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q of ice and q of water

Posted: Wed Feb 12, 2020 2:27 pm
by 605324529
Why does q_ice= -q_water?
Thanks!

Re: q of ice and q of water

Posted: Wed Feb 12, 2020 2:29 pm
by Elizabeth Harty 1A
The heat lost by the water (indicated by the negative sign) is equal to the heat gained by the ice (the positive sign).

Re: q of ice and q of water

Posted: Wed Feb 12, 2020 2:44 pm
by Minh Ngo 4G
Because all the heat lost by water ( - sign) has to be gained by ice ( + sign). Even though it doesn't matter, it is conventional to put the negative sign on the side that lost heat, and since heat flows from hot to cold, in this case, you would put the negative sign on q water

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 5:15 pm
by Betania Hernandez 2E
The heat lost by the system is the heat gained by the surroundings. In this case, since the heat is lost by the water it is negative and the heat of the ice is positive since it gained the heat.

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 5:19 pm
by Ashley Nguyen 2L
If ice is placed in water, the system will attempt to equilibrate with heat flow from the water to the ice. Therefore, qWater = -qIce. This can also be derived from the fact that qWater + qIce = 0, since all heat is being exchanged between the 2 objects and nothing else.

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 7:00 pm
by Anokhi Patel 2B
Because in the phase change heat lost from the water must equal the negative heat gained by the ice.

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 7:02 pm
by Bryce Barbee
This is because energy has to be conserved. Therefore, if heat is loss by ice when turning to water, then that equal amount of energy must be transferred to the water.

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 7:23 pm
by Jacob Villar 2C
Due to conservation of energy, the heat lost by the water must be equal to the heat gained by the ice

Re: q of ice and q of water

Posted: Sun Feb 16, 2020 8:08 pm
by KHowe_1D
The heat lost by the water has been gained by the ice so you have negative q_water and a positive q_ice.