Particle Model (paper2)

Question 1

What is sublimation

Answer 1

When a solid goes straight to a gas

Question 2

What is the kinetic theory

Answer 2

Where everything is made up of particles

Question 3

Why can solids not be compressed

Answer 3

The particles are free to vibrate but not move

Question 4

Why are liquids not in a fixed position

Answer 4

The particles are moving faster so the weaker forces of attraction can’t keep them in a fixed position

Question 5

Why can’t liquids be compressed

Answer 5

As the particles are still very close

Question 6

What happens to the mass during a change of state

Answer 6

It is conserved as the number of particles stays the same

Question 7

Out of physical and chemical changes, which cannot be reversed

Answer 7

Chemical changes

Question 8

What is density

Answer 8

The mass of a certain volume of that substance

Question 9

When are most substances most dense

Answer 9

When a solid, and least when a gas

Question 10

Why are solids usually denser

Answer 10

The particles are closer together

Question 11

When a solid stores more thermal energy how does its particles react

Answer 11

They vibrate more

Question 12

What is temperature

Answer 12

The measurement of the vibration of particles

Question 13

The amount of thermal energy stored depends on three things

Answer 13

Mass
Temp
Material

Question 14

What is the specific heat capacity of a material

Answer 14

Th amount of energy it takes to increase 1kg of that material by 1 degree

Question 15

What do the flat parts of heating graphs show

Answer 15

That heat is still being applied but the extra energy is being used to overcome bonds

Question 16

What is specific latent heat

Answer 16

The amount of energy needed to change state of 1kg of a substance

Question 17

What energy is given out when something freezes or condenses

Answer 17

The same as the specific latent heat

Question 18

What is the temp of a gas a measure of

Answer 18

Its average kinetic energy

Question 19

Heating a gas increases what

Answer 19

It’s kinetic energy, so the particles move faster and the temp rises

Question 20

What is the pressure of a gas due to

Answer 20

Forces on the walls of its container caused by the moving particles hitting the walls

Question 21

The faster the particles are moving, the what

Answer 21

The more frequent the collisions will be and the higher the force they exert when they collide

Question 22

What is the units of pressure

Answer 22

Pascals

Question 23

What is absolute zero

Answer 23

Minus 273

Question 24

What would happen to a gas if it could be made absolute zero

Answer 24

It’s pressure would be 0 and it’s particles wouldn’t be moving

Question 25

What is a scale that measure temp relative to absolute zero

Answer 25

The kelvin temp scale

Question 26

How to you convert from kelvin to degrees

Answer 26

Minus 273

Question 27

The average kinetic energy of a gas is directly proportional to what

Answer 27

The kelvin temperature of the gas

Question 28

What is the effect if gas particles hitting a surface

Answer 28

It’s causes an overall net force on the surface

Question 29

Inside a container, what degrees do gas particles hit the surface at

Answer 29

90°

Question 30

How many forces does it take bend, stretch or compress an object

Answer 30

More than one

Question 31

Define elastic

Answer 31

Once forces are removed it can move back to its original shape

Question 32

What does inelastic mean

Answer 32

It will keep its new shape once forces are removed

Question 33

Can objects be both inelastic and elastic

Answer 33

Yes if the forces are small enough they are elastic but if the forces are too big it can become inelastic

Question 34

Name a material that can be both

Answer 34

Metals eg springs

Question 35

What is the extension of a spring

Answer 35

The change in length when forces are applied

Question 36

For a metal spring, what is the relationship between force and length

Answer 36

Linear

Question 37

When does the relationship become non linear

Answer 37

When the spring is stretched too far

Question 38

Name another object that has a non linear relationship

Answer 38

Rubber bands

Question 39

What is the spring constant

Answer 39

The force needed to produce the extension of one metre in a spring

Question 40

What is work done

Answer 40

Energy transferred when a force moves through a distance

Question 41

What is pressure

Answer 41

The measure of the force on a unit of surface area when the force is normal

Question 42

What can pressure also be exerted by

Answer 42

Fluids like gas and liquids

Question 43

What is atmospheric pressure

Answer 43

The pressure on you from the air

Question 44

What does the pressure exerted by a fluid depend on

Answer 44

The depth of the fluid

Question 45

The deeper you are, the what

Answer 45

More weight of fluid to exert pressure on you

Question 46

What does pressure also depend on

Answer 46

The density

Question 47

Objects in a fluid have what force acting on them

Answer 47

Upthrust

Question 48

What is upthrust due to

Answer 48

The difference in pressure above and below the object