What occurs when heat is added or removed from water?

• A. Only the temperature changes
• B. Only the state of the water changes
• C. Both temperature and state can change
• D. Neither temperature nor state change

Answer: (C)

When heat is added to or removed from water, both its temperature and state can change. For instance, when heat is added to ice at 0 degrees Celsius, it melts and transitions from solid to liquid, thus changing its state. At the same time, if you continue to heat the liquid water, its temperature rises until it eventually reaches its boiling point and begins to vaporize into steam, further altering its state. Conversely, removing heat from water can lead to a decrease in temperature until it reaches the freezing point, at which point it transitions from liquid to solid. This demonstrates that the interaction of heat with water directly influences both its temperature and physical state, confirming why this answer is accurate.