Chemistry Unit 3 - GCSE (entire syllabus)

Another one of my "home-made" revision packs! Just some notes of the entire syllabus! These are great to skim read before the exam as it has everything in quick easy bites (well as quick as can get) Good luck in your exams guys!!

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Chemistry
AQA ­ Unit 3
Brief History of the periodic table
Until recently there were two ways of categorising elements:
1) their physical and chemical properties
2) their relative atomic mass

In 1864, Newlands tried to arrange the elements in his law of octaves, but it was inconsistent and dismissed.…

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Indicator used:

STRONG acid + weak alkali Methyl orange (think of oranges being acidic)

Weak acid + STRONG alkali Phenolphthalein

STRONG acid + STRONG alkali Universal indicator

A pipette is used to measure accurately a volume of this solution

A second chemical is placed in a burette. This other solution…

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Water
You must know the water cycle off by heart.






Here are the different processes you must know:

Precipitation ­ basically rain

Canopy interception - The precipitation that is intercepted by plant foliage Snowmelt

Runoff - The variety of ways by which water moves across the land.

Infiltration - The…

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Helps grow healthy bones and teeth



Disadvantages

Causes scum
Doesn't lather properly
Causes lime scale when boiled


Causes

Calcium sulphate/ chloride
Magnesium sulphate/chloride
From millions of years of running through rocks

Removal

Ion-exchange column (exchanges sodium and hydrogen for calcium and magnesium)
Washing soda

Energy
Exothermic reactions give OUT heat…

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By adding Sodium hydroxide to some metals, we can attain what they are by recording the colour of the precipitate the form,
due to displacement. Here are the six you must know:

Calcium: white
Copper: blue
Iron (ll): sludgy green
Iron (lll): Reddish brown
Aluminium: white
Magnesium: white

However, if…

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Organic ­ Yellow or blue flame

Testing for saturated bonds

Add bromine water
Unsaturated ­ water decolourises
Saturated: Colour will stay brown


Test for water

Anhydrous cobalt chloride paper
Turns blue to pink if water is present



Empirical Formula
These are used to find the equation of a compound. E.g.…

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