FORMULAE, REACTIONS AND MASSES

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Across
  1. 2. Amount of substance containing Avogadro’s number of particles.
  2. 6. The isotope used as the standard for atomic mass. (6,6)
  3. 7. A negatively charged ion.
  4. 9. Compound formed when magnesium reacts with oxygen. (9,5)
  5. 11. The fixed numerical relationship of atoms in a compound (e.g., KI is 1:1).
  6. 14. What non-metal atoms do with electrons when they form covalent bonds.
  7. 15. Chemical formula for magnesium oxide.
  8. 17. The number of electrons an atom uses to bond.
  9. 18. Symbol Mr; mass of a molecule compared to ¹²C/12. (8,9,4)
  10. 21. Calculating reacting amounts using balanced equations.
  11. 23. What Group 7 non-metals do to electrons to form negative ions.
  12. 24. A positively charged ion.
  13. 25. Substances you start with in a chemical reaction.
Down
  1. 1. A substance made from two or more elements chemically joined.
  2. 3. Principle stating matter cannot be created or destroyed.
  3. 4. Mr for ionic compounds with no molecules. (8,7,4)
  4. 5. The name fluorine takes when it becomes an ion or forms a compound.
  5. 8. Subatomic particle that differs between isotopes.
  6. 10. What (aq) means; dissolved in water. (7,8)
  7. 12. Relative molecular mass of water (H₂O).
  8. 13. (s), (l), (g), (aq) in chemical equations. (5,7)
  9. 16. Symbol Ar; weighted average mass of an element’s atoms. (8,6,4)
  10. 19. Atoms of the same element with different numbers of neutrons.
  11. 20. What Group 2 metals do to 2 of their electrons when bonding.
  12. 22. Substances formed at the end of a reaction.