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