Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. (i) Cl2 (g) + Pt (s) à 2Cl (g) + Pt (s) Ea = 1550 kJ ∆H = – 950 kJ (ii) Cl (g)+ CO (g) + Pt (s) à ClCO (g) + Pt (s) Ea = 2240 kJ ∆H = 575 kJ (iii) Cl (g) + ClCO (g) à Cl2CO (g) Ea = 2350 kJ ∆H = – 825 kJ

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Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.
(i) Cl2 (g) + Pt (s) à 2Cl (g) + Pt (s) Ea = 1550 kJ ∆H = – 950 kJ
(ii) Cl (g)+ CO (g) + Pt (s) à ClCO (g) + Pt (s) Ea = 2240 kJ ∆H = 575 kJ
(iii) Cl (g) + ClCO (g) à Cl2CO (g) Ea = 2350 kJ ∆H = – 825 kJ

e. Which reaction intermediate would be considered a catalyst (if any) and why?
f. If you were to add 2700kJ of activation energy to the reaction, would you be able to make the
reaction reverse itself (i.e. have the products become reactants)? Justify your answer.
g. If you were to added a positive catalyst to step (iii) what would the end result be? Justify your
prediction.
h. Your friend is looking at your graph and states that she believes that step (ii) is the rate
determining step. Do you agree with her? Justify your reasoning.

Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.
(i) Cl₂ (g) + Pt (s) → 2Cl (g) + Pt (s)
(ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s)
(iii) Cl (g) + CICO (g) → Cl₂CO (g)
Ea = 1550 kJ
Ea = 2240 kJ
Ea = 2350 kJ
ΔΗ = – 950 kJ
ΔΗ = 575 kJ
ΔΗ = − 825 kJ
Transcribed Image Text:Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. (i) Cl₂ (g) + Pt (s) → 2Cl (g) + Pt (s) (ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s) (iii) Cl (g) + CICO (g) → Cl₂CO (g) Ea = 1550 kJ Ea = 2240 kJ Ea = 2350 kJ ΔΗ = – 950 kJ ΔΗ = 575 kJ ΔΗ = − 825 kJ
Which reaction intermediate would be considered a catalyst (if any) and why?
If you were to add 2700kJ of activation energy to the reaction, would you be able to make the
reaction reverse itself (i.e. have the products become reactants)? Justify your answer.
If you were to added a positive catalyst to step (iii) what would the end result be? Justify your
prediction.
Your friend is looking at your graph and states that she believes that step (ii) is the rate
determining step. Do you agree with her? Justify your reasoning.
Transcribed Image Text:Which reaction intermediate would be considered a catalyst (if any) and why? If you were to add 2700kJ of activation energy to the reaction, would you be able to make the reaction reverse itself (i.e. have the products become reactants)? Justify your answer. If you were to added a positive catalyst to step (iii) what would the end result be? Justify your prediction. Your friend is looking at your graph and states that she believes that step (ii) is the rate determining step. Do you agree with her? Justify your reasoning.
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