How does energy affect the melting point of water?

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Homework Help Overview

The discussion revolves around the relationship between energy and the melting point of water, specifically focusing on the melting of ice and the energy required to achieve this phase change.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the concept of energy transfer from a heater to water and question the conditions necessary for ice to melt. There are inquiries about the specific temperature at which ice melts and whether additional energy is required beyond reaching that temperature.

Discussion Status

The discussion is active, with participants raising questions about the melting point of ice and the energy dynamics involved. Some guidance has been offered regarding the power of the heater and the need for energy beyond just reaching 0 degrees Celsius to fully melt ice.

Contextual Notes

Participants are considering the implications of energy transfer and the phase change of water, with references to graphs and previous problems related to temperature changes.

physicsstudent111
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Homework Statement
A 0.25 kg piece of ice is warmed by an electric heater and the following graph of temperature is produced. Assume that there has been no loss of energy to the surroundings
a) How much additional time after 150s will be required to melt all the ice
Relevant Equations
Q=mct
Q=mct+mLf
IMG_20220814_133446__01.jpg

Im not really sure how to answer this question. Would you have any ideas?
 
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The electric heater is giving off energy to the water.
What can you say regarding the power of the heater? Look at the graph
 
... what does it take to melt ice?
 
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In the graph we can say the heater warms the water 10 degrees every 75s and to melt ice we need to reach a temperature of 0 degrees
 
physicsstudent111 said:
In the graph we can say the heater warms the water 10 degrees every 75s and to melt ice we need to reach a temperature of 0 degrees
Does the ice automatically melt at 0 degrees?

Or, does water freeze into ice at 0 degrees?
 
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Yes but you need to think in terms of energy. It is not enough to heat ice to 0deg to make it melt.
I gave you a hint earlier regarding the power of the heater
 
I think the melting point for water is 0 degrees. But I am not really sure what to say about the energy. Does there have to be more energy to fully melt the ice?
 
physicsstudent111 said:
I think the melting point for water is 0 degrees. But I am not really sure what to say about the energy. Does there have to be more energy to fully melt the ice?
Yes, look it up online. Ice is hard to melt. Think about its use to keep a drink cold.
 
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physicsstudent111 said:
I think the melting point for water is 0 degrees. But I am not really sure what to say about the energy. Does there have to be more energy to fully melt the ice?
You wrote the formulas here, also you recently did problem with turning 100 deg water into steam. Similar logic applies to when you go from solid to liquid
 
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