C2 Material Choices Revision Powerpoint OCR 21st Century Science

A revision powerpoint for c3, 21st Century Science GCSE. The resources for this powerpoint were the CGP Revision guide and BBC Bitesize. The wording has been changed, interpretted and with the addition of my own notes. Hope it helps :) I put it in a form of a powerpoint because I find it easier to revise from. You can personalise it how you like- I kept it blank for people to be able to change it for what's best for them :)

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  • Created by: Ohhmy
  • Created on: 03-06-11 19:48
Preview of C2 Material Choices Revision Powerpoint OCR 21st Century Science

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Materials
· Made up of chemicals
­ Either made of individual chemicals or mixtures
· The chemicals are made up of atoms or
groups of atoms which are bonded together
­ For example, water is chemical and it's made up
of lots of water molecules
· These contain 2 chemical elements (hydrogen and
water)
­ Iron is a chemical element, made from iron atoms…read more

Slide 3

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Natural materials
· They are made by living things
· Materials from plants:
­ Wood and paper are from trees
­ Cotton comes from the cotton plant
· Materials from animals:
­ Wool comes from sheep
­ Silk is made from silkworm larva
­ Leather comes from cows…read more

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Synthetic materials
· These are man-made
· Common example- rubber:
­ Used to come from sap of the rubber tree
· Car tyres are made that way
­ You can now make it in a factory
­ The advantage- you are able to control its
properties (make it suitable for different
purposes)
­ The disadvantage- it's cheaper to use rubber from
the sap of the rubber tree…read more

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Properties of materials
Different materials have different properties:
· Melting point- the temperature where the solid
material turns to liquid
· Strength- how good the material is at resisting
force. The strength can be judged by seeing how
much force is needed for break is or deform it:
1. Tensile strength- how much a material can resist a
pulling force
2. Compressive force- how much a material can resist
a pushing force…read more

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Properties of materials
· Stiffness- this type of material is good at not bending
when a force is applied to it (not the same as strength
i.e. A bendy material can still be strong if a big force
does not permanently deform it)
· Hardness- how difficult it is to cut into the material
· Density- a material's mass per unit volume. It is not
the same as mass or weight however
­ For example, air is not very dense (you'd need a huge
volume to make up 1kg of mass)
­ Gold is very dense and therefore would need only a small
volume to make up 1kg of mass…read more

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Comments

Fatima


Sasha Dean

brilliant and easy way to learn c2

Adeel-Ali

Nice! Put effort into it

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