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Chemistry Free Revision Notes

11: Chemical Changes

Thermal Decomposition A single substance is broken down by heating. A good example of this is the cracking of hydrocarbons. Displacement When one more reactive element pushes another less reactive el

12: Electrolysis
This is the (chemical) process by which a compound in its molten state is decomposed to form its elements. Some of its uses are as follows: Extraction of reactive metals from their ore. (e.g. - alumin

13: Ion Analysis
Testing for Cations Cations are positively charged (+) ions. There are 2 basic tests for them: Flame test Adding NaOH (aq) to solution of ionic compound The flame test involves a clean nichrome

14: Bonding
Metallic Bonding This occurs in metals and is when electrons are given out from the metal atoms to make a "sea" of free electrons in between all of the metal atoms. These free electrons hol

15: Important Ions
The table below lists some important ions that you should really know about: Name of Ion Formula Hydroxide OH (-) Carbonate CO3 (-2)

16: Reactivity Series
The following list shows how reactive different elements are in relation to each other. This is a shortened list but contains most of the elements that you need to know about. Potassium    


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