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