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GCSE Chemistry > Chemistry: Chemical Analysis > Flashcards

Chemistry: Chemical Analysis Flashcards

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1
Q

what is a pure substance in chemistry

A

something that only contains one compound or element throughout

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2
Q

what two things tell you how pure a substance is

A

boiling point

melting point

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3
Q

what do impurities do to the boiling and melting point of a substance

A

lower the melting point

increase the boiling point

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4
Q

what are formulations

A

Mixtures with exact amounts of components

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5
Q

what is chromatography

A

analytical method used to separate the substances in a mixture

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6
Q

what are the two stages in chromatography

A

mobile phase

stationary phase

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7
Q

what is the mobile phase in chromatography

A

where the molecules can move either as a liquid or gas

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8
Q

what is the stationary phase in chromatography

A

where the molecules cant move either as a solid or really thick liquid

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9
Q

what is an Rf value

A

the ratio between the distance travelled by the solute and the distance travelled by the solvent

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10
Q

what is the test for Chlorine gas

A

Chlorine bleaches damp litmus paper turning it white

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11
Q

what is the test for Oxygen gas

A

put a glowing splint in a test tube containing oxygen. Oxygen will relight the glowing splint

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12
Q

what is the test for Carbon Dioxide

A

turns solution of limewater cloudy

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13
Q

what is the test for hydrogen

A

hold a lit splint at the end of a test tube containing Hydrogen. Hydrogen will cause a squeaky pop sound

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14
Q

what identifies metal ions

A

Flame test

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15
Q

what colour flames do lithium ions produce

A

crimson

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16
Q

what colour flames do sodium ions produce

A

yellow

17
Q

what colour flames do potassium ions produce

A

lilac

18
Q

what colour flames do calcium ions produce

A

orange-red

19
Q

what colour flames do copper ions produce

A

green

20
Q

what do some metals ions form in the presence of

hydroxides

A

coloured precipitates

21
Q

what coloured precipitates do Calcium ions produce

A

white

22
Q

what coloured precipitates do Copper(II) ions produce

A

blue

23
Q

what coloured precipitates do Iron(II) ions produce

A

green

24
Q

what coloured precipitates do Iron(III) ions produce

A

brown

25
Q

what coloured precipitates do Aluminium ions prodcue

A

white before redisolving

26
Q

what coloured precipitates do Magnesium ions produce

A

white

GCSE Chemistry (10 decks)

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