Compounds, formulae and Equations

• what are ionic compounds formed form ? and what charge do they have ?

  • Ionic compounds are formed from a metal and a non-metal bonded together
  • Ionic compounds are electrically neutral; the positive charges equal the negative charges
• all metals form '' ions

  positive
• what are used to indicate the charge on a transition metal and why ?

  roman numerals because the charge on ions of the transition elements can vary
• non metals in group 15 to 17 have a '' charge and have the sufficient ''

  negative

  ide
• What are polyatomic negative ions ?

  which are negative ions made up of more than one type of atom
• what is the formulae of these common ionic compounds ?

  silver I

  Ammonium

  Zinc III

  Hydroxide

  Nitrate

  Sulphate

  Carbonate

  Hydrogen Carbonate

  Phosphate 


  see picture

  
• what is a symbol equation and a word equation ?

  • A symbol equation is a shorthand way of describing a chemical reaction using chemical symbols to show the number and type of each atom in the reactants and products
  • A word equation is a longer way of describing a chemical reaction using only words to show the reactants and products
• in what order to you balance elements in an equation ?

  balance firstly the carbon, then the hydrogen and finally the oxygen in combustion reactions of organic compounds
• what does an ionic equation show ?

  An ionic equation shows only the ions or other particles taking part in a reaction, and not the spectator ions
• what are spectator ions ?

  The ions that do not take part in the reaction