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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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