Headings Search Questions 
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Elements, Compounds and Mixtures
Chemical Properties.
The phrase "chemical properties"
describes the way that
an element or
compound
reacts chemically with other substances.
The chemical properties are determined by
the number of electrons in the outer shell of the
atom.
This is the same as an elements group number in the periodic
table.
Physical Properties.
The physical properties of an element or compound are
1) Melting
and boiling
point.
2) Density.
3) Conduction of Electricity.
4) The size of an atom, ion or molecule, and its
rate of diffusion.
5) Hardness, toughness, strength
etc.
Quantitative and Qualitative.
Quantitative means describing a reaction
in terms of the amounts (quantities) of substances.
Qualitative means describing a reaction
in terms of what it does.
For example, when magnesium burns in air,
a qualitative description would be
"Magnesium burns in air with a
brilliant white flame
to form magnesium oxide"
a quantitative description would be
"10g of magnesium burns in
air to form 16·67g of
magnesium oxide"
(see moles).
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