Forensics Revision

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Melting point
When a solid turns into a liquid
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Boiling point
When a liquid turns into a gas
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Organic
Contains carbon (also a type of farming which does not use chemicals)
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Formula for carbon dioxide
Co2
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Formula for water
H2o
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Formula for glucose
C6H12O6
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Formula for ethanol
C2H5OH
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Flame test
Identifies metal ions (different metals go different colours)
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Colour of sodium ions in a flame test?
Orange
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Colour of potassium in a flame test?
Purple
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Colour of calcium ions in a flame test?
Red
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Colour of copper ions in a flame test?
Green
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Soluable
It will dissolve
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Insoluable
It will not dissolve
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Filtering
Used to remove solid particles to make a clear solution
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Universal indicator
Tests the pH/ To identify acids, alkali and whether it is neutral
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Colour of acid with universal indicator?
Red/Yellow/Orange
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Colour of neutral with universal indicator?
Green
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Colour of an alkali with universal indicator?
Blue/Purple
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Precipitation reaction
When a solid is formed from 2 liquids
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Barium chloride
Used to test for sulphate irons - It goes cloudy
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Silver nitrate
Used to test for chloride ions - It goes cloudy
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Hydrochloric acid
Used to test carbonate ions - It fizzes/makes bubbles
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Lime water
Used to test for carbon dioxide - makes it go cloudy
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Potassium Dichromate
Is used to test for ethanol (alcohol) colour change is from orange to green
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Breathalyser
Used to see if someone has been drinking/Has alcohol in their system
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Electron
Paricles in shells around the nucleus of an atom
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Ionic bonding
1 atom gives electons to the other atom
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Covalent bonding
Atoms share electrons
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Lattice
Giant structure made up of lots of positive and negative ions
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Type of compound with a high melting point
Ionic because very strong attraction between ions - lots of enegy is needed to make the particles move apart to form a liquid
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Type of compoud with a low melting point
Covalent due to a weak attraction of molecules - not much energy is needed to make the particles to move apart to form a liquid
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Other cards in this set

Card 2

Front

Boiling point

Back

When a liquid turns into a gas

Card 3

Front

Organic

Back

Preview of the front of card 3

Card 4

Front

Formula for carbon dioxide

Back

Preview of the front of card 4

Card 5

Front

Formula for water

Back

Preview of the front of card 5
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