Thermal

Question 1

If it says find speed of molecules, how can you find the mass of ONE MOLECULE if you know molar mass?

IMPORTSNT

Answer 1

Molar mass = mass of one mole of atoms
So mass of one molecule = molar mass / AVAGADRO

don’t lack
Answer should be somehtinf big anyways, so use that fact to check (for the speed)

Question 2

When increasing TEMPERTAURE, what energies increase (be careful)

Answer 2

Kinetic for sure
POTENTIAL ENERGY INCREASES TOO ( but minimally)
— this is because increasing temp makes them increase amplitude , or be further away from each other, and thus potential energy has increased ! (Closer to 0, ore port will to make binds)

Question 3

What is the motion and arrangement of a solid particles

What happens to this as it’s heated ( temp goes up?)

IMPORTSNT

Answer 3

Arrangement =
- arranged in a regular fixed lattice
- particles are very close to each other

Motion
= - particles vibrate ( in SHM)

2) as heated, the spacing between particles increase with temperature.
- the amplitudes at which the particles vibrate at increase with temperature

Question 4

What is the arrangement and motion for liquid?

How does arrangement / motion change when heated

Answer 4

Arrangement = no regular structure
- particles are close together but not as close as a solid

• motion = particles are free to move around each other snd flow

2) when heated particles move around each other with increasing speed, and are further away