Form 4 Chemistry Chapter 3 Chemical Formula and Equation
Formula and equations dr.surendran prambadath
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5. Chemistry Inorganic
Organic
Physics
Physical
Biology
Analytical
Science Geology Bio
Polymer
Medicine
Industrial
Materials Nano
Pharmacy
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11. Atom Molecule
Indivisible Can split in to
components
Smallest particle of an Smallest particle of a
element compound
It may or may not exist It can exist in the free
in the free state state
Atoms take part in During chemical
chemical reaction reaction molecules
split in to atoms.
14. 1 Write down the symbols or formulae of two radicals (A
& B) side by side, positive A on the left and negative B
on the right side.
A = Al B = Cl
Al Cl
2 Write their valences at the top
Al3 Cl1
3 Cross the valences.
Al3 Cl1 = AlCl3
4 Complex radicals are enclosed in brackets.
(NH4)2SO4
15. Molecular Formula of a compound is a
symbolic representation of a molecule
of the compound.
Molecular Formula Indicates;
a) Actual number of atoms of the
elements in a molecule of the
compound.
b) The molar mass of the substance.
16. Molecular Formula of Water is H2O
This indicates one molecule of
water contains two hydrogen atoms
and one oxygen atom.
Molar mass of H2O is ,
1x2 + 16 = 18 g mole-1