14.3 Reaction Rate Energy CP

Which reaction involves reactants with the highest energy?

Which reaction results in products with the lowest energy?

Which reaction requires the greatest activation energy?

Calculate the activation energy of reaction C. (include units)

Classify the reactions

Calculate 𝚫H for Reaction A

Calculate 𝚫H for Reaction B

Calculate 𝚫H for Reaction C

In Reaction B, the activation energy can be reduced by approximately half by mixing the reactants in the presence of a catalyst. Add a dotted line to the graph to indicate how the energy changes as the reaction progresses in the presence of this catalyst.

A scientist is testing a sample of a compound, Substance X, for its suitability for use as a fuel. The scientist finds that the sample will burn in air, reacting with oxygen to give off heat. The energy of the reactants is calculated as about 600 kJ, while the energy of the products is about 500 kJ. The activation energy is estimated to be about 100 kJ. Sketch a solid line on the graph to represent the energy changes for this reaction.

Look at the graph for Reactions A, B, and C and for the reaction of burning Substance X in air. Which of the three reactions might represent burning a fuel in air?