1a-states of matter

Question 1

Name the processes
responsible for the following
phase changes: solid ⇄ gas

Answer 1

s to g - sublimation
g to s - Deposition

Question 2

What is diffusion?

Answer 2

It is the overall movement of particles from an area of high concentration to an
area of low concentration.

Question 3

What is a solubility curve?

Answer 3

It is a curve that shows how the solubility of a substance (in grams per 100 g of
water) changes with temperature.

Question 4

Outline two main assumptions of the kinetic theory of matter.

Answer 4

a) Matter is made up of atoms, molecules and ions of different sizes.
b) At the same temperature, small particles move faster than large particles

Question 5

describe the structure of solids

Answer 5

1- particles are fixed in a regular arrangement
2- particles are very close together
3- particles vibrate
4 strong forces of attraction between the particles

Question 6

what is melting?

Answer 6

the process by which a solid turns into a liquid

Question 7

what is condensation?

Answer 7

the process by which a gas turns into a liquid

Question 8

which has the highest density - solids, liquids or gases?

Answer 8

solids, as the particles are closest together in solids

Question 9

describe the structure of liquids

Answer 9

1- particles are arranged randomly
2- particles are close together
3- the particles are free to move in random motion
4- medium forces of attraction between the particles

Question 10

describe the structure of gases

Answer 10

1- particles are arranged randomly
2- particles are far apart
3- particles are free to move in random motion
4- weak/no forces of attraction between the particles

Question 11

true or false:

particles in a liquid move quickly in all directions

Answer 11

false:

they have restricted movement and move around each other.

Question 12

true or false:

the melting point and freezing point of a substance are the same.

Answer 12

true:

there is no difference between the melting point and freezing point