particle model of matter

Question 1

particle model of matter (4)

Answer 1

1. everything is made of tiny particles
2. particles move
3. there are spaces between particles
4. there are forces between particles

Question 2

brownian motion (1)

Answer 2

random motion of molecules/large particles in air due to them hitting eachother
→ smoke particles

Question 3

effects of heat of particles (3)

Answer 3

• heat can make solids melt and liquids evaporate
• gives particles energy to move
• heat causes change of state due to it weakening attractive forces with energy

Question 4

bromine diffusion (4)

Answer 4

• bromine easily evaporates (dark red gas)
• movement from a higher concentration to a lower concentration
• diffuses slowly in air because of it bumps into air particles
• moves faster in a vacuum because there’s no air particles to bump into

Question 5

sublimation (2-ish)

Answer 5

solid → gas
reverse sublimation:
gas → solid

Question 6

melting (1)

Answer 6

solid → liquid

Question 7

freezing (1)

Answer 7

liquid → solid

Question 8

evaporation (1)

Answer 8

liquid → gas

Question 9

condensation (1)

Answer 9

gas → liquid