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Chemistry > C8 > Flashcards

C8 Flashcards

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1
Q

What is a formulation

examples

A

A mixture that has been designed as a useful product

paint, alloys, furitiliser

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2
Q

What is the test and result for hydrogen

gas?

A

Test: add BURNING splint to the gas
Result: burns with a squeaky pop

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3
Q

What is the test for oxygen?

A

Test: add GLOWING splint to the gas
Result: splint relights

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4
Q

What is the test and result for carbon

dioxide gas?

A

Test: bubble gas into limewater
Result: limewater turns cloudy

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5
Q

What is the test and result for chlorine gas?

A

Test: add damp blue litmus paper
Result: litmus paper bleaches and turns white

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6
Q

What is a pure substance? What are it’s properties?

A

-A single element or compound, not mixed with any other substance
-Hasn’t been mixed with anthing else
-1 specific melting and boiling point
-Has only 1 spot in chromatoghaphy

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7
Q

How can you test the purity of a substance

A

Measure its melting or boiling point. Impure substances have different melting and boiling points.

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8
Q

In chromatography, what is the stationary

phase

A

Chromatography paper

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9
Q

In chromatography, what is the mobile
phase

A

The solvent (e.g. water)

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10
Q

Which dye moves furthest up the paper

A

The most soluble

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11
Q

What is the equation for Rf value?

A

Rf=distance moved by substance/distance moved by solvent

distance moved by solvent measured by/in middle of dye

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12
Q

What should you remember to do in the
chromatography practical?

A

1.Draw start line in pencil
2.Make sure solvent level is below the start line

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13
Q

How can you test if a substance is pure in
chromatography.

A

A pure substance gives a single spot in all solvents.

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14
Q

What is the colour of the flame produced from lithium?

A

Crimson

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15
Q

What is the colour of the flame produced from
a COPPER containing compound?

A

Green

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16
Q

What is the colour of the flame produced from
a SODIUM containing compound?

A

Yellow

17
Q

What is the colour of the flame produced from
a POTASSIUM containing compound?

A

Lilac

18
Q

What is the colour of the flame produced from
a CALCIUM containing compound?

A

Orange-red

19
Q

Which solutions produce white precipitates
with sodium hydroxide?

A

Solutions containing aluminium, magnesium or calcium ions

20
Q

How can aluminium ions be distinguished from
calcium and magnesium ions?

A

Its precipitate will dissolve in excess sodium hydroxide

21
Q

What colour precipitate forms from adding
sodium hydroxide to copper (II) ions?

A

Blue

22
Q

What colour precipitate forms from adding
sodium hydroxide to iron (II) ions?

A

Green

23
Q

What colour precipitate forms from adding
sodium hydroxide to iron (III) ions?

A

Brown

24
Q

What is the test for carbonate ions?

A

Add hydrochloric acid, test gas formed with limewater

25
Q

What is the test for halide ions?

A

Add silver nitrate and nitric acid to generate a silver halide precipitate

26
Q

What colour are the halide precipitates?

A

chloride=white,
bromide=cream,
iodide=yellow

Chickens Be Idiots

27
Q

What is the test for sulfate ions?

A

Add barium chloride and hydrochloric acid, forms white precipitate

28
Q

What instrumental method can be used to test
for metal ions?

A

Flame emission spectroscopy

29
Q

What is the perpous of chromatogrphy?

A

Seperate mixtures based on their solubility to identify subsances

30
Q

What is the moblie phase in chromatoghraphy?

A

when subsance is moving up paper

31
Q

Decribe the method for chromatoghraphy

A
  1. Draw line in pencil ( so line doesn’t run into the inks)
  2. Add spots of unknow and known colour on the line
  3. Place chromatography paper in beacker with solvent, below pencil line
  4. Leave paper untill solvent has reached the top
  5. Remove paper, leave solvent to dry
  6. Compaire postions of known and unknown colours.

Chemistry (27 decks)

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