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AQA Chemistry GCSE > Topi 8 c > Flashcards

Topi 8 c Flashcards

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1
Q

What is a pure substance?

A

A single elementary or compound not mixed with any other substance s

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2
Q

What is a formulation?

A

A formulation is a mixture that has been designed as a useful product and is made of specific components in specific proportions

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3
Q

What is the formula for chromatography?

A

Distance moved by substance / distance moved by solvent

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4
Q

What is the test for hydrogen?

A

Place a burning splint Into test tube which causes hydrogen to burn rapidly and produce a squeaky pop sound

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5
Q

What is the test for oxygen?

A

Place a glowing splint inside a test tube. If it relights then oxygen is present

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6
Q

What is the test for carbon dioxide?

A

Carbon dioxide should be bubbled through calcium hydroxide and if present will turn cloudy

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7
Q

What is the test for chlorine?

A

Damp litmus paper will be bleached and turn pale green

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8
Q

What is the flame test for lithium?

A

Crimson flame

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9
Q

What is the flame test for sodium?

A

Yellow flame

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10
Q

What is the flame test for potassium?

A

Lilac flame

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11
Q

What is the flame test for calcium?

A

Orange - red flame

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12
Q

What is the flame test for copper?

A

Green flame

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13
Q

What is the test for metal ions?

A

Add sodium hydroxide

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14
Q

What is the test for calcium ions?

A

Calcium and sodium hydroxide make a white precipitate

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15
Q

What is the test for magnesium ions ?

A

Add sodium hydroxide for white precipitate

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16
Q

What is the test for aluminium ions?

A

Add sodium hydroxide for white precipitate that dissolves in excess sodium hydroxide

17
Q

What is the test for iron 2 ion?

A

Add sodium hydroxide for green precipitate

18
Q

What is the tests for iron 3 ion?

A

Add sodium hydroxide for red brown precipitate

19
Q

What is the test for copper 2 ion?

A

Add sodium hydroxide for blue precipitate

20
Q

What is the test for carbonates?

A

Add carbonates to acid to make carbon dioxide

21
Q

What is the test for halides and what are the results?

A

Add silver nitrate solution in the presence of dilute nitric acid.
Silver chloride - white
Silver bromide - cream
Silver iodide - yellow

22
Q

What is the test for sulphate ions?

A

Add barium chloride in the presence of hydrochloric acid for a white precipitate

23
Q

What are the positives of using instrumental methods to detect elements and compounds?

A

Accurate
Sensitive
Rapid

24
Q

What are the negatives of using instrumental methods to detect elements and compounds?

A

Requires special training
Expensive

25
Q

What is flame emission spectroscopy?

A

An example of an instrumental method to analyse metal ions. Sample is placed into flame and light given out is passed through a spectroscope. This can be analysed to find the ion and it’s concentration

AQA Chemistry GCSE (14 decks)

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