1. Y9 science revision

2. Topic check list Respiration Photosynthesis/plants as food
Rock cycle/rocks and weathering
Environmental chemistry/using chemistry
Energy & electricity
Speeding up
Pressure & moments
Gravity & space project

3. resources There are links to useful revision resources on VLE.
Log onto mypershore and select science folder/KS3/Y9revision. These can be accessed at home via the internet.
Don’t forget BBC Bitesize KS3 science – but remember the topics are not exactly the same as on the KS3 syllabus

4. The content you need to learn/revise
Key words & ideas

5. Energy for life
Respiration – all living things need energy. This is the process where energy is released by cells and used for all the cells reactions (metabolism) e.g. growth, movement
Word equation for aerobic respiration – needs oxygen
Word equation for anaerobic respiration – does not use oxygen

6. Round & round
The lungs absorb oxygen/remove carbon dioxide from the blood.
This is called gas exchange.
The circulation system transports materials to/from the cells in the blood.
This includes supplying cells with oxygen and removing carbon dioxide.

7. A light reaction What do plants need to make food?
This can be summarised in a word equation
Light is the energy for this process
Leaves are adapted to carry out photosynthesis
Roots absorb water & minerals from the soil
Don’t forget plants respire too
Plants are the basis of the food chain

8. Using chemistry Types of soil
Acid rain – how to measure using pH scale
Air pollution also causes global warming
Burning fuels/combustion
Common materials are made by chemical reactions

9. Rocky business Types of rock and how they are formed Sedimentary
Igneous
Metamorphic
What are rocks made of – grains or crystals?
Properties of rocks affect their uses as building materials

10. Rock on Weathering can be Physical – heat, freeze/thaw
Chemical – usually rainwater
Biological – plant roots
Sediments can be transported by wind or water and deposited.
These are major forces in land formation.

11. Energy & electricity Energy in action
Heat, light, sound, electrical, kinetic/movement
Stored energy – potential energy
Chemical, gravitational, strain, nuclear
Units = Joule
Energy changes from one form to another and is shown in a diagram

12. Energy & electricity
Voltage(v) - ‘pushes’ electrons around the circuit Energy can be stored and transported in cells/batteries Electricity in the home is generated in power stations and supplied via the National Grid

13. Gravity & space Gravity: Causes weight – the force on an object (N)
Acts down but is different on different planets
Gravity also changes with distance
It affects all objects including the planets
Our current model of the solar system is different from earlier ideas.

14. Need for speed Speed = distance divided by time Units = m/s or km/h
Different forces can act on an object
Friction/drag = air or water resistance
Gravity
Acceleration = change in speed

15. Under pressure
The force on a certain area Units = Newtons per square centimetre or per square meter (1N/m2 = 1 Pa) Pressure in water increases with depth Pressure in air decreases with altitude/hight Hydraulic systems are based on transmitting pressure through liquids Pneumatic systems have air under pressure e.g. tyres

16. Moments
The turning effect of a force It is calculated using moment = force x distance from pivot The units are Nm Pivot is the point around which something turns Lever is a simple machine to alter the size of a force Equilibrium = balance; the clockwise moment = anticlockwise moment

17. Use & application of knowledge
Using the information in the question; working it out on the day
Use & application of knowledge

18. Can you? Finish off a graph – by adding points/trend line
Read information from a graph
Describe trend in a graph
Pick out data in a table
Work out simple sum
Use the formulae for pressure, speed, moments?

19. investigations What is a fair test? What are variables?
What can you do to make data more reliable?

20. Good luck