State Symbols used in Chemical Equations.
The equations from the two previous
(3) 2K + Cl2 2KCl
(4) 4Li + O2 2Li2O
still require state symbols to be complete.
The complete equations in words and symbols
potassium + chlorine potassium chloride.
2K(s) + Cl2(g) 2KCl(s)
oxygen lithium oxide.
4Li(s) + O2(g) 2Li2O(s)
symbols in brackets show the physical state of
the substance at the reaction temperature.
Solid (s), liquid (l), gas (g), or dissolved in water (aq).
aq is called aqueous which comes
from the Latin word aqua meaning water.
If you do not know the
state of a substance
see melting and boiling points.
If the melting point is above the reaction
the substance is solid (s).
If the boiling point is below the reaction
the substance is gas (g).
If the melting point is below the reaction
and the boiling point is above the reaction temperature,
then the substance is liquid (l).
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