C2- Material Choices OCR 21st century 4.0 / 5 based on 1 rating ? ChemistryC2- Material ChoicesGCSEOCR Created by: Liem Mao-TranCreated on: 28-03-16 15:06 What are materials made up from? Chemicals. 1 of 23 What is meant by synthetic? It is made by humans. 2 of 23 What is an advantage of synthetic material? You can control its properties. 3 of 23 What is meant by natural? Material that directly comes from other living things. 4 of 23 What is a melting point? The temperature that a solid material becomes a liquid. 5 of 23 What is meant by strength? How good a material resists a force and how much force is required to break it. 6 of 23 What is meant by stiffness? If the material is good at bending or not. 7 of 23 What is meant by hardness? How difficult a material is to cut into. 8 of 23 What is meant by density? A materials mass per unit volume. 9 of 23 What atoms does crude oil contain? Hydrogen and carbon. 10 of 23 What is a hydrocarbon? Molecules that are made from only hydrogen and carbon atoms. 11 of 23 What does crude oil have? A mixture of hydrocarbons. 12 of 23 How is crude oil separated? Through fractional distillation. 13 of 23 What materials are at the top of the crude oil fractions? Refinery gas, peterol. 14 of 23 What is the difference between the top and bottom fractions? The length, the boiling points. 15 of 23 What is a polymer? Man-made materials. 16 of 23 What is polymerisation? Loads of small molecules linked together. 17 of 23 How are plastics formed? When small molecules called monomers join together. 18 of 23 What are the properties of a polymer with weak forces? It is free to slide over each other, they can strech easily and have a low melting point. 19 of 23 What are the properties of a polymer with strong forces? They have high melting points, can't be easily stretched and have crosslinks holding chains firmly together. 20 of 23 What is the nanoparticle range? 1-100nm 21 of 23 What are the dangers of nanoparticles? They may lurch into human tissue causing health issues. 22 of 23 Why are the health effects on nanoparticles unknown? It is a new technology. 23 of 23
Chemistry C7 Notes Completed + Highlighted (Excess) - OCR 21st Century, 2011 Specification 5.0 / 5 based on 1 rating Teacher recommended
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