1. What is the temperature shown on the scale all the time as ice slows melts? What should be the unit of the reading? 2. Did the temperature change as time lapse? Explain why? 3. In this process, was the ice absorbing energy (heat) from the surroundings?
Lab 5 Phase Change
Objectives
In this lab, students will study the phase changing process of ice and observe the
the temperature of melting ice.
Supplies
https://www.youtube.com/watch?v=Dq7DeuDaCEM
Theory
As discussed in the lecture, the phase change is the state change of a matter, such as from
ice to liquid water, from liquid water to steam, or the other way around. When phase
change happens, the temperature of the substance stays the same, but a large amount
of energy (heat) is required for the change to happen. For example, when the snow melts, it
absorbs a lot of heat from the surroundings. This energy can be calculated using the
following formula:
Q=mL
, where L means the latent heat of a substance changing from one state to another. For
example,Lf means the latent heat of fusion. The Lf of water is 80 cal/g (Remember
that the specific heat capacity of water is 1 cal/g ∙ ℃), which means that 1 g of ice
needs to absorb 80 calories of heat to melt and becomes liquid water.
Procedure
Watch the Temperature of Melting Ice (multiple times if necessary) and answer the
questions listed below.
questions and Problems
1. What is the temperature shown on the scale all the time as ice slows melts? What
should be the unit of the reading?
2. Did the temperature change as time lapse? Explain why?
3. In this process, was the ice absorbing energy (heat) from the surroundings?
4. What are the factors that decide the total energy (heat) the ice need to absorb to
melt completely?
5. Which will be bigger, the heat required to increase 1 g of water by 1 ℃, or the heat
required to change 1 g of ice to liquid water? Explain
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