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What does the heating curve of a substance look like during a phase change?
A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The second change of phase is boiling, as the temperature stays the same during the transition to gas.
What happens in a heating curve?
A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperature. Nevertheless, a plateau is reached when the substance reaches melting point, i.e. changing from solid to liquid.
Why does the heating curve go flat?
The average energy of the particles is increasing as the temperature rises. The heating curve shows that the temperature stays constant until the solid is completely melted. The melting process requires a lot of energy.
How is the freezing point determined from a cooling curve graph?
freezing point of the solution is determined from the graph by drawing two straight lines through the data points above and below the freezing point. The temperature corresponding to the intersection of the two lines is the freezing point of the solution.
How is the heating curve different from the cooling curve?
Heating curves show how the temperature changes as a substance is heated up. Cooling curves are the opposite. They show how the temperature changes as a substance is cooled down.
How does this heating curve illustrates that the heat of vaporization?
How does this heating curve illustrate that the heat of vaporization is greater than the heat of fusion? the change of the heat of vaporization is higher than that of the heat of fusion. segment BC is shorter that DE because BC is melting while DE is evaporating.