Problem: Which process is endothermic?a. The burning of candle wax.b. The combustion of natural gas in a stove.c. The formation of a chemical bond.d. The melting of ice.

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We’re being asked to identify which of the given processes is endothermic

Recall that:

Exothermic reactions

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

Endothermic reactions

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

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Problem Details

Which process is endothermic?

a. The burning of candle wax.

b. The combustion of natural gas in a stove.

c. The formation of a chemical bond.

d. The melting of ice.

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