A, B, C, and D are processes involved in interchanging the states of a matter as shown below :
Which of these processes, A, B, C, or D involve (s) heat loss?
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Solution
Solid- Liquid (A): The process of a solid becoming a liquid is called melting. Thus step A is melting. Energy is absorbed in this process.
Liquid - Gas (B): The process of a liquid becoming gas is called evaporation. Thus step B is evaporation. Energy is absorbed in this process.
Gas-Liquid (C): The process of gas becoming liquid is called condensation. Thus step C is condensation. During this process, heat is released in this process.
Liquid-Solid (D): The opposite process, a liquid becoming a solid, is called solidification. Thus step D is solidification. During this process, heat is released known as the heat of solidification.
Thus, process (C) and (D) releases energy while the state change.
