Chemistry Paper 1

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Across
  1. 1. The actual ratio of atoms of each element present in a compound.
  2. 6. Particles with a diameter between 1 nm to 100 nm in size
  3. 8. A giant covalent structure which is made up of carbon atoms each of which form three covalent bonds with three other carbon atoms, forming layers of hexagonal rings which have no covalent bonds between the layers
  4. 10. A chemical reaction in which a more reactive element displaces a less reactive element from its compound
  5. 12. Mrs Floyd’s first job was working in this supermarket
  6. 13. Elements that react to form positive ions
  7. 14. The bonds present between the positive metal ions and negatively charged electrons.
  8. 15. Positively charged object composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it
  9. 16. Negatively charged subatomic particle which orbit the nucleus at various energy levels
  10. 18. The smallest part of an element that can exist
  11. 19. number The total number of protons and neutrons in the nucleus.
  12. 24. The smallest whole number ratio of atoms of each element in a compound.
  13. 25. The sport Mrs Floyd coaches
  14. 26. Compound formed of ions, held together by strong electrostatic forces.
  15. 29. The strong forces of attraction between oppositely charged ions.
  16. 30. Molecules of carbon atoms with hollow shapes.
  17. 31. An average value that takes account of the abundance of the isotopes of the element.
Down
  1. 2. The part of a polymer whose repetition would produce the complete polymer chain.
  2. 3. The forces which exist between molecules
  3. 4. The university Mrs Floyd attended
  4. 5. Atoms of the same element with the same number of protons but a different number of neutrons
  5. 7. A shared pair of electrons between two non-metals
  6. 9. A separation technique used to separate solids from liquids
  7. 11. The number of protons in the nucleus
  8. 15. The elements in Group 0 of the periodic table
  9. 17. A separation technique used to produce solid crystals from a solution by evaporating the solvent.
  10. 20. Atomic model devised after the discovery of the electron. The model suggests the atom is a ball of positive charge with negative electrons scattered through it.
  11. 21. The elements in Group 1 of the periodic table
  12. 22. The elements in Group 7 of the periodic table
  13. 23. A material which contains charged particles which are free to move to carry electrical or thermal energy
  14. 27. A giant covalent structure which is made up of carbon atoms each of which form four covalent bonds with four other carbon atoms
  15. 28. Large long-chain molecules made up of lots of small monomers joined together by covalent bonds.