pract Flashcards

always wash used equipment w/ deionised

1
Q

if ask add Barium Chloride

A

same, Barium Nitrate test
- nitric acid + barium nitrate
- hydrochloric acid + barium chloride

MUST ADD SAME ANION ACID FOR ACIDIFICATION
prevent contamination

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2
Q

if smth not given in pract, means…

A

NO NEED THIS!!
i.e. no limewater = no carbon dioxide gas

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3
Q

powder given
hydrogen/co2/o2 test?

A

Carbonate
Co2 Test

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4
Q

silvery/shiny
hydrogen/co2/o2 test?

A

hydrogen test

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5
Q

acidify
hydrogen/co2/o2 test?

A

co2 test

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6
Q

generic solution S given
hydrogen/co2/o2 test?

A

co2

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7
Q

add (soln.) Slowly

A

add few drops

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8
Q

add (soln.) until no further change, seen

A

add in excess
1/2 test tube

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9
Q

when anything involve H2O2
must do what?

A

hydrogen peroxide
test o2

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10
Q

no change

A

no visible change

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11
Q

for every action done in pract, there is…

A

1 observation

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12
Q

what to note down when filtering

A

appearance filtrate, residue

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13
Q

what to write down for pract

A
  1. hot/cold
  2. gas is pungent (ONLY smell in pract, chlorine//ammonia)
  3. colour
  4. mixture dissolve, _ solution
  5. no change observed
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14
Q

observation when co2/o2/h2 gas released

think about their characteristics

A

colourless, odorless gas produced

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15
Q

amend all mistakes

light blue ppt
soluble in excess

A

light blue ppt formed
soluble in excess Aq ammonia to give dark blue soln.

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16
Q

which gas have to write efferverscence produced

A

ALL gas
even chlorine gas e.g.

17
Q

how to determine identity of salt/carbonate

A
  1. soluble/insoluble (SPAN)
  2. what have you added alr?

1 e.g. no ppt other than blue ppt observed therefore indicate presence, G1 ions

2 (i.e. if you add sodium hydroxide -> R, cannot say R contain sodium chloride as you have added the ion into R)

18
Q

how desc metal (s)

A

shiny GREY solid
except Cu (brown solid)

SHINY IS NOT A COLOUR

even g1 lolol coz when u cut it as shiny as iron. dark part is oxidised (rusted) part.

19
Q

copper(II) colour

20
Q

how desc non-transition metal compound (aq)

A

colourless soln.

main determiner of colour is still compound // element

21
Q

wat 2 look out for (heating)

A
  1. condensation
  2. test gas
  3. colour change
22
Q

rust/corrosion of metals
difference, similarity

A

rust -> cnfm bad
corrode -> may be good

both req water, oxygen

23
Q

temperature to what sf/dp

24
Q

why use styrofoam/polystyrene cup in reactions?

A
  1. reduce heat loss to surroundings
25
Q

how to measure rate of reaction of smth that give out gas?

A
  1. measure volume of gas
  2. in fixed time interval
26
Q

pract how draw stopwatch

A

MUST LABEL

page 21
https://docs.google.com/document/d/1Ep_FO9CxYSFbxmf3Zqg9mgm9NNyt2enpfMDr49gufrU/edit?tab=t.0

27
Q

h2o2 reaction
catalyst

A

h2o2 (reversible) h2o + o2

Manganese Oxide / Copper Oxide

catalyst take part in chem reaction;
but chemically unchanged