Endothermic & Exothermic Reactions Video Lessons

Concept: Endothermic Reactions

# Problem: The temperature was then adjusted. When the equilibrium reaction was cooled (temperature was decreased), the equilibrium color changed to orange. On the other hand, when the temperature was increased, the intensity of the color yellow increased. How can you account for these results? Choose all that apply.A) The forward reaction was endothermic B )The temperature catalyzed the reaction.C) The energy of activation was very highD) The energy of the products is smaller than the energy of the reactantsE) The backward reaction is exothermic

###### FREE Expert Solution

Recall that:

Exothermic reactions

lose energy, releases heat, temperature of the surroundings increases
▪ involves bond formation (for phase change: gas → liquid → solid)
ΔH is negative

Endothermic reactions

gain/requires energy, absorbs heat, temperature of the surroundings decreases
▪ involves breaking bonds (for phase change: solid → liquid → gas)
ΔH is positive

Analyzing process given:

Assume that orange is the reactant and yellow is the product.

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###### Problem Details

The temperature was then adjusted. When the equilibrium reaction was cooled (temperature was decreased), the equilibrium color changed to orange. On the other hand, when the temperature was increased, the intensity of the color yellow increased. How can you account for these results? Choose all that apply.

A) The forward reaction was endothermic

B )The temperature catalyzed the reaction.

C) The energy of activation was very high

D) The energy of the products is smaller than the energy of the reactants

E) The backward reaction is exothermic

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