Chemistry 3-Chemical Tests

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How would you test for Hydrogen?
Squeaky pop
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How would you test for carbon dioxide?
Cloudy limewater
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How would you test for oxygen?
Relight a dying splint
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How would you test for Ammonia
Add Sodium Hydroxide, the ammonium gas will turn damp red litmus paper blue
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How would you carry out a flame test?
Use a wire to place a sample of solution into a bunsen burner flame
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What is the flame colour for Potassium?
Lilac
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What produces a brick red flame?
Calcium
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What is the flame colour for sodium?
Yellow
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What would produce a green/blue flame?
Copper
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What is atomic spectroscopy?
The process by which the amount of specific atoms in a sample can be identified, using the colour to match with specific frequencies
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Are transition metal hyrdoxides soluble in water?
No
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How might you identify transition metal?
Add sodium hydroxide to displace the transition metal, producing a transition metal hydroxide and a precipitate
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How would you identify Iron 3
A rust coloured precipitate
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What produces a green precipitate (which oxidises to red) when sodium hydroxide is added?
Iron 2+
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What colour precipitate would copper produce after reacting with Sodium Hydroxide?
Green/ blue
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What is test for a halide?
Add silver nitrate to produce a precipitate
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What produces a cream precipitate?
A Bromide
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What colour precipitate does chloride produce?
White
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What gives a yellow precipitate after the addition of silver nitrate?
An iodide
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What can be done to test for halide ions, and what are the results?
Add dilute nitric acid (for impurity removal) , add silver nitrate (to form precipititates) the colours are as before
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What is the identifying feature of adding a carbonate to an acid?
Fizzing from carbon dioxide which can be tested for with limewater
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How can a sulfate be identified?
Add barium chloride and a white precipitate is formed
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How can an alcohol be identified?
Oxidised alcohols go from orange to green- turn orange dychromate crystals green OR infrared screening
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How might one test for an alkene?
Add orange Bromine water (the double bond becomes saturated and breaks) goes clear
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How might one test for a carboxylic acid?
Add sodium carbonate to produce bubbles (effervenscence) of carbon dioxide which can be tested with limewater
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How does infrared spectroscopy work?
It identifies certain bonds in organic molecules, makes the bonds vibrate and the different bonds can be identified as they vibrate at different frequencies.
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What can infrared spectroscopy do?
Check for successful reactions and identify the functional groups in a molecule
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How can infrared be used?
Drug development industry, medicine and product development by quick, simple and accurate method which can replace the need for chemical tests.
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Other cards in this set

Card 2

Front

How would you test for carbon dioxide?

Back

Cloudy limewater

Card 3

Front

How would you test for oxygen?

Back

Preview of the front of card 3

Card 4

Front

How would you test for Ammonia

Back

Preview of the front of card 4

Card 5

Front

How would you carry out a flame test?

Back

Preview of the front of card 5
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