Reactions + oxidation

Jen
Mind Map by Jen, updated more than 1 year ago
Jen
Created by Jen almost 7 years ago
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GCSE Chemistry - UNIT 1 Mind Map on Reactions + oxidation, created by Jen on 03/31/2014.

Resource summary

Reactions + oxidation
  1. Titrations
    1. Must know conc. of one or two solutions
      1. Standard solution
        1. Use to find unknown info about substance dissolved in 2nd solution
      2. Unknown info may be
        1. Conc. of solution
          1. Molar mass
            1. Formula
              1. No. of molecules of water of crystallisation
              2. Indicators
                1. Methyl orange
                  1. Acid = red; Base = yellow; End point = orange
                  2. Bromothymol blue
                    1. Acid = yellow; Base = blue; End point = green
                    2. Phenolphthalein
                      1. Acid = colourless; Base = pink; End point = pale pink
                    3. Calculating unknowns
                      1. 1st 2 steps the same
                        1. 1) Calculate amount, in mol, of reactant
                          1. n = c x V/1000
                          2. 2) Calculate amount, in mol, of other reactant
                            1. Stoichiometry
                          3. 3rd step different
                            1. Unknown conc.
                              1. Calculate conc. of unknown
                                1. c = nx1000 / V
                                2. Unknown molar mass
                                  1. Calculate molar mass of unknown
                                    1. M = n x m
                              2. Oxidation number
                                1. Number of electrons an atom uses to bond with atoms of other elements
                                  1. Rules
                                    1. Uncombined element = 0
                                      1. Combined oxygen = -2
                                        1. When combined with fluorine = +2, in peroxides = -1
                                        2. Combined hydrogen = +1
                                          1. When bonded to metal in hydrides = -1
                                          2. Simple ion = charge on ion
                                            1. Combined fluorine = -1
                                            2. Some elements form compounds and ions in which the element has different oxidation no's
                                              1. Use Roman Numerals
                                                1. Transition elements form ions with different oxidation no's.
                                                2. Oxyanions = negative ions that contain an element with oxygen
                                                  1. End in -ate
                                                3. Redox reactions
                                                  1. Substance that is reduced takes electrons form substance that is oxidised
                                                    1. Half equations show how electrons are transferred
                                                      1. Metals = oxidised - lose electrons -> +ve ions
                                                        1. Non-metals = reduced - gain electrons -> -ve ions
                                                          1. Reduction = decrease in oxidation no. oxidation = increase
                                                            1. Metals and acids
                                                              1. Metal = oxidised -. +ve metal ions
                                                                1. Hydrogen = reduced -> hydrogen gas
                                                                  1. metal + acid -> salt + H2
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