C2 0.0 / 5 ? ChemistryC2GCSEOCR Created by: cookiealfiepatchCreated on: 12-05-16 15:30 what are the 2 types of materials? natural and synthetic 1 of 13 what is crude oil made of? a mixture of hydrocarbons 2 of 13 how is crude oil separated? fractional distillation - evapourating the mixture and separating the chains based on their length and boiling point 3 of 13 what jobs do the fractions have? petrol, kerosene and bitumen (lots more) 4 of 13 what determines somethings boiling point? it is the energy needed to break the inter molecular forces between the molecules (the longer the chain, the bigger inter molecular force) 5 of 13 what is polymerisation? the process where monomers join to make polymers 6 of 13 humans make polymers because... you can change the property's of a material 7 of 13 what do cross-links do? they are strong covalent bonds between molecules that make molecules stiff and soild 8 of 13 what are plasticizers/ molecules between polymer chains which make materials more dense 9 of 13 what is crystalline? it is when the chains of a polymer are closer together making materials more dense/strong due to the extra inter molecular forces 10 of 13 what is a nanometre? one millionth of a millimetre 11 of 13 what are nanoscale particals and how do they occur? they occur naturally (sea spray), or are made accidentall/on purpose by humans. they are used to modify the properties of materials. 12 of 13 you are some people concerned about nano particles? because they are not fully tested and could lead to health problems 13 of 13
Comments
No comments have yet been made