particulate nature of matter

Question 1

what does the kinetic particle theory state

Answer 1

1. all matter is made up of tiny particles
2. particles are in constant and random motion, colliding with one another

Question 2

answering technique for particulate nature of matter

Answer 2

MADAME
model, arrangement, distance, forces of attraction, movement, energy

Question 3

describe what happens during melting

Answer 3

particles will gain heat and hence gain kinetic energy, vibrating faster. the particles will overcome the forces of attraction between them and move further apart. particles will now slide over one another

Question 4

describe what happens during freezing

Answer 4

particles will lose heat, and hence lose kinetic energy, moving more slowly. the forces of attraction between the particles become stronger and the particles move closer to one another. all the particles vibrate about their fixed positions.

Question 5

what is sublimation

Answer 5

sublimation is the change from a solid to a gas, without melting

Question 6

what are the four substances that sublime

Answer 6

iodine, ammonium chloride, naphthalene and dry ice (solid carbon dioxide)

Question 7

what is the reverse of sublimation

Answer 7

deposition

Question 8

what is diffusion

Answer 8

diffusion is the process whereby particles move from a. region of higher concentration to a region of lower concentration due to constant random motion of the particles.

Question 9

what happens to the rate of diffusion as temperature increases

Answer 9

the rate of diffusion will increase

Question 10

what are the units of relative molecular mass

Answer 10

no units!!

Question 11

how many decimal places is relative molecular mass recorded to

Answer 11

1dp

Question 12

a gas with lower relative molecular mass will diffuse faster or slower?

Answer 12

faster

Question 13

what are the two factors that affect the rate of diffusion

Answer 13

1. temperature
2. Mr