Domanda aperta
Four ice cubes at exactly 0 °C with a total mass of 53.5 g are combined with 115 g of water at 75 °C in an insulated container. If no heat is lost to the surroundings, what is the final temperature of the mixture?
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13. Liquids, Solids & Intermolecular Forces
Heating and Cooling Curves
Scelta multipla
According to the cooling curve of water, which segment represents the phase change from liquid to solid?
A
The flat segment at 100°C
B
The sloped segment above 0°C
C
The flat segment at 0°C
D
The sloped segment below 0°C
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Understand that a cooling curve shows temperature changes of a substance as it loses heat over time.
Identify that during a phase change, the temperature remains constant because the energy is used to change the phase, not to change temperature.
Recognize that the phase change from liquid to solid (freezing) for water occurs at 0°C, so the flat segment at 0°C represents this phase change.
Note that the flat segment at 100°C corresponds to the phase change from gas to liquid (condensation) or liquid to gas (boiling), not freezing.
Understand that sloped segments represent temperature changes within a single phase (liquid above 0°C or solid below 0°C), not phase changes.
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