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
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
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:
?? = ????
, where L means the latent heat of a substance changing from one state to another. For
example, ???? means the latent heat of fusion. The ???? of water is 80 ??????/?? (Remember
that the specific heat capacity of water is 1 ??????/?? ∙ ℃), 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 ?? of water by 1 ℃, or the heat
required to change 1 g of ice to liquid water? Explain
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