internal energy and changes of state

Question 1

What do the particles in a system do and where do they have energy ?

Answer 1

vibrate or move around. They have energy in their kinetic energy stores and potential energy stores due to their positions

Question 2

The energy stored in a system..
The internal energy of a system

Answer 2

The energy stored in a system is stored by it’s particles

The internal energy of a system = total energy particles have in their kinetic and potential energy store

Question 3

What occurs as you heat a system and what does it lead to ??

Answer 3

transfer energy to its particles = increase internal energy

Leads to change in temperature or change in state. If temp changes, the size of change depends on mass of substance, what’s its made of and the energy input

Question 4

When does change in state occur ?

Answer 4

when you heat substance enough - particles have enough energy in their kinetic energy stores to break bonds holding them together.

Question 5

heating a liquid
heating solid

Answer 5

it boils, evaporates and turns into gas
it melts and becomes liquid

both are change of states

Question 6

cooling

Answer 6

particles lose energy and form bonds

Question 7

change of states

Answer 7

freezing
melting

boiling or
evaporating

condensing gas to liquid
solid to gas = sublimation

Question 8

what is the change of state ??

Answer 8

physical change - you don’t end up w new substance but same substance in new form.

number of particles don’t change but are arranged differently and mass is conserved.

When a reverse occurs in state of matter, substance returns to original form and properties