the surface area of the reactants
  5. 5. Use a catalyst</li></ul>Workout questions<br /><ul><li>Which of the following reactions are exothermic?
  6. 6. Melting
  7. 7. Boiling
  8. 8. Freezing
  9. 9. Evaporating
  10. 10. Which of the following is true of endothermic reactions?
  11. 11. There is more energy involved in bond breaking than bond forming
  12. 12. There is less energy involved in bond breaking than bond forming
  13. 13. More bonds are broken than formed
  14. 14. Fewer bonds are broken than formed
  15. 15. When an acid neutralizes a base, the beaker holding the solution feels warm. Why?
  16. 16. Heat is absorbed from the surrounding to break bonds
  17. 17. Heat is absorbed from the surrounding to form bonds
  18. 18. Heat is given out to the surrounding by breaking bonds
  19. 19. Heat is given out to the surrounding by forming bonds
  20. 20. In experiment X, an endothermic reaction takes place. Which of the following could be observed?
  21. 21. Bubbles
  22. 22. White ppt
  23. 23. The temperature of the mixture drops
  24. 24. There is strong smell evolved
  25. 25. With which of the following solutions of sulphuric acid does copper (II) oxide react with the fastest initial rate of reaction?
  26. 26. 50g of sulphuric acid in 200cm3 of water
  27. 27. 100g of sulphuric acid in 150cm3 of water
  28. 28. 150g of sulphuric acid in 100cm3 of water
  29. 29. 200g of sulphuric acid in 50cm3 of water
  30. 30. Calcium carbonate is reacted with excess aqueous hydrochloric acid to liberate carbon dioxide gas. How can the experiment be changed to liberate twice the amount of carbon dioxide gas?
  31. 31. Use more calcium carbonate
  32. 32. Use more hydrochloric acid
  33. 33. Heat the mixture using a bunsen burner
  34. 34. Increase the concentration of the hydrochloric acid solution
  35. 35. How does a catalyst work?
  36. 36. It increases the rate of a reaction by lowering the reaction’s activation energy
  37. 37. It increases the rate of a reaction by increasing the reaction’s activation energy
  38. 38. In increases the amount of product that can be formed
  39. 39. It eliminates the need to provide heat energy in order for a reaction to take place
  40. 40. Which of the following statements is true about a catalyst?
  41. 41. It always increases the enthalpy change of a reaction
  42. 42. It always decreases the enthalpy change of a reaction
  43. 43. It does not change the enthalpy change of a reaction
  44. 44. It can either increase or decrease the enthalpy change of a reaction
  45. 45. The enthalpy change of a reaction depends on
  46. 46. The number of bonds formed and broken
  47. 47. The amount of energy needed to form and break bonds
  48. 48. The surrounding temperature
  49. 49. The presence of a catalyst
  50. 50. When a solid X is added to the aqueous solution YZ2, the products are precipitates of XZ3 and Y.
  51. 51. Write a balanced chemical equation to show the reaction
  52. 52. Given the following information about the bond energies, calculate the total energy change that takes place when 1 mol of X is added to an excess of YZ2
  53. 53. kJ/molY-Z500X-Z600
  54. 54. Sketch a labeled energy profile diagram for this reaction
  55. 55. Suggest three possible ways to increase the speed of this reaction
  56. 56. ________________________________________________________________________
  57. 57. ________________________________________________________________________
  58. 58. ________________________________________________________________________
  59. 59. Suggest one possible way to increase the amount of product formed</li></ul>________________________________________________________________________<br /><ul><li>According to the information given,
  60. 60. CompoundΔH of combustion (kJ/mol)A- 2000B- 2500C- 500
  61. 61. Which compound has the most exothermic combustion reaction? Explain.
  62. 62. ________________________________________________________________________
  63. 63. Combustion reactions can never be endothermic. Explain why you agree/disagree with this statement.
  64. 64. ________________________________________________________________________</li></ul>________________________________________________________________________<br />

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