1. Particle model sheet a review of year 7
New Topic
New Title
Kinetic Theory
Do now
Particle model sheet a review of year 7

2. Homework Homework – 1. Finish Draw these sentences
2. Stick in all your loose worksheets by Sunday 12th February
3 Java Lava Power

3. This lesson
State the distinguishing properties of solids, liquids and gases.
Describe the molecular structure of solids, liquids and gases.
Interpret the temperature of a gas in terms of the motion of its molecules.
Relate the properties of solids, liquids and gases to the forces and distances between molecules and to the motion of the molecules.

4. Properties of solids, liquids and gases
Make notes of the following slides

5. Solids Fixed shape and volume
Particles together by strong forces of attraction called bonds they vibrate about fixed positions
Difficult to compress
Generally dense

6. Liquids Shape has a fixed volume but can flow and change shape
The particles vibrate and can change position
Not easy to compress
Generally dense
Water to ice

7. Gases . Shape can change Particles can move freely
They move at high speed colliding with each other and the walls of their container
Easy to compress
Low density
Liquid to gas
Turbulent gases in space Red represents - sulfur;
green - hydrogen; blue - oxygen.

8. Solids, liquids and gases
States of Matter

9. Temperature- Microscopic
Temperature is a measure of the average random kinetic energy of the particles in a substance.
Note that they are not all travelling at the same speed.

10. Temperature
The hotter the temperature, the faster the average speed of the particles
Note that they are not all travelling at the same speed.

11. Draw the sentence 1. 2. 3. 4. 5. 6. 7. 8.

12. Draw these sentences!
The particles in a solid are close packed, in regular positions and vibrate around a fixed point.
The particles in a liquid are also close packed, they vibrate but can also move around randomly.
Particles in a liquid are NOT further apart than particles in a solid.
The particles in a gas are far apart and move randomly.
The particles in a gas are about 10 times further apart than in a solid or liquid
The hotter a gas is, the faster the particles move.
The particles in a solid, liquid or gas are the same size (provided it is the same substance)
Physics is the most interesting subject..

13. Draw these sentences!
The particles in a solid are close packed, in regular positions and vibrate around a fixed point.
The particles in a liquid are also close packed, they vibrate but can also move around randomly.
Particles in a liquid are NOT further apart than particles in a solid.
The particles in a gas are far apart and move randomly.
The particles in a gas are about 10 times further apart than in a solid or liquid
The hotter a gas is, the faster the particles move.
The particles in a solid, liquid or gas are the same size (provided it is the same substance)
Physics is the most interesting subject..

14. Homework Homework – 1. Finish Draw these sentences
2. Stick in all your loose worksheets by Sunday 12th February
3 Java Lava Power

15. How do we know? Next lesson in Mr Garnett’s Room SS13

16. Brownian motion
Robert Brown

17. Write down what you observed.
What did you see?
Write down what you observed.
What did you see?
How would you describe their motion?
How do you explain the motion of the smoke particles?
Brownian motion

18. What did you see?
The smoke smoke particles are observed as points of light,
their jiggling or random motion
is due to collisions with much smaller and invisible air particles.
You can see the smoke particles not the very small air particles.

19. Brownian motion – Fat droplets in milk
Brownian Motion - YouTube

20. Brownian motion is the seemingly random movement of particles suspended in a fluid (i.e. a liquid or gas). It is due to the instantaneous imbalance in the combined forces exerted by collisions of the particle with the much smaller liquid molecules surrounding it.

21. Evidence Brownian motion is evidence
the existence of atoms or molecules
and their random movement
This random motion can be modelled mathematically
This was one of Einstein’s great papers of 1905.

22. Myth Busters
Robert Brown is correctly referred to as having observed the jittering motion of small particles, but
he wasn't the first to record the observation, call Brownian motion this was by Jan Ingenhauz (photosythesis) in 1785 using charcoal dust.
he did NOT observe the motion of actual pollen grains.

23. Solids, liquids and gases
Let’s try a simulation!

24. Properties of solids, liquids and gases
Make notes of the following slides if you wish!

25. Solids
Fixed shape
Cannot flow
Difficult to compress
Generally dense

26. Liquids
Shape can change
Can flow
Not easy to compress
Generally dense

27. Gases
Shape can change
Can flow
Easy to compress
Low density