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7458216
Chemistry Extension
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Mind Map on Chemistry Extension, created by Rachel Cordell on 26/01/2017.
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Rachel Cordell
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Rachel Cordell
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Chemistry Extension
Periodic table
Created by Mendeleev in 1869
Protons, neutrons and electrons were created in late 19th century
Elements arranged in order of atomic number
Group number is equal to number of electrons
Newlands law of Octaves was the first good effort
Arrangedin sets of eight
Alkali Metals
As you go down Group 1, the alkali metals become more reactive
Because the electrons are further from the nucleus
Lithium, Sodium and Potassium, (Rubidum and Caesium)
They all have 1 outer electron
when mixed with non metals, they form compounds
Any reaction with water produces hydrogen gas
Halogens
As you go down the group, the halogens get less reactive, have a higher melting point and a higher boiling point
They are all non metals with coloured metals
Flourine is a very reactive, poisonous yellow gas
Chlorine is fairly reactive, poisonous dense green gas
Bromine is a dense, poisonous red-brown liquid
Iodine is a dark grey crystalline solid or a purple vapour
Form ionic bonds with metals
Transition elements
They are in the middle of group 2 and 3
Good conductors of heat and electricty
Dense strong and shiny
Mush less reactive than Group 1 - they don't react with oxygen or water
Transition metals have more than 1 ion
Potassium chromate is yellow, potassium maganate is purple, copper sulfate is blue
Water
Hard and Soft
Water quality
Drinking water needs to be of good quality
There are 4 stages of cleaning water from reservoirs
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