Chemistry IGCSE

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Across
  1. 3. making alcohol industrially, H2O is added across an alkene's C=C bond
  2. 6. ore of aluminium
  3. 7. adding hydrogen across an alkene's C=C bond
  4. 9. added to blast furnace to remove impurities
  5. 13. alcohol with six carbons
  6. 17. positive ion
  7. 18. smallest division on a measurement scale
  8. 20. changes colour based on pH
  9. 21. re-lights a glowing splint
  10. 23. the building blocks of a polymer
  11. 24. the fraction at the bottom of the fractioning column
  12. 25. waste product from blast furnace
  13. 26. polymer formed from di-ol and di-carboxylic acid
  14. 27. forms a cream precipitate when added to acidified silver nitrate
  15. 28. a variable that is changed during the experiment
  16. 29. forms a white precipitate that redissolves in excess NaOH
  17. 30. polymer formed from a di-amine and di-carboxylic acid
Down
  1. 1. polymer made from CH2=CHCL
  2. 2. breaking a long chain into a short chain
  3. 4. amino acid polymer
  4. 5. a substance left behind on the filter paper
  5. 8. ratio of distanced travelled by a substance and solvent
  6. 10. slow natural method of making alcohol
  7. 11. burns with an orange red flame
  8. 12. the bottom of the water level in a container
  9. 14. adjusting equipment for accuracy using an object of known value
  10. 15. separating two liquids
  11. 16. ore of iron
  12. 19. a group of compounds with similar chemical properties
  13. 22. reduces melting point of aluminium oxide