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Chemistry (DSE) > Chemical Reactions (DSE) > Flashcards

Chemical Reactions (DSE) Flashcards

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1
Q

Precipitation with NaOH/ NH3:
Mg2+

A

white ppt

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2
Q

Precipitation with NaOH/ NH3:
Ag2+

A

white ppt

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3
Q

Precipitation with NaOH/ NH3:
Cu2+

A

blue ppt

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4
Q

Precipitation with NaOH/ NH3:
Fe3+

A

brown ppt

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5
Q

Precipitation with NaOH/ NH3:
Fe2+

A

dirty green ppt

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6
Q

Precipitation with NaOH/ NH3:
Pb2+

A

white ppt

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7
Q

Precipitation with NaOH/ NH3:
Zn2+

A

white ppt

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8
Q

Precipitation with NaOH/ NH3:
Al3+

A

white ppt

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9
Q

What turns blue litmus paper red

A

acid (blood)

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10
Q

What turns red litmus paper blue

A

alkali

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11
Q

Fe displace Cu

A

Brown solid
Solution turns paler (lighter in colour)

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12
Q

Zn displace Cu

A

Brown solid
Solution turns paler

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13
Q

Mg displace Cu

A

Colorless bubbles
Brown solid

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14
Q

Zn displaces Fe

A

Solution turns paler

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15
Q

Mg displaces Fe

A

Colourless bubbles form

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16
Q

Mg displace Zn

A

Colorless bubbles

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17
Q

Heating/ Burning:
Potassium

A

Lilac

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18
Q

Heating/ Burning:
Sodium

A

golden yellow flame

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19
Q

Heating/ Burning:
Calcium

A

red flame, white solid

20
Q

Heating/ Burning:
Magnesium

A

burn with a very bright white light, and a white powder forms

21
Q

Heating/ Burning:
Aluminum

A

a white powder forms

22
Q

Heating/ Burning:
Zinc

A

Form a yellow powder when heated
White powder when cooled

23
Q

Heating/ Burning:
Iron

A

yellow sparks, black solid form

24
Q

Heating/ Burning:
Lead

A

orange powder when hot
yellow powder when cool

25
Q

Heating/ Burning:
Copper

A

black powder formed on the surface

26
Q

Heating/ Burning:
Mercury

A

red powder forms on the surface

27
Q

Give the warning label of hydrogen gas

A

Explosive, flammable

28
Q

Give the warning label of ethanol

A

Flammable

29
Q

Give the warning label of unburnt hydrocarbon

A

Carcinogenic

30
Q

Give the warning label of chlorine gas

A

Toxic

31
Q

Give the warning label of concentrated sulphuric acid

A

Corrosive, oxidizing

32
Q

Give the warning label of concentrated hydrochloric acid

A

corrosive

33
Q

How to test for chloride ion

A

Add acidified silver nitrate
white ppt form

34
Q

How to test for sulphate ion.

A

Add acidified barium chloride
white ppt form

35
Q

How to test for water (apart from dry cobalt (II) chloride paper)

A

anhydrous (dry) copper (II) sulphate turns from white to blue

36
Q

How to test for water ?

A

dry cobalt (II) chloride paper turns from blue to pink

37
Q

Heating alone: PbO

A

yellow solid

38
Q

Heating alone: CuO

A

black solid

39
Q

Heating alone: ZnO

A

white solid

40
Q

Heating alone: Fe2O3

A

black solid

41
Q

Heating alone: Ag2O

A

brown solid

42
Q

Heating CuO with carbon

A

Brown solid is formed

43
Q

Heating PbO with carbon

A

silver solid formed
Pbo changes from yellow to orange

44
Q

Heating Fe2O3 with carbon

A

silvery solid formed

45
Q

Heating ZnO with carbon

A

Silvery solid formed
ZnO changes from white to yellow

Chemistry (DSE) (4 decks)

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