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GCSE
Gcse Chemistry
Energy From Reactions
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Q.1
What is the value for ΔH for respiration?
0%
3210kJ/mol
0%
-3253kJ/mol
0%
-6999kJ/mol
0%
6501kJ/mol
Q.2
Pick the correct combination for the correct information regarding bond energies.
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Bond breaking - Exothermic - Takes in energy Bond making - Endothermic - Gives out energy
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Bond breaking - Endothermic - Takes in energy Bond making - Exothermic - Gives out energy
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Bond breaking - Endothermic - Gives out energy Bond making - Exothermic - Takes in energy
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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?
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It is endothermic
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More energy was taken in than given out
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It is exothermic
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The temperature decreased
Q.4
Using the bond energies provided, calculate the energy change for this reaction. 2CH + O → 2CH OH
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-1471kJ/mol
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-329kJ/mol
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-89kJ/mol
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+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.
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-93kJ
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-4599kJ
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1401kJ
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93kJ
Q.6
Use the bond energies provided to calculate the energy change in the following reaction.
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-247kJ/mol
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-1543kJ/mol
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-185kJ/mol
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-158kJ/mol
Q.7
Use the bond energies provided to calculate the amount of energy given out when propane is burnt.
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2054kJmol-1
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-628kJmol-1
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1958kJmol-1
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-2054kJmol-1
Q.8
If ΔH for a reaction is negative, what does this tell us about the reaction?
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It is endothermic
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More energy is taken in to break bonds than is given out when bonds form
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It is exothermic
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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.
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3253kJ/mol
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-3201kJ/mol
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-6999kJ/mol
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6501kJ/mol
0 h : 0 m : 1 s
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