• Exothermic reactions: lose energy and involve bonds breaking; ΔH is negative
• Endothermic reactions: gain energy and involve bonds forming; ΔH is positive
Evaporation → liquid to gas → energy/heat is needed.
Combustion/burning → energy/heat is released.
Which process is endothermic?
a) the evaporation of water from the skin
b) the burning of candle wax
c) the oxidation of iron in a chemical hand warmer
d) the combustion of natural gas in a stove
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