Latent Heat Problem/ Phase Change .Please Help

  • Thread starter jdhutto
  • Start date
  • #1
17
0
Latent Heat Problem/ Phase Change.....Please Help!!!!!!!

At 1:00pm you place an ice cube tray in the freezer. Each of the 12 1-gram cubes has a temperature of 20°C. At 1:10 the water temperature has dropped to 12°C. At what time will you have ice?

i have been messing around with this problem for like 20 minutes and I am missing something, I am using Q=mc delta T, and i know it takes 1 cal/g/degree C to go from 20 down to zero, and you have to add the latent heat from water to ice to that to get Q total, i just cant figure out how to work the time factor in.......please help, thanks
 

Answers and Replies

  • #2
alphysicist
Homework Helper
2,238
2


Hi jdhutto,

At 1:00pm you place an ice cube tray in the freezer. Each of the 12 1-gram cubes has a temperature of 20°C. At 1:10 the water temperature has dropped to 12°C. At what time will you have ice?

i have been messing around with this problem for like 20 minutes and I am missing something, I am using Q=mc delta T, and i know it takes 1 cal/g/degree C to go from 20 down to zero, and you have to add the latent heat from water to ice to that to get Q total, i just cant figure out how to work the time factor in.......please help, thanks

I believe that they want you to assume that the rate of heat flow out of the ice is constant. Do you see what to do now?
 

Related Threads on Latent Heat Problem/ Phase Change .Please Help

Replies
12
Views
394
  • Last Post
Replies
12
Views
11K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
4
Views
5K
  • Last Post
Replies
3
Views
2K
Replies
5
Views
6K
  • Last Post
Replies
12
Views
13K
Replies
13
Views
724
Replies
1
Views
2K
Top