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This is a chemical recipe for the decomposition of water by electrolysis.

reactants. Is this true for the decomposition of water by electrolysis?. This is a chemical recipe for the decomposition of water by electrolysis. products. What did John Dalton in 1808 have to say about chemical reactions?.

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This is a chemical recipe for the decomposition of water by electrolysis.

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  1. reactants Is this true for the decomposition of water by electrolysis? This is a chemical recipe for the decomposition of water by electrolysis. products What did John Dalton in 1808 have to say about chemical reactions? 1. Chemical reactions involve just the simple rearrangement of atoms. 2. Atoms are conserved in a chemical reaction. In other words, atoms are not created nor destroyed in chemical reaction.

  2. 1. Chemical reactions involve just the simple rearrangement of atoms. 2. Atoms are conserved in a chemical reaction. In other words, atoms are not created nor destroyed in chemical reaction. This ture for the above decomposition of water by electrolysis. 4 hydrogen atoms 4 hydrogen atoms 2 oxygen atoms 2 oxygen atoms Let’s see if John Dalton had assumed correctly.

  3. iron metal chlorine gas forms> iron (II) chloride plus 1 1 Oxidation OIL Reduction RIG Feo Fe 2+ + 2e- Cl2o + 2e- 2Cl – Fe(s) + Cl2(g) FeCl2 (s) Fe 2+ Cl – Cl – Combination - Synthesis (the REDOX process defined) 1 1 1 Analyzing the half reactions

  4. Combination - Synthesis (the REDOX process defined) iron metal chlorine gas forms iron (II) chloride 1 1 1 Analyzing the half reactions Oxidation OIL Reduction RIG Cl2o + 2e- 2Cl – Feo Fe 2+ + 2e- Fe(s) + Cl2(g) FeCl2 (s) the electrons on the reactant side cancel the electrons on the product side Fe 2+ Cl – Cl – 1 1 1 1 combining both half reactions 1 Fe(s) + 1 Cl2(g) 1 FeCl2 (s)

  5. Mgo lost electrons (s) (s) (g) magnesium metal solid oxygen gas magnesium oxide solid ionic salt Oxygen gained electrons Mg O Mg 2+ O2O O2– What reactant was oxidized? What reactant was reduced?

  6. Iron metal lost electrons (s) 4 3 2 iron metal solid (g) (s) oxygen gas iron (III) oxide solid TM ionic salt Oxygen gained electrons Fe 3+ Fe 3+ Fe O O2– O2– O2– O2O What reactant was oxidized? What reactant was reduced?

  7. CH4O + O2 CO2 + H2O CH4O + O2 CO2 + H2O 2x C2H6O + O2 CO2 + H2O 2 2 4 3 CH2O + O2 CO2 + H2O o C 4+ O2– O2– Combustion of methanol, CH4O Don’t leave as a fraction, multiply through by 2 combustion 3 __ 2 1 1 2 Combustion of ethanol, C2H4O 1 3 2 3 Combustion of formaldehyde, CH2O 1 1 1 1 What reactant was oxidized? What reactant was reduced?

  8. ? 6 Now solve for “?” 6+ ? • 2 = 18 2 2 -6 -6 ? • 2 = 12 Divide each side by 2 ? = 6 Now balance the combustion of glucose (blood sugar) 1 6 6 1 • O2 + 6 • 1O Always balance oxygens last 12 + 6 = 18 1•O6 + ? • O2 = 18 Substract 6 from each side

  9. chlorophyll catalyst CO2 + H2O C6H12O6 + O2 Combination - Synthesis - PHOTOSYNTHESIS 6 6 1 6

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