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Across 2. Waste polymers can be ____________________ (another word for burned) to release the energy they store 5. This is the mechanism by which addition occurs across a double bond in alkenes 7. The polymers have bonds that are weakened by absorbing light 9. Bromine is ________________ when added to an alkene 10. This acid is used as a catalyst with steam to convert ethene into ethanol 12. Polymer that is used to coat pans to make them non-stick 14. These have the same structural formula but a different arrangement of the atoms in space. 15. Alkenes undergo rapid____________ reactions with halogens like chlorine or bromine at room temperature 17. biodegradable polymers are made from this substance so that they can be broken down by microorganisms . 18. Molecule with at least 1C=C 21. General formula is CnH2n 22. This is 120 around the C in C=C 25. A carbocation with 3 different groups attached is called a ____________ ion 28. Alkyl groups are electron ______________ 29. This catalyst is used to carry out an addition reaction where hydrogen is added to an alkene 30. Using the Cahn-Ingold-Prelog rules, if the groups with higher priority are on different sides of a C=C the isomer is described as a - isomer 32. The pi bond is _____________ than the sigma bond 33. Using the Cahn-Ingold-Prelog rules, if the groups with higher priority are on the same side of a C=C the isomer is described as a - isomer

Down 1. The sideways overlap of 2 p- orbitals results in the formation of this type of bond 3. The shape around the C in C=C 4. All of the atoms around the C=C are in the same __________ 6. Alkene based polymers are un-reactive, making them suitable for food storage ut as a result they are ___ - _________________ 7. The fourth electron in a C atom of a double bond is in a - orbital 8. A ________________ has a positive charge on a carbon atom 11. Hydrogen halides react with alkenes at room temperature to make ________________ 13. This type of recycling describes the chemical and thermal processes that reclaim monomers, gases or oil from polymers. 16. 3 out of the 4 electrons in a C atom of a double bond are used in this type of bond 19. The pi bond prevents ______________ around the double bond 20. PVC is hazardous due to its high _____________ content 23. The monomer for the addition polymer polythene 24. This type of carbocation is the least stable 26. the pi electron density is concentrated above and ________ the line joining the nuclei of the bonding atoms 27. The more alkyl groups attached to the positively charged C atom the more ________ the ion 31. Polymer (abbrev) used in making pipes and bottles