About heat question which one is right?

[new hand]

It is given that:

1 kg of 0 degree celsius ice is put into a cup of 0 degree celsius cold water.

is the temperature of the ice and the water remains unchanged?

or the total internal energy remains unchanged?

THX!

 

[adjacent]

0 degree celsius cold water.

I don't think it will be cold water anymore

 

[DrClaude]

It is given that:

1 kg of 0 degree celsius ice is put into a cup of 0 degree celsius cold water.

is the temperature of the ice and the water remains unchanged?

or the total internal energy remains unchanged?

If the system is isolated, both are true.

I don't think it will be cold water anymore

Why? At the temperature of the phase transition, both phases coexist.

 

[adjacent]

Why? At the temperature of the phase transition, both phases coexist.

Oh, I see.:shy: Thanks

 

[new hand]

oh I forget to say
Assume there is no energy transfer between the mixture and the surroundings.

 

[new hand]

But I think in this way,

Even if the ice melts, the energy released by the ice is not enough to lower the temperature of the water. And the temperature of the ice cannot rise because there is no heat transfer.

 

[DrClaude]

Even if the ice melts, the energy released by the ice is not enough to lower the temperature of the water.

You need to add energy to ice to transform it into liquid water.

 

[new hand]

So, will the temperature remain unchanged?

 

[DrClaude]

So, will the temperature remain unchanged?

Yes, unless you want to violate the 0th law of thermodynamics.

Absent any chemical reaction (including dissolution), mixing two things of the same temperature together can only result in something at the same temperature.