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Shell Formation:
Atoms 2,8,8
Protons Neutrons Electrons
Charge Positive Neutral Negative
Location Nucleus Nucleus Shells
Mass 1 1 1/2000
·Nucleus has an overall positive charge
·Amount of protons decides which
element it is…read more

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O Atomic/Mass Number
· The bigger number is the mass number
· = number of neutrons + protons
So in Oxygen:
· Smaller number is atomic number · Neutrons=8
· = number of protons · Protons= 8
· is the same as no. electrons · Electrons = 8
· Mass-atomic = no. neutrons
· Mass usually double atomic mass…read more

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Mixtures and Compounds
Mixtures Compounds
· Are easily separated · Difficult to separate
· no chemical bond · Chemically bonded
· Properties are a · Completely
mixture of both different properties
elements Fe S S
Iron Sulphur Iron sulphide-compound
Naming Compounds:
2 elements= `...'ide
3 +oxygen = `...'ate…read more

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Chemical Reactions
Changing Reactants into Products
· E.g.: sulphuric + sodium sodium + water
acid hydroxide sulphate
· Reaction Rates depend on:
· Temperature- temp= faster reaction
· Concentration- concentration= faster reaction
· Particle Size- smaller particles react quicker
· Catalysts- substances that speed up reactions…read more

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Exothermic Reactions give heat out
·Shown by a:
·temperature rise
·Made By:
·Burning fuels
·Neutralisation reactions ­
acid+ alkali…read more

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