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Elements, Compounds and Mixtures
What is a Compound?
A compound is a substance made from two or more elements
that have reacted chemically with
each other.
Remember
this definition as you might need it in the exam!
A compound is a completely new
material that will often have
totally different properties
from the elements that made
it.
For example
The element sodium is a
highly reactive
metal.
The element chlorine is a yellow-green
poisonous gas (non-metal).
When the two react
together they
form a compound called sodium
chloride.
Sodium chloride is common
salt, which you eat with food.
You would not want to eat the elements!
How can the Elements of a Compound
be Separated?
You cannot separate the elements of a compound
by physical
methods.
It can only be done by using more
chemical reactions
or by passing electricity through it (if it conducts
electricity).
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