Kinetic Molecular Theory

Equilibrium

Rate of condensation = Rate of Evaporation

The average k.e of the particles are indiacted by

Temperature

Building bonds (IMF up)

P.E down, V.P down

Breaking bonds (IMF down)

P.E up, V.P up

Plateu on a graph =

Phase change

Normal Boiling point of water (°C)

100°C

• Spaces between particles

• Particles in contant motion

• Forces of attraction

• Temp up, speed up. Temp down, speed down

The K.M.T

Two kinda of solids

Crystaline and amorphous

• Has crystals

• Molec. lined up close tgt

Crystaline

• no crystals

• molec. not particular arrangement

amorphous

Heat moves from surroundings into system

Endothermi

Heat moves out of system into surroundings

Exothermic

Difference between evap. & boiling

Evap. slower, layer by layer on surface

Boiling faster, throughout liquid

What assists Evap.

• wind

• increased s.a

• hear

• nature of liquid

• V.P

What is potenial energy?

Energy of interactions or imps of the particles

What is kinetic energy?

Energy ko the motion or movement of the particles

If the substance is changing state. the P.E is…

changing

P.E up

IMF down

P.E down

IMF up

Kinetic

relating or resulting from motion

Elastic collision

Collison where the k.e and momentum of the object is conserved

Motion of gas particles

Constant random and rapid motion in straight lines until they collide w other particles or walls of conainer

1 Atm

760 mmHg or 101.325 kPa

760 mmHg

1 Atm

101.325kPa

1 Atm

IMF down

amount of vapour up

Volatile

Low IMF, high V.P

Temp up

amount of vapour up

Boilng point

the temp which the v.p of the subtance = atmospheric pressure

Temp up

v.p up