AQA GCSE Chemistry - Synthetic and Naturally Occurring Polymers PDF

AQA​ ​GCSE​ ​Chemistry Topic​ ​7:​ ​Organic​ ​chemistry ​ ​Synthetic​ ​and​ ​naturally​ ​occurring​ ​polymers​ ​(chemistry only) Notes (Content​ ​in​ ​bold​ ​is​ ​for​ ​Higher​ ​Tier​ ​only)...

AQA​ ​GCSE​ ​Chemistry Topic​ ​7:​ ​Organic​ ​chemistry ​ ​Synthetic​ ​and​ ​naturally​ ​occurring​ ​polymers​ ​(chemistry only) Notes (Content​ ​in​ ​bold​ ​is​ ​for​ ​Higher​ ​Tier​ ​only) www.pmt.education Addition​ ​polymerisation Alkenes​ ​can​ ​be​ ​used​ ​to​ ​make​ ​polymers​ ​such​ ​as​ ​poly(ethene)​ ​and​ ​poly(propene) by​ ​addition​ ​polymerisation.​ ​In​ ​this​ ​reaction,​ ​many​ ​small​ ​molecules​ ​(monomers) join​ ​together​ ​to​ ​create​ ​very​ ​large​ ​molecules​ ​(polymers).​ ​For​ ​example: The​ ​repeat​ ​unit​ ​has​ ​the​ ​same​ ​atoms​ ​as​ ​the​ ​monomer​ ​because​ ​no​ ​other​ ​molecule is​ ​formed​ ​in​ ​the​ ​reaction when​ ​you​ ​draw​ ​out​ ​a​ ​polymer​ ​make​ ​sure​ ​than​ ​you​ ​remember​ ​to​ ​draw​ ​the​​ ​bonds coming​ ​off​ ​the​ ​C’s​ ​out​ ​the​ ​brackets​ ​and​​ ​the​ ​little​ ​‘n’​​ ​(means​ ​there​ ​are​ ​large numbers​ ​of​ ​these​ ​molecules​ ​joined​ ​together) Condensation​ ​polymerisation Involves​ ​monomers​ ​with​ ​two​ ​functional​ ​groups o When​ ​they​ ​react,​ ​they​ ​join​ ​together,​ ​usually​ ​losing​ ​small​ ​molecules​ ​such as​ ​water,​ ​and​ ​so​ ​the​ ​reactions​ ​are​ ​called​ ​condensation​ ​reactions o Simplest​ ​polymers​ ​are​ ​produced​ ​from​ ​two​ ​different​ ​monomers​ ​with two​ ​of​ ​the​ ​same​ ​functional​ ​groups​ ​on​ ​each​ ​monomer E.g.​ ​this​ ​polyester​ ​has​ ​1​ ​monomer​ ​with​ ​2​ ​carboxylic​ ​acid​ ​functional​ ​groups​ ​and​ ​1 monomer​ ​with​ ​2​ ​alcohol​ ​functional​ ​groups: Amino​ ​acids They​ ​have​ ​two​ ​different​ ​functional​ ​groups​ ​in​ ​a​ ​molecule​ ​(an​ ​amine​ ​group​ ​and​ ​a carboxylic​ ​acid​ ​group) They​ ​react​ ​by​ ​condensation​ ​polymerisation​ ​to​ ​produce​ ​polypeptides​ ​(works​ ​the same​ ​as​ ​the​ ​polyester​ ​above​ ​just​ ​has​ ​different​ ​functional​ ​groups) Different​ ​amino​ ​acids​ ​can​ ​be​ ​combined​ ​in​ ​the​ ​same​ ​chain​ ​to​ ​produce​ ​proteins www.pmt.education DNA​ ​(deoxyribonucleic​ ​acid)​ ​and​ ​other​ ​naturally​ ​occurring polymers DNA​ ​is​ ​a​ ​large​ ​molecule​ ​essential​ ​for​ ​life-​ ​it​ ​encodes​ ​genetic​ ​instructions​ ​for​ ​the development​ ​and​ ​functioning​ ​of​ ​living​ ​organisms​ ​and​ ​viruses Most​ ​molecules​ ​are​ ​two​ ​polymer​ ​chains,​ ​made​ ​from​ ​four​ ​different​ ​monomers called​ ​nucleotides,​ ​in​ ​the​ ​form​ ​of​ ​a​ ​double​ ​helix Other​ ​naturally​ ​occurring​ ​polymers​ ​important​ ​for​ ​life… o Proteins​ ​(monomer=​ ​amino​ ​acid),​ ​starch​ ​(monomer=​ ​glucose)​ ​and cellulose​ ​(monomer=​ ​glucose) www.pmt.education