7.6 CHAPTER 7. ENERGYCHANGES IN CHEMICAL REACTIONS
- The cellular respiration reaction is catalysedby enzymes. The equation for the reac-
tion is:
C 6 H 12 O 6 + 6O 2 → 6 CO 2 + 6H 2 O
The change in potentialenergy during this reaction is shown below:
6CO 2 + 6H 2 O
C 6 H 12 O 6 + 6O 2
activation
energy
ΔH
Time
Potential energy
(a) Will the value of ΔH be positive or negative? Give a reason for your answer.
(b) Explain what is meant by ’activation energy’.
(c) What role do enzymes play in this reaction?
(d) Glucose is one of the reactants in cellular respiration. What important chemical
reaction produces glucose?
(e) Is the reaction in your answer above an endothermic or an exothermic one?
Explain your answer.
(f) Explain why propernutrition and regular exercise are important inmaintaining
a healthy body.
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