Formula show simplest ratio of atoms of each element in the chemical compound.
Formula yang menunjukkan nisbah terkecil atom bagi setiap element di dalam sebatian kimia.
Tips SPM : Calon mesti tahu definisi 'empirical formula'.
ANALISIS SOALAN SPM (2003-2010)
STRUCTURE QUESTION
SPM 2003 /PAPER 2/ QUESTION 1
Experiment to determine the empirical formula of magnesium oxide.
SPM 2007 /PAPER 2/ QUESTION 3
Experiment to determine the empirical formula of two compounds by different methods.
SPM 2009 /PAPER 2/ QUESTION 3
Experiment to determine the empirical formula of copper oxide
SPM 2004/ PAPER3/ QUESTION 1
Experiment to determine the empirical formula of magnesium oxide.
ESSAY QUESTION.
SPM 2010 / PAPER2/ QUESTION 7
Determine the empirical formula and molecular formula of hydrocarbon CALON MESTI TAHU!!
To determine empirical formula of compounds - two methods used. (For SPM)
#1 - Heat metal in crucible and lids - More reactive metal than hydrogen
#2 - Heat metal oxide in excess hydrogen gas in combustion tube and porcelain dish
Precaution in both experiment
In Method 1 (M1) :
During heating lid opened a while to allow excess oxygen from the air reacts with metal
Lid closed quickly to prevent white fume/solid escape to the surrounding.
This precaution is important : to get accurate value of product after heating.
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