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CHEMICAL REACTIONS

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c) change of color. d) change in energy ( this could be manifested as light or heat) ... Zn 2HCl ZnCl2 H2. 2Na 2H2O 2NaOH H2 ... – PowerPoint PPT presentation

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Title: CHEMICAL REACTIONS


1
CHEMICAL REACTIONS
  • A chemical reaction can be observed or has taken
    place when
  • a) a gas is given off
  • b) a precipitate is formed
  • c) change of color
  • d) change in energy ( this could be manifested
    as light or heat)

2
  • Classification of Chemical Equations
  • Chemical equations can be classified into six
    simple types
  • combination reactions
  • decomposition reactions
  • single replacement reactions
  • d) double replacement reactions
  • neutralization reactions
  • oxidation-reduction reactions
  • f) combustion reactions

3
  • Examples of decomposition reactions
  • The general form is compound    element
    element
  • 2H2O    2H2 O2
  • H2CO3    H2O CO2

4
Combination reactions - two or more substances
(either elements or compounds) react to produce
one substance. These reactions are also called
synthesis reactions. A
B ---gt AB
2 Mg O2 ---gt 2 MgO C O2 (excess) ---gt
CO2 H2O MgO ---gt Mg(OH)2 2 Na Cl2 ---gt 2
NaCl
5
Combination Reactions
6
  • Examples
  • The general form is
  • element compound    compound element
  • Zn 2HCl    ZnCl2 H2
  • 2Na 2H2O    2NaOH H2

7
  • Examples of double displacement reactions
  • The general form is compound compound   
    compound compound
  • 2KCl Pb(NO3)2    2KNO3 PbCl2

8
Double displacement reactions
9
Neutralization reaction - the reaction of an acid
with a base to produce salt and water.
HCl NaOH ---gt NaCl H2O
  • Examples of combustion reactions
  • The general form is hydrocarbon oxygen   
    carbon dioxide water
  • CH4 2O2    CO2 2H2O
  • C7H16 11O2    7CO2 8H2O

10
The reaction between methane and oxygen.
11
Oxidation-Reduction reactions - chemical
reactions in which a transfer of electrons occur
are classified as oxidation-reduction reaction or
redox reaction. Na(s) 1/2 Cl2 (g) ----gt
NaCl(s)
12
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