13/11/2018 Chemistry in Action Mr Ronesh British School in Baku.

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Presentation transcript:

13/11/2018 Chemistry in Action Mr Ronesh British School in Baku

Simple formulae to learn 13/11/2018 Covalent formulae Ionic formulae H2O CO2 NH3 H2 O2 N2 SO2 Water Carbon dioxide Ammonia Hydrogen Oxygen Nitrogen Sulphur dioxide NaCl CaCl2 MgO HCl H2SO4 HNO3 NaOH Ca(OH)2 CaCO3 Al2O3 Fe2O3 Sodium chloride Calcium chloride Magnesium oxide Hydrochloric acid Sulphuric acid Nitric acid Sodium hydroxide Calcium hydroxide Calcium carbonate Aluminium oxide Iron oxide

Some more obvious ones: 13/11/2018 Some more obvious ones: Sulphur Chlorine Argon S Cl Ar 18) Calcium 19) Zinc Ca Zn The less obvious ones: Sodium Potassium Iron Copper Silver Na K Fe Cu Ag 6) Tin 7) Gold 8) Mercury 9) Lead Sn Au Hg Pb

Sodium + water sodium hydroxide + hydrogen Balancing equations 13/11/2018 Consider the following reaction: Sodium + water sodium hydroxide + hydrogen Na + H2O NaOH + H2 Na O H O H Na + H + This equation doesn’t balance – there are 2 hydrogen atoms on the left hand side (the “reactants” and 3 on the right hand side (the “products”)

Balancing equations We need to balance the equation: 13/11/2018 We need to balance the equation: Sodium + water sodium hydroxide + hydrogen Na O H O H Na O H Na O H + H + Na Now the equation is balanced, and we can write it as: 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)

Some examples 2 2 3 2 3 Mg + O2 Zn + HCl Fe + Cl2 NaOH + HCl CH4 + O2 13/11/2018 2 2 3 2 3 Mg + O2 Zn + HCl Fe + Cl2 NaOH + HCl CH4 + O2 Ca + H2O NaOH + H2SO4 CH3OH + O2 MgO ZnCl2 + H2 FeCl3 NaCl + H2O CO2 + H2O Ca(OH)2 + H2 Na2SO4 + H2O 2 2 4