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Chemistry Paper 2 > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

What is a pure substance ?

A

A pure substance is one that is just made of one element or compound

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2
Q

What is an example of a pure substance ?

A 
Water 
Ethanol
Magnesium 
Copper
Salt
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3
Q

What are examples of an impure substance ?

A

Orange juice
Stainless steel
Toothpaste

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4
Q

What is a formulation ?

A

A formulation is a mixture that has a precise purpose that are made by a formula

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5
Q

What is an example of a formulation ?

A

Cleaning products
Fuels
Cosmetics

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6
Q

What is chromatography ?

A

It is an analytical method used to separate the substances in a mixture and can be used to identify substances

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7
Q

What are the 2 phases in chromatography ?

A

Mobile phase

Stationary phase

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8
Q

What is the mobile phase ?

A

Where the molecules can move .

This is always a liquid or a gas

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9
Q

What is the stationary phase ?

A

Where the molecules can’t move

This can be a solid or a thick liquid

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10
Q

How do you work out the Rf value ?

A

Rf = distance travelled by substance
———————————
Distance travelled by solvent

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11
Q

What are the 4 commoner gases we test for ?

A

Chlorine
Oxygen
Carbon dioxide
Hydrogen

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12
Q

What is the test for chlorine ?

A

Put damp blue litmus paper over the test tube with chlorine in it
Positive test will show the paper turning white

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13
Q

Why does this happen (chlorine) ?

A

Because the chlorine has a low pH

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14
Q

What is the test for oxygen ?

A

Place a glowing splint in a conical flask

A positive test will mean the the splint will relight

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15
Q

What is the test for carbon dioxide ?

A

Bubble carbon dioxide through lime water

A positive test will show the lime water going cloudy

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15
Q

Why do this happen (oxygen ) ?

A

The concentration of oxygen is much higher in the conical flask

17
Q

What does this happen (carbon dioxide ) ?

A

The carbon dioxide reacts with the Limewater , re-producing calcium carbonate

18
Q

What is the test for hydrogen ?

A

Place a lit splint in a test/boiling tube

Positive test will result in a squeaky pop noise

22
Q

Why do this happen (hydrogen) ?

A

Hydrogen is very flammable is burns rapidly and the ‘pop’ is a small explosion

Chemistry Paper 2 (3 decks)

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