Topic 9 Thermodynamics Flashcards
1
Q
Tomatoes can be made into a puree.
The puree is heated. When the puree boils, its temperature stays constant, even though the puree continues to be heated.
Explain this observation in terms of molecular energy changes. (2)
A
-The temperature is constant when the puree boils as the average kinetic energy of the molecules in the puree is constant.
-When boiling occurs the thermal energy supplied increases the potential energy of the molecules, breaking molecular bonds.
2
Q
When is latent heat of fusion applied?
A
-When solid changes to a liquid
3
Q
When is latent heat of vaporisation applied?
A
-When liquid changes to gas
