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Elements, Mixtures & Compounds
ELEMENTS are the simplest substances in nature.
All of the elements are shown in a table called the PERIODIC TABLE. In this table they are grouped so that elements which behave in similar ways are in the same group.
Every element in the periodic table is given a SYMBOL (e.g. Fe is iron, Cu is copper, O is oxygen)
The smallest part of an element is called an ATOM
An element contains only ONE TYPE of atom - e.g. the element coppper contains only copper atoms, the element oxygen conttains only oxygen atoms and so on.
A COMPOUND contains two or more elements chemically bonded together.
A MIXTURE contains different elements or compounds mixed together (not bonded together)
MIXTURES can be separated in different ways:
1. A mixture of two liquids can be separated by DISTILLATION
2. A mixture of a liquid and an INSOLUBLE solid can be separated by FILTERING
3. A solid can be separated from a solution by EVAPORATING
off the liquid
Metals and Non-Metals
METALS usually have the following properties:
NON- METALS usually have the following properties:
The Reactivity Series
Different metals are more or less reactive than each other. We can order the metals by reactivity from the most reactive to the least reactive. We call this order the REACTIVITY SERIES:
We can test the reactivity of metals in two ways:
1. See how quickly they react with acid or oxygen (by burning
them in air)
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