Keyword crossword - Chemistry

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Across
  1. 5. the number (6.02 × 1023)
  2. 9. compounds formed between an element and a halogen, e.g. sodium iodide
  3. 11. a white solid known chemically as calcium oxide
  4. 13. a substance that dissolves in water, producing H+(aq) ions
  5. 14. the process of forming crystals from a saturated solution
  6. 17. a method of rust protection by attachment of blocks of a metal
  7. 18. protein molecules that act as biological catalysts
  8. 22. if two liquids form a completely uniform mixture when added together
  9. 23. a black, solid fossil fuel formed underground
  10. 25. the major ore of iron, iron(III) oxide
  11. 29. an uncharged subatomic particle present in the nuclei of atoms
  12. 30. the electrode in any type of cell at which oxidation
  13. 36. fertilisers to provide the elements nitrogen, phosphorus and potassium
  14. 39. a formula for a compound which shows the simplest ratio of atoms present
  15. 40. term that describes a liquid that evaporates easily;
  16. 42. mixtures of elements (usually metals)
  17. 43. expresses the relationship between the mass of a substance and the volume it occupies:
  18. 45. the energy required to break a particular type of covalent bond
  19. 46. the change of a vapour or a gas into a liquid;
  20. 47. the industrial manufacture of sulfuric acid using the raw materials sulfur and air
  21. 49. the chemical process by which plants synthesise glucose from atmospheric carbon dioxide and water
  22. 50. a word to describe a metallic substance that rings like a bell when hit with a hammer
Down
  1. 1. an acid–base indicator that is colourless in acidic solutions and blue in alkaline solutions
  2. 2. the ability to conduct heat
  3. 3. term that describes substances that do not produce a chemical reaction
  4. 4. a substance added to the soil to replace essential elements lost when crops are harvested,
  5. 6. the minimum energy required to start a chemical reaction
  6. 7. the protection of iron and steel objects by coating with a layer of zinc
  7. 8. sodium aluminium fluoride
  8. 10. a substance which changes colour when added to acidic or alkaline solutions,
  9. 12. a molten mixture of impurities, mainly calcium silicate, formed in the blast furnace
  10. 15. the separation of a solid from a liquid
  11. 16. the number of the vertical column that an element is in on the Periodic Table
  12. 19. an alloy of copper and zinc
  13. 20. the direct change of state from solid to gas or gas to solid: the liquid phase is bypassed
  14. 21. a substance that increases the rate of a chemical reaction
  15. 24. oxide of a metal that will react with acids to neutralise the acid
  16. 26. an insoluble salt formed during a precipitation reaction
  17. 27. an acid–base indicator that is red in acidic and yellow in alkaline solutions
  18. 28. ionic equations showing the reactions at the anode and cathode in an electrolytic cell
  19. 29. elements in Group VIII
  20. 31. a process or chemical reaction in which heat energy is produced
  21. 32. element which shows some of the properties of metals and some of non-metals,
  22. 33. a substance which oxidises another substance during a redox reaction
  23. 34. the central region of an atom
  24. 35. a corrosive substance (e.g. an acid) is one that can dissolve or ‘eat away’ at other materials
  25. 37. scale: a scale running from below 0 to 14
  26. 38. a loose, orange–brown, flaky layer of hydrated iron(III) oxide
  27. 41. anything that occupies space and has mass
  28. 44. a chemical reaction in which water is removed from a compound
  29. 48. an adjective to describe a substance without water combined with it