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Types Of Reaction 1
 

Types Of Reaction 1

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First part of lesson on on types of reaction. Suitable for upper secondary students. Best view with Powerpoint 2003 or later.

First part of lesson on on types of reaction. Suitable for upper secondary students. Best view with Powerpoint 2003 or later.

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    Types Of Reaction 1 Types Of Reaction 1 Presentation Transcript

    • TYPES OF REACTION
      • Neutralisation or Acid-Base
      • Precipitation
      • Redox
      Suitable for Upper Secondary Students Author: Toh Chui Hoon
    • NEUTRALISATION
      • A reaction between an acid and a base .
      • In this reaction, the acid donates a hydrogen ion (H + or proton) to the base leading to formation of water .
      • Examples of base : Oxides, Hydroxides and Carbonates
      • Examples of acid : Hydrochloric acid, Sulphuric acid and Nitric acid
    • Examples of Neutralisation
      • Acid + Oxide
      • 2HCl + Cu O  CuCl 2 + H 2 O
      • Acid + Hydroxide
      • H 2 SO 4 + 2Na OH  Na 2 SO 4 + 2H 2 O
      • Acid + Carbonate
      • 2HNO 3 + Ca CO 3  Ca(NO 3 ) 2 + H 2 O + CO 2
      Gives a H + to O 2- of CuO to form H 2 O
    • QUIZ
      • Which of the following basic ions can be identified using products from acid-base reaction?
      • A : OH - B : O 2- C : CO 3 2- D : Cl -
      ANSWER : Yes, it is C . When acid is added to carbonates, bubbling or effervescence can be seen due to production of CO 2 gas which will turn limewater, Ca(OH) 2 , cloudy. This is caused by production of CaCO 3 as a result of acid-base reaction between aqueous CO 2 and Ca(OH) 2 . Ca(OH) 2 + CO 2  CaCO 3 + H 2 O Hint: There must visible change in the reaction.
    • PRECIPITATION
      • This reaction involves 2 water-soluble compounds leading to formation of a water-insoluble compound .
      • Examples of water-soluble compounds : all Nitrates, most Sulphates except BaSO 4 and PbSO 4 , most Chlorides except AgCl and PbCl 2 .
      • Examples of water-insoluble compounds : Oxides, Hydroxides and Carbonates except those of Na + , K + and NH 4 + .
    • Coloured Compounds
      • Compounds containing transition metal ions are coloured.
      • Copper sulphate, CuSO 4 is blue .
      • Iron(II) hydroxide, Fe(OH) 2 is dirty-green .
      • Iron(III) hydroxide, Fe(OH) 3 is reddish-brown .
      • Potassium dichromate(VI), K 2 Cr 2 O 7 is orange .
      • Potassium manganate(VII), KMnO 4 is violet .
    • Examples of Precipitation
      • HCl(aq) + AgNO 3 (aq)  AgCl(s) + HNO 3 (aq)
      • A white precipitate of silver chloride is seen.
      • On further addition of aqueous NH 3 , silver chloride dissolved .
      After excess aq. NH 3 is added…
    • Examples of Precipitation
      • KI(aq) + AgNO 3 (aq)  AgI(s) + KNO 3 (aq)
      • A yellow precipitate of silver iodide is seen.
    • Examples of Precipitation
      • Na 2 SO 4 (aq) + Ba(NO 3 ) 2 (aq)  BaSO 4 (s) + 2NaNO 3 (aq)
      • A white precipitate of barium sulphate is seen.
    • Examples of Precipitation
      • H 2 SO 4 (aq) + Ba(NO 3 ) 2 (aq)  BaSO 4 (s) + HNO 3 (aq)
      • A white precipitate of barium sulphate is seen.