OCR 21st Century Science A C1 C2 C3 Revision Notes

This is a word document containing notes given to me by a friend. They were quite useful for my revision in year 10 as they contain things which are relevant to the course.

They can also be used as flashcards if they are printed out.

Hope you find them helpful :)

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  • Created by: hajtastic
  • Created on: 14-02-14 16:25

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Science C1,2,3

Chemistry 1: Air Quality
Unit 1.1: The changing air around us (Pg. 23)

Air composition: (Dry air)
78% : Nitrogen
21% : Oxygen
1% : Argon and small volumes of other gases

Clouds are made up of water or ice.
Dust are made up of solids, they are…

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Correlation: Link between a factor and an outcome.

Unit 1.3: Burning fuels

Oxygen is needed for any fuel to burn and release energy.

Hydrocarbons = Fossil fuels.
Only contain carbon & hydrogen.

When hydrocarbons burn:
Hydrocarbon fuel + Oxygen Carbon dioxide + Water (+ Energy)

Oxidation: When oxygen is added…

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Dissolves in rain water/oceans (CO2)

Mean = A good estimate of true value
Range = Difference between high and low result
Removing outliers could lead to mistakes.

Unit 1.5: Improving power stations and transport

Improving power stations:
Removing electricity
Turning things off, not standby
Burning less
Removing sulphur from oil…

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Stiffness is the force needed to bend a material
Hardness is how well a material stands up to wear. Compared by scratching two materials together
Density is the mass of a given volume of material. Compares how heavy something is for its size.

Density is mass per unit volume. (g/cm^3)…

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A polymer is made by a process called polymerisation.
Ethene is a monomer used to make polyethene.

Material choice will depend on comparing properties for different jobs, with cost being a factor.

Unit 1.4: Polymers: properties and improvements

Small forces attract molecules to each other.
The forces are strongest when…

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1,000 millimetres = 1m so, 1mm = 1 x 10^3m
1,000,000 micrometres = 1m so, 1 µm = 1 x 10^6m
1,000,000,000 nanometres = 1m so, 1nm = 1 x 10^9m

Unit 1.6: The use and safety of nanoparticles

Silver nanoparticles are very good at killing bacteria. They can be…

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Limestone formed while Britain was covered in sea:
Shellfish died forming sediments on the sea bed.
Sediments compacted and hardened to form limestone, a sedimentary rock.
Tectonic plate movements pushed the rock to the surface
Gradually the rocks above were eroded away until the limestone was exposed.

Coal formed in…

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Alkalis = Greater than 7, Blue or Violet pH colour
They are soluble metal hydroxides or carbonates.

Metal hydroxide/carbonates are normally insoluble bases.

Hydroxide + Acid Salt + Water
Carbonates + Acid Salt + Water + Carbon dioxide

Unit 1.4: Electrolysis

Electrolysis breaks up compounds using electricity.
The electrolysis of…

Comments

Faridae

AMAZING THANK YOU :)

aria-

These are great!! :D

lxcy_15

These are so helpful, I have my exams soon and this is a life saver!

Pete Langley - Get Revising founder

Excellent notes

TheLastChicken

#Niceshirt

katiesmith2000

Omg, this is a life saver since I have my GSCHE's in the next 2 weeks!

Harmen Gill

mine is tomorrow

akamara2000

THANK YOU SO MUCH!!!

444ffff

this was great help !!!!! is there one for p1 p2 p3 ?

Nana K

Lifesaver thank youuuu!

mrbone

omg amazin

fruitninja

nice

Thatsunnobodyknowsthenameoffromteletubbies

Great notes. Didn't even look at them.

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Shr£k

Agreed

Shr£k

I have an onion for you keemy ;)

Keemstar

Shrek, I can't wait to report your tragedy, I mean seriously man, what is up with you?

Shr£k

your not fast BOIIIIIIII

Keemstar

Look on my channel in 1 hour.

Shr£k

Weakling

Thatsunnobodyknowsthenameoffromteletubbies

Wow, I can't believe a GOD such as that is speaking to you, you are lucky Keemy

ArranEvison

these are pretty good I mean ive seen better but for the time being they'll have to do

Condog_nerd

Yes Boys

Roziesmith

trully helpful

Yusuf09

dead

mccracken

am i the only one who has only just started revising?

charlie._scott

my gces r in 2 weeks and tbf i dont care 

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