Topic 3 - Particle model of matter ( 2. internal energy and changes of state ) Flashcards
1
Q
what is internal energy of a system
A
the total energy that its particles have have in their kinetic energy stores
2
Q
how does a substance change state
A
if the substance is heated enough the particles will have enough energy in kinetic energy stores to break the bonds holding them together.
3
Q
solid to gas
A
sublimating
4
Q
solid to liquid
A
melting
5
Q
liquid to solid
A
freezing
6
Q
liquid to gas
A
boiling or evaporating
7
Q
gas to liquid
A
condensing
8
Q
why are there flat spots on a heating graph
A
this is where energy is being transferred by heating but not used to change temperature.
