Multiple Choice
Which is the best explanation of why heat is released when wood burns?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following changes of state results in a decrease in the kinetic energy of the particles?
A
Evaporation
B
Sublimation
C
Melting
D
Condensation
Verified step by step guidance1
Recall that kinetic energy of particles is related to their temperature and motion; when particles lose kinetic energy, they generally move slower and the temperature decreases.
Identify the processes: Evaporation is the change from liquid to gas, Sublimation is solid to gas, Melting is solid to liquid, and Condensation is gas to liquid.
Understand that during phase changes from solid to liquid or liquid to gas (melting, evaporation, sublimation), particles gain kinetic energy to overcome intermolecular forces.
Conversely, during condensation (gas to liquid), particles lose kinetic energy as they slow down and come closer together, releasing heat to the surroundings.
Therefore, the change of state that results in a decrease in kinetic energy of the particles is condensation.
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