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GCSE AQA Chemistry > C12 - Chromatography + pure substances > Flashcards

C12 - Chromatography + pure substances Flashcards

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1
Q

pure substance

A

made up of one substance only
either an element or compound

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2
Q

impure

A

mixture of 2 or more elements/compounds

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3
Q

identify pure substances

A

by their boiling points/ melting

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4
Q

pure substance bioling point

A

sharp

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5
Q

impure substances boiling point

A

vary over a range

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6
Q

impurities effect on boiling and melting points

A

-lowers melting point
-raises boiling point

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7
Q

test for pure water

A

-melts at 0 degrees celsius
-boils at 100 .c

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8
Q

purer the compound =

A

narrower the melting point range

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9
Q

formulation

A

-mixture that has been designed to produce a useful product

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10
Q

eg of formulations

A

-paint
-medicinal drugs
-fuels
-fertilisers
-cosmetics
-food products

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11
Q

paint formulations

A

-pigment
-binder
-solvent

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12
Q

pigment

A

-provides colour

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13
Q

binder

A

allows paint to attach to object and dry to form a protective film

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14
Q

solvent

A

-help pigment/ binder to spread well

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15
Q

cleaning products: surfactant

A

detergent

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16
Q

cleaning products: water

A

thins mixture

17
Q

cleaning products: colouring/frangance

A

makes it more appealing to buyer

18
Q

cleaning products: rinse agent

A

-helps water to drain off

19
Q

chromatography

A

separates/ identifies mixtures that are unknown
-used for ink

20
Q

a substance with a stronger force of attraction between itself and mobile phase

A

travels a greater distance in a given time

21
Q

mobile phase

A

moves through stationary phase
-carries components
-solvent

22
Q

when does the spot not travel as far in chromatography

A

-stronger force of attraction to stationary phase

23
Q

stationary phase

A

paper

24
Q

mixture shows

A

more than 1 spot formed

25
Q

pure spots show

A

1 spot

26
Q

how to identify elements

A

compare known spots with unknown ones

27
Q

retention factor equation

A

distance moved by substance / distance moved by solvent

GCSE AQA Chemistry (36 decks)

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