What phase change is shown in the accompanying molecular art? Is energy absorbed or released during the process?
Interpretation:
The phase change accompanying the molecular art and the process of reaction (exothermic and endothermic) has to be given.
The given diagram is,
Figure 1
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.
Vaporization:
Vaporization means conversion of a substance from the liquid phase to the gaseous phase.
Explanation of Solution
The given diagram is,
Figure 1
The change in phase can be identified by the distance between the spheres and the level of organization. A solid has closely packed spheres that are well organized, a liquid has closely packed but randomly arranged spheres, and a gas has randomly arranged spheres that are farther away from each other.
The diagram 1 represents a liquid and the diagram two represents a gas. Vaporization is the process of change from liquid to gas. Thus., the phase change accompanied in the figure 1 is a vaporization process and it is an endothermic process because liquid molecules absorb energy to go from liquid state to gaseous state.
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Principles of General, Organic, Biological Chemistry
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