Calculating Energy Released in Water Temperature Change

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Homework Help Overview

The discussion revolves around calculating the energy released when water changes temperature from 20°C to -10°C, involving concepts of heat transfer and phase changes.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the setup of the energy equation, considering the phases of water and ice, and the temperature changes involved. Questions arise regarding the correct application of the equation and the specific temperature values to use.

Discussion Status

Some participants have provided a general structure for the energy equation, while others express confusion about the specific temperature changes and how to apply them. There is an ongoing exploration of how to set up the problem correctly.

Contextual Notes

One participant notes a lack of understanding due to missed lessons, which may impact their grasp of the concepts involved in the problem.

tornzaer
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Homework Statement


What is the energy released as water changes temperature from 20C to -10C?


Homework Equations


mct+lfm+mct


The Attempt at a Solution


My physics exam is day after tomorrow, however, I have no clue about this question. I was away for a week during these lessons. Can someone please walk me through the question so I can understand.

Thank you very much.
 
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Assuming no heat losses. All the energy released goes into reducing the temperature from 20C to 0C and changing the water's phase and then lowering the temperature of the ice from 0C to -10C
 
Well yes, but how would I set up the equation?
 
[tex]Energy=m_w c_w \Delta \theta_w + m_w l_f +m_ic_i \Delta \theta_i[/tex]

i=ice,w=water.
 
Can you please plug in the digits? I am confused about the temperatures.
 
rock.freak667 said:
[tex]Energy=m_w c_w \Delta \theta_w + m_w l_f +m_ic_i \Delta \theta_i[/tex]

i=ice,w=water.

for the change in temperature of the water it is (20-0)C and for ice it is (0-(-10))=10C.
 

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