chemistry revision

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Across
  1. 3. ionic substances conduct electricity when aqueous or _____
  2. 6. a crystalline structure containing no water
  3. 7. increases the rate of reaction, without being used up, by providing an alternative reaction pathway with a lower activation energy
  4. 8. a sub-atomic particle which has no charge
  5. 9. a region around an atomic nucleus which can hold up to 2 electrons with opposite spins
  6. 11. atoms of the same element with a different number of neutrons and therefore different masses
  7. 13. measure of the tendency of an atom to attract a bonding pair of electrons in a covalent bond
Down
  1. 1. the shape of a molecule with 4 bonded electron pairs and no lone pairs
  2. 2. a__________ catalyst is a different physical state to the reactants
  3. 4. a______ covalent bond is a covalent bond in which a shared pair of electrons has been supplied by only one of the bonded atoms
  4. 5. a positively charged ion
  5. 10. a group of atomic orbitals with the same principal quantum number/energy level
  6. 12. the shape of a molecule with 6 bonded electron pairs and no lone pairs