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Chemistry C1-C6 revision > Chemical analysis > Flashcards

Chemical analysis Flashcards

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1
Q

What is a Pure substance?

A

It is a substance that contains only one compound or element nothing mixed.

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2
Q

How can you test the purity of a substance

A

by measuring its melting and boiling point and comparing it to the actual boiling and melting point of the substance using the data book

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3
Q

If the melting and boiling point is closer to the actual melting and boiling point what does it tell you about the substance?

A

The more pure the substance is

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4
Q

How do you know if a substance is impure?

A

They have a range of melting and boiling points compared to their actual points.

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5
Q

How do you know the presence of a impure substance?

A

If the melting point is lower

If the boiling point increases.

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6
Q

What are formulations?

A

Useful mixtures with precise purpose that are made by following a formula.

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7
Q

Paint is a formulation composed of what?

A

Pigment
Solvent
Binder
Additives

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8
Q

What is a solvent?

A

A substance that causes things to dissolve

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9
Q

Give an example of solvent?

A

water

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10
Q

What is a solute?

A

A substance that dissolves

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11
Q

Give an example of a solute?

A

Pen dot

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12
Q

What is Chromatography?

A

is an analytical method used to separate the substance in a mixture, which can be used to identify substances.

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13
Q

What are the 2 phases of chromatography?

A

A mobile phase

A stationary phase

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14
Q

What is a mobile phase?

A

Where the molecules can move, this is always a liquid or a gas

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15
Q

What is the Stationary phase?

A

Where the molecules can’t move, this can be a solid or a really thick liquid.

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16
Q

During chromatography what does the Mobile phases move through?

A

A stationary phase

17
Q

What is the stationary phase in Paper chromatography?

A

Filter paper

18
Q

What is the Mobile phase in Paper chromatography?

A

The water

19
Q

If a substance is less soluble what does it mean?

A

Travels less distance on the filter paper

20
Q

If a substance is more soluble what does this mean?

A

Travels further

21
Q

What does RF mean?

A

Retention factor

22
Q

If a substance has a larger RF what does it mean?

A

More soluble in the solvent

23
Q

If a substance has a smaller RF what does it mean?

A

Less soluble in the solvent

24
Q

How do you calculate the retention factor (RF)?

A

Distance traveled by the substance/ Distance traveled by solvent.

25
Q

What are the 4 common gas tests?

A

Chlorine
Oxygen
Carbon dioxide
Hydrogen

26
Q

How do you test for chlorine?

A

Put litmus paper in chlorine and turns the paper white

27
Q

How do you test for oxygen?

A

Put a glowing splint in side a test tube and the oxygen will light up again.

28
Q

How do you test for Carbon dioxide?

A

Have a test tube of calcium carbonate with Hydrocholric acid and have a test tube of lime water(Calcium hydroxide) put a gas syringe in the calcium carbonate and hydrochloric acid then put it in the test tube of lime water and if their are bubbles their is CO2.

29
Q

How do you test for Hydrogen?

A

Light a splint then put it in a test tube containing hydrogen which will make a squeaky pop.

30
Q

What is Limewater?

A

Calcium hydroxide dissolved in water (aqueous).

Chemistry C1-C6 revision (14 decks)

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