Question

16.
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x axis label:

1. identify if the following chemical reactions are endothermic (endo) or exothermic (exo).

a. burning of coal
b. sublimation of co₂
c. freezing of ice
d. boiling an egg
e. condensing water vapors to liquid

Explanation:

• a. Burning of coal releases heat, so it is exothermic.
• b. Sublimation of CO₂ requires heat input, so it is endothermic.
• c. Freezing of ice releases heat as the substance changes from liquid to solid, so it is exothermic.
• d. Boiling an egg requires heat to denature proteins, so it is endothermic.
• e. Condensing water vapors to liquid releases heat as the substance changes from gas to liquid, so it is exothermic.

Answer:

a. exo
b. endo
c. exo
d. endo
e. exo