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End of year > Science - Separating mixtures, chromatography & gas testas > Flashcards

Science - Separating mixtures, chromatography & gas testas Flashcards

1
Q

Solute

A

Substance that dissolves

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2
Q

solvent

A

liquid that dissolves a substance

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3
Q

Filtration

A

separating an insoluble solid from a liquid

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4
Q

distillation

A

separating a solvent from a solution

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5
Q

What are the steps of chromatography

A
  1. Draw a line using pencil on chromatography paper
  2. mark your sample (inks)
  3. clip paper hanging from top
  4. put on lid to reduce evapouration of solvent
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6
Q

what mistakes should you avoid in chromatography and why?

A
  1. drawing the line with pen - it will dissolve in the solvent (affecting the results)
  2. putting the solvent above the ink - it will be dissolved
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7
Q

What is the independant variable in chromatography?

A

Solvent

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8
Q

What is the dependant variable in chromotography?

A

Distance the pigments moved

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9
Q

Control variables in chromotography

A

temperature, solvent volume

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10
Q

Chromotogram

A

shows results of separated components of mixture

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11
Q

chromotography

A

method used to separate mixtures into their different chemicals based on solubility

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12
Q

solvent front

A

maximum distance solvent moves up paper

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13
Q

stationary phase

A

medium which mobile phase passes through

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14
Q

mobile phase

A

solvent that carries the sample

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15
Q

what is the equation for the rf value?

A

distance moved by substance/ solvent

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16
Q

What does the Rf value show

A

how far the substance has moved up compared to the solvent

17
Q

what is the Rf value always below

A

1

18
Q

test for hydrogen

A

lit splint in test tube, squaky pop noise

19
Q

test for oxygen

A

glowing splint will relight

20
Q

Carbon dioxide test

A

limewater will turn cloudy

21
Q

Test for chlorine

A

damp litmus paper is bleadched white

End of year (8 decks)

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