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“We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.” ― Antoine Lavoisier, Elements of Chemistry

Wednesday, 5 March 2014

FOR CP2 ONLY!

Here are pointers to review for midterm test:
1. Exothermic and Endothermic reaction: 
    -  The principle of exothermic and endothermic reaction/process;
    -  describing exo endo reaction in the term of breaking bonds and forming bonds;
    -  exo-endo process in the changing state of matter
    -  The examples of exo endo
2. Chemical Equations: Balancing Chemical Equations
    -  describing chemical equations: the signs in equations
    -  balance a chemical equations

Balance the following equations.

1         1.  ___C2H3Cl   + ___O2 à ___CO2  + ___H2O   + ___HCl
2         2.      ___(NH4)2Cr2O7 à ___NH3  + ___H2O  + ___Cr2O3  + ___O2
3         3.      ___Al  + ___NaOH  + ___H2O à ___NaAl(OH)4  + ___H2
4         4.      ___NH4Cl   + ___Ca(OH)2 à ___CaCl2  + ___NH3   + ___H2O
5         5.      ___Al  + ___NH4ClO4 à ___Al2O3  + ___AlCl3  + ___NO  + ___H2O
6         6.      ___H2SO4  +  ___NaHCO3 à ___Na2SO4    + ___CO2    + ___H2O
7         7.      _____ NaOH (aq) + _____ H2SO4 (aq) → _____ H2O (l) + _____ Na2SO4 (aq)
8         8.      _____ K (s) + _____ H2O (l) → _____ KOH (aq) + _____ H2 (g)
9.      ____ H2 + ____ O2 à ____ H2O
10.  ____ Pb(OH)2 + ____ HCl à ____ H2O + ____ PbCl2
11.  ____ AlBr3 + ____ K2SO4 à ____ KBr + ____ Al2(SO4)3
12.  ____ CH4 + ____ O2 à ____ CO2 + ____ H2O
13.  ____ C8H18 + ____ O2 à ____ CO2 + ____ H2O
14.  ____ FeCl3 + ____ NaOH à ____ Fe(OH)3 + ____NaCl
15.  ____ Ag2O à ____ Ag + ____O2

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