Endothermic & Exothermic Reactions Video Lessons

Concept: Endothermic Reactions

# Problem: Complete the following sentences about endothermic and exothermic changes.Exothermic changes: the system _ the surroundings. The heat _____ by the surroundings _____ the freedom of motion of the particles which _____ the entropy of the surroundings. Therefore qsys _____  0, qsurr _____  0 and, ΔSsurr _____ 0Endothermic changes: the system _____ the surroundings. This heat _____ by the surroundings _____ the freedom of motion of the particles which _____ the entropy of the surroundings. Therefore qsys _____  0, qsurr _____ 0 and, ΔSsurr _____ 0

###### 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

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###### Problem Details

Complete the following sentences about endothermic and exothermic changes.

Exothermic changes: the system _ the surroundings. The heat _____ by the surroundings _____ the freedom of motion of the particles which _____ the entropy of the surroundings. Therefore qsys _____  0, qsurr _____  0 and, ΔSsurr _____ 0

Endothermic changes: the system _____ the surroundings. This heat _____ by the surroundings _____ the freedom of motion of the particles which _____ the entropy of the surroundings. Therefore qsys _____  0, qsurr _____ 0 and, ΔSsurr _____ 0

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