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CHEMISTRY C1 C2 C3…read more

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Slide 3

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C1
Perfumes need certain properties...
Easily Evaporates ­ So the perfume particles
can reach the nose
Non- Toxic ­ so it doesn't poison you
Doesn't react with water ­ so it doesn't react
with the water in your sweat
Doesn't irritate the skin ­ so you don't get a
rash/burn
Insoluble in water ­ so it doesn't wash off
every time you get wet…read more

Slide 4

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Mass and atomic number
Particle Relative Mass Relative Charge
Proton 1 1
Neutron 1 0
Electron 0 -1
NUMBER OF ELECTRONS IN
OUTER SHELLS (ELECTRON
CONFIGURATION)
PROTON NUMBER = number of
protons (obviously)
SYMBOL
MASS NUMBER = number of
protons + number of neutrons
number of electrons = number of protons…read more

Slide 5

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Paints and Pigments
Pigments ­ give paints their colour
Binding medium ­ liquid that carries the pigment parts and holds them together
Solvent ­ thins the paint to make it easier to spread
Colloids
· A colloid consists of really tiny particles of one kind of substance mixed into another
substance.
· The particles can be bits of solids, droplets of liquids or bubbles of gas.
· Colloids don't separate out because the particles are so small they don't settle at the
bottom.
· A PAINT IS A COLLOID where particles of the pigment (usually a solid) are dispersed
through a liquid.
Oil paint dries in two different stages:
1) The solvent evaporates
2) The oil is oxidised by oxygen in the air before it turns to a solid
Thermochromic Pigments ­ change colour when heated
Phosphorescent Pigments ­ glow in the dark…read more

Slide 6

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Polymers
· Plastics are long chain molecules called polymers
· They need pressure and a catalyst to be made
· The forces between the molecules determine the properties of the
plastic;
- Weak Forces: if the plastic is made up of long chains that are held
together by weak intermolecular forces then the chains will be free
to slide over each other. This means that plastic can be stretched
easily and will have a low boiling point
-Strong Forces: some plastics have stronger between the polymer
chains , these might be covalent bonds between the chains or cross-
linking bridges. These plastics higher melting points are rigid and can'
t be stretched as the crosslink's hold the chains firmly together.…read more

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Comments

Unicorns.Exist

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LIFE SAVER

Caitlin Ward

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THIS IS AMAZING!! THANK YOU!!!

hanz1999

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is this ocr gateway??????? 

jakecooper

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thanks

Iram.K

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THIS IS AMAZING. THANK YOU SO MUCH. I am actually so indebted to you... LIFE SAVER 

aswakhan03

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Fabulous resource. THANK YOU

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is this OCR gateway?

Makaydah

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OCR??

Hxneul._.Chan

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Perfect for OCR Gateway? Great to secure that A* ?

rajveja

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is this ocr 21st century ?

RWhite3

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brilliant

eminkinza

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which exam board is it for : aqa , edexcel or ocr????

imgonnafaileverythinghaha

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chem exam today, really hope this scrapes me  a C at least 

Aliyahz.

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THANK YOU!!! :)

Bushra Patel

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freaking life saver ohmygod. 

This has everything for OCR, That's for sure, and judging by that, I reckon it's good for all the other exams too. I know that AQA don't have more than 3 series anyway, at least 2016's AQA GCSE students didn't. Still, I beleieve this was intended and made based on OCR syllabuses... that should be good for all the other board's right? 

RaulLobo25

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ty

Anon861

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This is a literal copy from the CGP textbook, but it's helpful to those who don't have access to it. This is OCR Gateway, for anyone confused.

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