sec 3 chem chap 2

Question 1

arrangement of solid

Answer 1

very closely packed in an orderly manner

Question 2

movement of a solid

Answer 2

vibrate and rotate about fixed positions

Question 3

kinetic energy of a solid

Answer 3

possess very low kinetic energy (move slowly)

Question 4

Force of attraction between the solid particles

Answer 4

strong

Question 5

A solid has a _____ volume and shape

Answer 5

definite

Question 6

A solid cannot be compressed as the particles are …

Answer 6

already very close to one another

Question 7

Arrangement of a liquid

Answer 7

closely packed in a disorderly manner

Question 8

Movement of a liquid

Answer 8

slide past one another freely

Question 9

Kinetic energy of a liquid

Answer 9

possess low kinetic energy

Question 10

Forces of Attraction between liquid particles

Answer 10

less strong compared to a solid

Question 11

A liquid has a ____ volume but not _____

Answer 11

volume, shape

Question 12

Why cant liquid particles be compressed?

Answer 12

their particles are packed quite closely together

Question 13

Arrangement of a gas

Answer 13

very far apart in a disorderly manner

Question 14

Movement of a gas

Answer 14

move quickly and randomly in any direction

Question 15

Kinetic energy in a gas

Answer 15

possess very high kinetic energy (move fast)

Question 16

forces of Attraction between gas particles

Answer 16

very weak forces of attraction

Question 17

a gas has no _____ shape and ______

Answer 17

definite, volume

Question 18

Does a gas take the shape and volume of its container?

Answer 18

Yes, as it can be compressed as the particles have a lot of space between them

Question 19

Forming of bonds =

Answer 19

energy is given out to the surroundings.

Question 20

Breaking of bonds =

Answer 20

energy is absorbed from the surrounding

Question 21

When the state changes from a solid to a liquid or liquid to a gas, The particles

Answer 21

move faster as the kinetic energy of the particles move faster and energy is then gained to the surroundings

Question 22

During , and particles absorb energy from the surroundings

Answer 22

melting, boiling and sublimation

Question 23

When the state changes from a gas to liquid (or liquid to a solid), the particles…

Answer 23

The particles move more slowly (kinetic energy of particles decreases) and Energy is lost to the surroundings. * During freezing, condensation and vapour deposition particles lose energy to the surrounding.

Question 24

During , and particles lose energy to the surroundings

Answer 24

freezing, condensation and vapour deposition

Question 25

during vapour deposition(converting from gas to solid)

Answer 25

Some substances can change directly from a gas to a solid.

Question 26

What is the temperature during vapour deposition

Answer 26

The temperature remains constant during vapour deposition, until all the gas has become a solid.

Question 27

What is the difference between evaporation and boiling

Answer 27

Evaporation can occur at any temperature whereas boiling occurs only at the boiling point of the substance.

Question 28

Particle movement _____ when diffusion is complete.

Answer 28

does not stop and will continue to move randomly, with no net change in concentration observed.

Question 29

Describe the movement of the particles in the gas jar(diffusion)

Answer 29

The bromine molecules diffuse upwards from a region of higher concentration to a region of lower concentration, so the gas jar on top turns browns whereas the Tair particles diffuse downwards from a region of higher concentration to a region of lower concentration, until both gas jars turns to the same brown colour.

Question 30

What increases the rate of diffusion

Answer 30

higher temperatures increase the rate of diffusion as the particles possess greater kinetic energy, making them move faster they are able to move faster(which increases the rate of diffusion)

Question 31

Mass of particles of a substance can be quantified by comparing the

Answer 31

relative molecular mass (Mr ) of the substance.

Question 32

why does the rate of diffusion decrease when there is an Increase in relative molecular mass

Answer 32

Particles with higher particle mass require more kinetic energy to move at the same speed.

Question 33

order of diffusion for ammonia, bromine and hydrogen chloride

Answer 33

1. ammonia 2. hydrogen chloride 3. bromine

Question 34

what is a relative atomic mass?

Answer 34

the bottom number of the element in the periodic table

Question 35

Porous pot – contains

Answer 35

pores that allow gases to diffuse.

Question 36

What reflects the pressure in the porous pot

Answer 36

The water level in the tubing attached to the porous pot

Question 37

Why are the water levels in the tubing the same level the same at the start of the experiment

Answer 37

because the pressure in the porous pot is the same as the atmospheric pressure.

Question 38

How to tell the difference in diffusion rates of the gases

Answer 38

the water level in the tubing

Question 39

read slide 16/19 of chapt 2 pt 2

Answer 39

read slide 16/19 of chapt 2 pt 2