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SIMPLE CHEMICAL EQUATIONS

    If the law of conservation of matter is to be kept, it means that there must be the same number of atoms in each half of the equation. There must be the same number of atoms in reactants and in the products.

     

    The law of conservation of matter states that matter is neither created nor destroyed in the course of chemical reaction. This is the main reason why the number of atoms of products must balance those of reactions and vice versa.

    So, the equation:

    Na+H2O=Na0H+H2isconsideredunbalanceandhencenotacceptable.

    This has to be balanced as:

    2Na+2H20=2Na0H (aq)+ H2(g)

    S=solid L=Liquids Aq=aqueous g=gas

     

    WRITING CHEMICAL EQUATIONS

    Chemical equations are written using chemical symbols and formulae. It is necessary to have as much detail as possible about what is going on in are action e.g. hydrogen gas reacts with oxygen gas to produce water.

    We translate this information to a word equation.

    Hydrogen (gas)+Oxygen gas = water

    (Reactants)                                       (Product)

    2H2+02                                      2H20

    Balanced equation

    Common chemical reactions include (a) Combustion of hydrocarbons (b) Neutralization reactions (c) Double decomposition

    Examples:

    1. C3H8+02 C02+H20
    2. HCl+Na0H NaCl+H20
    3. AgN03+NaCl AgCl+NaN03

     

    BALANCE CHEMICAL EQUATIONS

    aN2+bH2=cNH3

    N: 2a  =C……(i)

    H: 2b  =3C…..(ii)

    Let a=1

    From equation (i) 2 (1) = C

    2 = C               C = 2

    From equation (ii ) 2b =3 (2)

    2b = 6

    B =3

    A =1,  b=3     C=2

    N2+3H2=2NH3

     

    Two methods are commonly employed in chemical equations:

    1. Balancing by inspection.
    2. Balancing by the use of simultaneous equations.

     

    See also

     

    Air and Noise Pollution

    Environmental Health

    Classes of food

    NUTRITION

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