The rate of the given reactions from graphs has to be ranked. The Δ H values for each reaction and which reaction is exothermic and which reaction is endothermic has to be determined. Concept introduction: Exothermic reaction: Exothermic reaction is said to be a chemical reaction in which energy will released in the form of heat. In general this reaction has to be represented as follows. Reactants → Products + Energy Endothermic reaction: Endothermic reaction is said to be a chemical reaction in which energy will consumed in the form of heat. In general this reaction has to be represented as follows. Reactants + Energy → Products

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Chapter 13, Problem 13.117QP

Interpretation Introduction

Interpretation:

The rate of the given reactions from graphs has to be ranked. The ΔH values for each reaction and which reaction is exothermic and which reaction is endothermic has to be determined.

Concept introduction:

Exothermic reaction: Exothermic reaction is said to be a chemical reaction in which energy will released in the form of heat. In general this reaction has to be represented as follows.

Reactants → Products + Energy

Endothermic reaction: Endothermic reaction is said to be a chemical reaction in which energy will consumed in the form of heat. In general this reaction has to be represented as follows.

Reactants + Energy→ Products

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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 thereaction 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 yourprediction. h. Your friend is looking at your graph and states that she believes that step (ii) is the ratedetermining step. Do you agree with her? Justify your reasoning.