Question

A student does an experiment changing ice into water. The mass of the ice is 1Kg in the beginning. The student then heats it on a hotplate and the mass is now 0.8 kg. Why is the mass of the water that results lower than that of the initial ice? Where do you think that mass could have gone? Does conservation always apply?

Answer 1

Conservation always applies. Something to do with latent heat?

Answer 2

are u askiing?

Answer 3

yes do you think it could be latent heat?

Answer 4

genuinely i dont know, trying to come up with an answer

Answer 5

The two most probable causes are that there was a loss due to evaporation (assuming an open container) or a measurement error due to any number of reasons.

Answer 6

so there is no missing mass or gained mass because of the latent heat energy?

Answer 7

Latent energy would not cause that much of a difference.

Answer 8

okay,

Answer 9

Note also there is a difference between the density of ice and water but it is relatively small and also would not make the error that large.

Answer 10

Look at:
http://www.engineeringtoolbox.com/water-density-specific-weight-d_595.html

Note that it would be best to make sure that the measurement of mass be take below 10 deg C for the liquid case. let the fluid cool after melting.

Answer 11

due to evaporation..