Particle Model Of Matter Flashcards Preview

Physics Gcse Higher 9-1 > Particle Model Of Matter > Flashcards

Flashcards in Particle Model Of Matter Deck (18):
1

Describe the particles of a liquid in terms of their energy and movement

Particles are held to close together but can move past each other they form irregular arrangements the particles move randomly at low speeds

2

What is density a measure of

Density is a measure of the amount of mass

3

How does a cooling system affect its internal energy

A cooling system decreases its internal energy

4

What is specific latent heat of vaporisation

The specific latent heat of vaporisation of a substance is the amount of energy needed to change 1Kg of that substance from a liquid to gas

5

What are the units of specific latent heat

J/Kg

6

What are three states of matter

Solid liquid gas

7

For each state of matter describe the arrangement and movement of the particles

Solid- regular arrangement very low energy particles vibrate on the spot
Liquid- irregular arrangement particles move past each other at low speeds
Gas- random arrangement high energy particles move randomly

8

What is formula for density

Mass➗volume

9

Give an example of the possible units for density

Kg/m3

10

What happens to the particles of a substance when that substance is heated

They gain kinetic energy and the particles move faster and they change state

11

Name the 6 changes of state

-freezing
-boiling
-evaporating
-condensing
-melting
-sublimating

12

Is the change of state a physical or chemical change

Physical

13

True or false mass stays the same when a substance changes state and why

True because mass is conserved

14

Explain the cause of the flat sections on a graph of temperature against time for a substance being heated

It’s when energy is being transferred for a substance to change state

15

Define specific latent heat

The amount of energy needed to change 1 kg of a substance from one state of matter to another without changing its temperature

16

What is meant by the term specific heat of fusion

Changing from a solid to liquid or melting or freezing

17

Explain how a gas in a sealed container exerts pressure on the walls of the container

Gas particles move at high speeds and bang into the walls of the container so when they bang into it they exert a force on it.
In a sealed container the outward gas pressure is the total force exerted by all the particles in the gas on a unit area of the container walls

18

A sample of gas is heated in a container with a fixed volume what happens to the pressure of the gas as it’s heated

-as the particles are travelling quicker it means they hit the sides of the container more often in a given amount of time
- each particle has a larger momentum which means they exert a larger force when they collide with the container