TEKNIK MENJAWAB KIMIA

Kesilapan yang biasa dilakukan oleh pelajar:

i. writing equations
ii. describing colors
iii. mistakes in drawing diagrams
iv. calculations
v. chemical tests
vi. mistakes in experiment-based questions
vii. incomplete/inaccurate statements or phrases

i. Writing equations

1. Equation not balanced
    Cth: Na + O2 --> Na2O

2. Cannot differentiate between
    - ionic equations: Zn + 2H+ --> Zn2+ + H2
       - half equations: 2H+ + 2e --> H2
                              Zn --> Zn2+ + 2e
    - chemical equations (complete equations)
       2HCl + Zn --> ZnCl2 + H2 
3. Do not write WORD EQUATIONS
4. Do not use symbol or formulae in answering structured and essay questions (except for ions or in diagrams)
5. Wrong half-equation
   Cth: 4OH-   -    4e     -->    O2    +   2H2O