Q.1
What is the value for ΔH for respiration?
  • 3210kJ/mol
  • -3253kJ/mol
  • -6999kJ/mol
  • 6501kJ/mol
Q.2
Pick the correct combination for the correct information regarding bond energies.
  • Bond breaking - Exothermic - Takes in energy Bond making - Endothermic - Gives out energy
  • Bond breaking - Endothermic - Takes in energy Bond making - Exothermic - Gives out energy
  • Bond breaking - Endothermic - Gives out energy Bond making - Exothermic - Takes in energy
  • Bond breaking - Exothermic - Gives out energy Bond making - Endothermic - Takes in energy
Q.3
The overall energy change in a chemcial reaction is -24kJ/mol. What does this tell us about the reaction?
  • It is endothermic
  • More energy was taken in than given out
  • It is exothermic
  • The temperature decreased
Q.4
Using the bond energies provided, calculate the energy change for this reaction. 2CH + O → 2CH OH
  • -1471kJ/mol
  • -329kJ/mol
  • -89kJ/mol
  • +2567kJ/mol
Q.5
In the Haber process, nitrogen and hydrogen are reacted together to produce ammonia. Use the bond energies provided to calculate the overall energy change in the reaction.
  • -93kJ
  • -4599kJ
  • 1401kJ
  • 93kJ
Q.6
Use the bond energies provided to calculate the energy change in the following reaction.
  • -247kJ/mol
  • -1543kJ/mol
  • -185kJ/mol
  • -158kJ/mol
Q.7
Use the bond energies provided to calculate the amount of energy given out when propane is burnt.
  • 2054kJmol-1
  • -628kJmol-1
  • 1958kJmol-1
  • -2054kJmol-1
Q.8
If ΔH for a reaction is negative, what does this tell us about the reaction?
  • It is endothermic
  • More energy is taken in to break bonds than is given out when bonds form
  • It is exothermic
  • The temperature of the reaction mixture decreases
Q.9
Use the bond energy values provided to calculate ΔH for the reaction of photosynthesis. 6CO + 6H O → C H O + 6O Hint: For glucose (cyclical) there are the following bonds formed: 7xC-H, 5xC-C, 7xC-O and 4xO-H.
  • 3253kJ/mol
  • -3201kJ/mol
  • -6999kJ/mol
  • 6501kJ/mol
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