Which of the following is described by the equation $H _2 O (t) \rightarrow H _2 O (s)+$ heat?
A. Evaporating
B. Condensing
C. Melting
D. Freezing
Answer (1)
The equation represents the transformation of liquid water to solid water (ice) with the release of heat.
Evaporating, condensing, and melting are different phase transitions.
Freezing is the process where a liquid turns into a solid.
Therefore, the correct answer is D .
Explanation
Analyzing the Equation The equation H 2 O ( l ) i g h t ha r p oo n u p H 2 O ( s ) + h e a t describes a process where water in its liquid state ( H 2 O ( l ) ) transforms into water in its solid state ( H 2 O ( s ) ), and heat is released during this process. We need to identify which of the given options matches this description.
Understanding the Options
Evaporating: This is the process where a liquid turns into a gas.
Condensing: This is the process where a gas turns into a liquid.
Melting: This is the process where a solid turns into a liquid.
Freezing: This is the process where a liquid turns into a solid.
Identifying the Correct Phase Transition The equation shows water changing from liquid to solid. This corresponds to the definition of freezing.
Conclusion Therefore, the correct answer is D. Freezing .
Examples
Freezing is a common phenomenon we observe in everyday life. For example, when you put water in the freezer, it turns into ice. This process is described by the equation H 2 O ( l ) i g h t ha r p oo n u p H 2 O ( s ) + h e a t , where the release of heat is what allows the water molecules to slow down and form the crystalline structure of ice. Understanding phase transitions like freezing is crucial in various applications, from food preservation to weather forecasting.
