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Modules 17 & 18 - Atoms, Elements, Compounds and Mixtures - RevisionHere are the key ideas from Modules 17 & 18 . Make sure that you also look at your written notes and the sites on the links page. Elements, Mixtures & CompoundsELEMENTS 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)
Separating MixturesMIXTURES 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-MetalsMETALS usually have the following properties:
NON- METALS usually have the following properties:
The Reactivity SeriesDifferent 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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