F334 The Materials Revolution 0.0 / 5 ? ChemistryEverythingA2/A-levelOCR Created by: HannahWedgeCreated on: 04-03-15 18:17 What's the difference between ammonia and amines? Ammonia has three hydrogen atoms bonded to a central nitrogen but amines have one of more alkyl groups substituted for hydrogen 1 of 18 The lone pair in ammonia is responsible for what three main properties? Ammonia can act as bases, nucleophiles and ligands 2 of 18 Difference between primary, secondary and tertiary amines? P: N bonded to one alkyl group. S: N bonded to two alkyl groups. T: N bonded to three alkyl groups. 3 of 18 Name CH3CH2NH2 ethylamine or aminoethane 4 of 18 Amines dissolve in water to form what? weakly alkaline solutions 5 of 18 When hydrogen atoms in amines are replaced by alkyl groups, this is called what? Alkylation 6 of 18 When amines react with acyl chlorides, what is this called? Acylation 7 of 18 What is an amide? CONH 8 of 18 Describe condensation polymerisation Two different monomers join together and a small molecule is often eliminated 9 of 18 Describe a polymer when the temperature is below its glass transition temperatyre (Tg) It's brittle and glass-like 10 of 18 What kind of polymer is nylon (polyamide)? A condensation polymer formed from diamines and dicarboxylic acids 11 of 18 What types of intermolecular bonds hold nylon chains together? Hydrogen bonds 12 of 18 What kind of polymer is a polyester? A condensation polymer made from diols and dicarboxylic acids 13 of 18 What types of intermolecular bonds hold polyester chains together? Permanent dipole - permanent dipole 14 of 18 In what two ways can you lower the Tg of a polymer? Copolymerisation and adding plasticisers 15 of 18 How can you increase the strength of a polymer? Cold drawing 16 of 18 Name 5 alternative options to putting plastics (which take a long time to decompose) in a landfill/burying them Recycling, remoulding, cracking, design degradable plastics and burning 17 of 18 What is a 'life cycle assessment'? Measures emissions during extraction of raw materials, manufacture, distribution and its eventual disposal 18 of 18
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