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When ammonium chloride (NH_4Cl) dissolves in water, the temperature of the solution decreases. Is this process endothermic or exothermic?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which one of the following is an endothermic process?
A
Combustion of methane
B
Neutralization of hydrochloric acid with sodium hydroxide
C
Condensation of steam to liquid water
D
Melting of ice to form liquid water
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Understand the definition of an endothermic process: it is a process that absorbs heat from the surroundings, causing the system to gain energy.
Analyze each given process to determine whether it absorbs or releases heat:
- Combustion of methane is an exothermic reaction because it releases heat as methane burns.
- Neutralization of hydrochloric acid with sodium hydroxide is also exothermic, releasing heat when an acid and base react.
- Condensation of steam to liquid water is exothermic because it releases heat as gas turns into liquid.
- Melting of ice to form liquid water is endothermic because it requires heat absorption to change solid ice into liquid water.
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