The particulate nature of matter Flashcards
1
Q
What is diffusion?
A
the movement of particles from a region of high concentration to a region of lower concentration
2
Q
What is Brownian motion?
A
random molecular bombardment of large visible particles by molecules, atoms or ions
3
Q
Where is evidence for Brownian motion?
A
Observations of the motion of tiny visible particles suspended in liquids or gases
4
Q
Why is rate of diffusion dependent on molecular mass?
A
Greater the molecular mass => heavier the molecule
Molecules with lower mass move faster than those with higher mass
Lighter molecules diffuse faster than heavier molecules
5
Q
What is the kinetic theory? (3)
A
- All matter consists of particles
- There are forces of attraction between the particles
- Particles possess kinetic energy to vibrate and move
