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BMAT > Chemistry 8 -Electrolysis > Flashcards

Chemistry 8 -Electrolysis Flashcards

1
Q

Lithium ions flame colour?

A

Crimson Flame

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2
Q

Sodium ions flame colour?

A

Yellow flame

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3
Q

Potassium ions flame colour?

A

Liliac Flame

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4
Q

Calcium ions flame colour?

A

Red flame

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5
Q

Barium ions flame colour?

A

Green flame

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6
Q

What colour does chlorine turn damp litmus paper?

A

bleaches it turning it white

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7
Q

How can you test for oxygen

A

it relights a glowing splint

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8
Q

How can you test for hydrogen?

A

squeaky pop

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9
Q

Calcium Hydroxide forms when calcium mixes with what?

What colour does it go?

A

NaOH

White precipitate

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10
Q

Copper (2) when mixed with NaOH turns what colour?

What does it form?

A

Blue

Copper hydroxide

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11
Q

Iron (2) when mixed with NaOH turns what colour?

What does it form?

A

Green

Iron Hydroxide

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12
Q

Iron (3) when mixed with NaOH turns what colour?

What does it form?

A

Brown

Iron Hydroxide

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13
Q

Aluminium mixed with NaOH turns what colour?

What does it form?

A

Colourless solution

ALuminium hydroxide

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14
Q

Magnesium mixed with NaOH turns what colour?

WHat does it form?

A

White

Magnesium Hydroxide

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15
Q

Acid + Carbonates =

A

Salt + water + CO2

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16
Q

Testing for carbonates can be done how?

A

Limewater turning cloudy

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17
Q

GIve 3 examples of halide ions

A

Chloride / bromide / iodide

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18
Q

How can you test for Halides?

A

Add dilute nitric acid

then Silver Nitrate Solution

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19
Q

With the Halide test, what colour does Chloride ions go?

Whats formed?

A

White Precipitate

Silver Chloride

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20
Q

With the Halide test, what colour does Bromide ions go?

Whats formed?

A

Cream Precipitate

Silver Bromide

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21
Q

With the Halide test, what colour does Iodide ions go?

WHats formed?

A

yellow Precipitate

Silver Iodide

22
Q

How do we test for Sulphate ions?

A

add Dilute HCl

Then Barium Chloride Solution

23
Q

Whats formed if sulphate ions are present?

A

Barium Sulphate

WHite precipitate

24
Q

In the Mobile Phase, what can molecules do?

What generally are mobile phase?

A

They can move

Liquid/gas

25
Q

In the Stationary Phase, what can molecules not do?

What generally are mobile phase?

A

They cant move

Solid or a thick liquid

26
Q

In paper chromotography, what is the stationary phase?

              "                         what is the mobile phase?
A

The paper

Solvent (Ethanol/water)

27
Q

The amount of time spent in each phase, depends on what two things?

A

How soluble they are in the solvent

How attracted they are to the paper

28
Q

Molecules with a ………. in the solvent , and are less ……. to the paper, will spend ……… in the mobile phase.

what does this cause

A

Higher solubility , attracted , more time

They move up the paper more

29
Q

in Thin Layer Chromatography, what is the stationary phase?

A

Silica gel

30
Q

The result of chromotagraphy analysis, is called what?

A

Chromatogram

31
Q

What is the Rf?

A

Ratio between the distance travelled by the dissolved substance and the distance travelled by the solvent

32
Q

what can standard reference materials (SRM) do?

A

Check identities of substances

33
Q

In titrations, Phenolphathalein is what colour in acid? WHat colour in alkali?

A

Pink in Alkali

Colourless in acids

34
Q

In titrations, Methyl Orange is what colour in acid? What colour in alkali?

A

Yellow in alkali

Red in Acids

35
Q

Number of moles =

A

Concentration x Volume

36
Q

Mass in grams

A

Moles x RFM

37
Q

% purity =

A

Calculated mass of substance
———————————————- x100
Mass of impure substance at start

38
Q

In electrolysis, what need substance needs to be present?

A

Ionic substance thats molten/solution

39
Q

Electrolytes do what do electricity?

What do they contain

A

conduct electricity

Free ions

40
Q

Electrons are taken away from where and given to where?

A

Taken AWAY from POSITIVE electrode

GIVEN to other ions at the NEGATIVE electrode

41
Q

Oxidation is a gain of what?

A

Oxygen

42
Q

Reduction is a loss of what?

A

Oxygen

43
Q

In the Molten ionic substance, where does the positive ions go to?

A

Negative electrode

They accept electrons to become an atom

44
Q

When metal ions and H+ ions (From water) are present, what happens when metals that are MORE REACTIVE than hydrogen go to become?

What happens when they are LESS REACTIVE

A

they stay as ions if they are more reactive (Hydrogen produced)

They become atoms if they are less reactive (H+ remain H+ ions)

45
Q

When halide ions and OH- ions (from water) are present, , what happens to the halide ions?

What happens when halide are not present

A

They form the atom (chlorine, bromine, iodine)

O2 will form

46
Q

what metals are less reactive than hydrogen?

A

copper / silver /gold / platinum

47
Q

Draw out what the electrolysis of Sodium Chloride and the products formed

and HCl

A

=

48
Q

When electroplating, the object being plated is always the

A

Cathode

49
Q

What can a seperating funnel do?

A

Separate immiscible liquids

50
Q

What can fractional distillation separate?

A

Miscible liquids

51
Q

How can you separate soluble/insoluble solids?

A

Dissolving

Filtration

Cystallisation

BMAT (21 decks)

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