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CHEMICAL EQUATIONS
A chemical equation tell us what is
happening in a reaction.
Word Equations:
- are qualitative (or descriptive)
- may include state symbols: (s), (l), (g), (aq)
e.g. hydrogen(g) + fluorine(g) hydrogen fluoride(g)…read more

Slide 3

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CHEMICAL EQUATIONS
Balanced Symbol Equations (stoichiometric
equations)
- are quantitative (or numerical)
- obay the law of conservation of mass
- tell us the number of moles of each substance
involved (the stoichiometry)
- may also include state symbols: (s), (l), (g), (aq)
eg. H2(g) + F2(g) 2HF(g)…read more

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CHEMICAL EQUATIONS
NB: Some non-metallic elements exist as diatomic
molecules. They are;
Hydrogen, H2
Oxygen, O2
Nitrogen, N2
Fluorine, F2
Chlorine, Cl2
Bromine, Br2 Group 7
Iodine, I2
Astatine, At2
LEARN THESE…read more

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CHEMICAL EQUATIONS
Example 1:
Sulphur dioxide + hydrogen sulphide sulphur + water
Correct
formulae SO2 + H 2S S + H 2O
Balance SO2 + 2 H 2S 3S + 2 H 2O…read more

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CHEMICAL EQUATIONS
Example 2:
Copper(II) copper(II) + nitrogen + oxygen
nitrate oxide dioxide
Correct
formulae Cu(NO3)2 CuO + NO2 + O2
Balance Cu(NO3)2 CuO + 2 NO2 + ½ O2
Round to 2 Cu(NO3)2 2 CuO + 4 NO2 + O2
whole
numbers
NOW TRY TASK 1…read more

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