Interpretation:
The phase change accompanying the molecular art and the process of reaction (exothermic and endothermic) has to be given.
Concept introduction:
Endothermic Reactions:
The endothermic process is a term that describes a reaction where the system absorbs the energy from its surrounding in the form of heat. Few examples of endothermic process is photosynthesis, evaporating liquids, melting ice.
Exothermic reaction:
The exothermic reaction is the opposite of an endothermic reaction. It releases energy by light or heat to its surrounding. Few examples are neutralization, burning a substance, reactions of fuels, deposition of dry ice, respiration.
Condensation reaction:
Condensation is the change of water from its gaseous form into liquid water.

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Chapter 4 Solutions
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