Paper 2 - Chemical analysis Flashcards

1
Q

What is a pure substance?

A

is not mixed with any other substances

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2
Q

when does a pure substance melt?

A

At a specific fixed temperature (specific fixed boiling point) the line is straight and not diagonal on a graph

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3
Q

what is a formulation?

A

A complex mixture that has been designed as a useful product e.g. fuels, cleaning products, paints, medicines

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4
Q

Chromatography?

A

take a piece of chromatography paper and draw a pencil line near the bottom. Then put the dots of our colours on the pencil line. Next place the bottom of the paper in a solvent (a liquid that dissolves substances). the solvent now moves up the paper and dissolves the inks, and the two coloured dots are also carried up the paper

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5
Q

in chromatography, how do you know if a colour was pure?

A

Because there’s only one spot on the paper

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6
Q

In chromatography, how do you know if a colour is a mixture?

A

if the colour has separated into two different colours

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7
Q

How do we test for hydrogen?

A

remove the top of the tube and insert a burning splint. Hydrogen gas burns rapidly and produces a pop sound

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8
Q

how do we test for oxygen?

A

insert a glowing splint into the tube. If it is oxygen, the splint will relight into flames.

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9
Q

how do we test for carbon dioxide?

A

Take some of the carbon dioxide solution and put it into a tube of limewater. If we repeat this several times, the limewater may turn cloudy (carbon dioxide)

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10
Q

How do we test for chlorine?

A

insert a damp litmus paper into the mouth of the test tube. Chlorine will bleach the litmus paper and turn it white

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