gcsescience.com 2 gcsescience.com
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.
The element sodium is a highly reactive metal.
The element chlorine is a yellow-green poisonous gas (non-metal).
When the two react
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).
Links Solid Liquid Gas Revision Questions
gcsescience.com The Periodic Table Index Chemistry Quiz gcsescience.com
Home GCSE Chemistry GCSE Physics
Copyright © 2015 gcsescience.com. All Rights Reserved.