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Chemistry > Practicals > Flashcards

Practicals Flashcards

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1
Q

CP1 measure molar gas volume
Risk assessment (3)

A

HCl, irritant, lab coat and googles, wash skin
H2, flammable, no naked flames, open windows
Mg, sharp and flammable, no open flames, tweezers, dress and disinfect any cuts

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2
Q

CP1 measure molar gas volume
Equipment (5)

A

Boiling tube
Bunged delivery tube
HCl
Mg strip
Gas syringe

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3
Q

CP1 measure molar gas volume
Method (4)

A

Lower boiling tube to vertical
Add Mg to HCl
Record gas produced
Vary Mg mass/length

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4
Q

CP1 measure molar gas volume
Results (2)

A

Plot mass vs volume graph
Find Mg molar volume

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5
Q

CP1 measure molar gas volume
Considerations (4)

A

Don’t use excess Mg, too much H2, explosion
Weak acid, slower reaction, less gas lost with bung
Some gas lost when adding bung

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6
Q

CP2 acid base titration
Risk assessment (3)

A

Na2CO3, irritant, goggles, wash skin
HCl, irritant, lab coat, goggles, wash skin
Methyl orange, flammable, keep away from naked flames

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7
Q

CP2 acid base titration
Apparatus (14)

A

Conical flask
Pipette
Burette
Balance
White tile
Weighing boat
Distilled water
Glass rod
Beaker
Volumetric flask
Funnel
HCl
Na2CO3
Methyl orange

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8
Q

CP2 acid base titration
Method (13)

A

Weigh empty weighing boat
Weigh Na2CO3, add to beaker
Dissolve solid in wast, stir with glass rod
Put in volumetric flask using funnel (include apparatus washings)
Make solution to 250cm3
Invert flask, all reacts, higher conc, accurate titration
Rinse and full burette with HCl
Record initial volume
Rinse then pipette NaCO3 into comical flask
Add methyl orange
Titrate to end point (yellow —> orange)
Find volumetric difference
Repeat until 2 concordant results

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9
Q

CP2 acid base titration
Results (2)

A

Find mean titre
Back titration

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10
Q

CP3 find HCl concentration
Risk assessment (3)

A

HCl, irritant, wear gloves, goggles, wash skin
NaOH, irritant, wear gloves, goggles, wash skin
Phenolphthalein, flammable, toxic, don’t leave near open flame

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11
Q

CP3 find HCl concentration
Apparatus (9)

A

Volumetric flask
Distilled water
Pipete
HCl
NaOH
Burette
Phenolphthalein
White tile
Conical flask

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12
Q

CP3 find HCl concentration
Method (7)

A

Rinse and pipette HCl into volumetric flask
Make up to 250cm3 with distilled water
Pipette 25cm3 into comical flask
Add phenolphthalein to HCl
Rinse and add NaOH to burette, record initial volume
Titrate to end point, colourless, beyond end point, drop wise
Repeat and get 2 concordant results

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13
Q

CP3 find HCl concentration
Results (2)

A

Find mean titre
Calculate HCl conc

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14
Q

CP3 find HCl concentration
Considerations (2)

A

Air bubbles in pipette
Swirl conical flask to distribute reactants, accurate titration reading

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15
Q

CP4 find rate of haloalkanes hydrolysis
Apparatus (8)

A

Test tubes
Test tube rack
Ethanol
Iodo/bromo/chloroalkane
P/S/T haloalkanes
Water bath
Silver nitrate
Stopwatch

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16
Q

CP4 find rate of haloalkanes hydrolysis
Method (7)

A

6 test tubes with respective haloalkanes
Add ethanol to each
Acclimatise in 60*C water bath
Ad silver nitrate separately
Acclimatise silver nitrate to constant temperature
Add silver nitrate to haloalkanes and start stopwatch
Record time for precipitate to form

17
Q

CP4 find rate of haloalkanes hydrolysis
Results (8)

A

Convert time to ROR
Chloro, slow
Bromo, middle
Iodo, rapid
P, slow
S, middle
T, rapid
Reflect C-X bond length/strength

18
Q

CP4 find rate of haloalkanes hydrolysis
Considerations (1)

A

Water bath not flame
Ethanol is flammable

19
Q

CP5 oxidation of alcohol
Risk assessment (6)

A

Propan-1-ol, flammable
Conc H2SO4, irritant, corrosive,
Na2Cr2O7, irritant, oxidant, toxic
Fehlings, corrosive
UI, harmful
Wear safety glasses and gloves

20
Q

CP5 oxidation of alcohol
Apparatus (18)

A

Pear shape flask
Boiling tube
Na2Cr2O7
Conc H2SO4
Propan-1-ol
Pipette
Bunsen burner
Anti bumping granules
Distilled water
Liebig condenser
Bunged delivery tube
Fume cupboard
Thermometer
Beaker
Na2CO3
UI
Fehling’s solution
Water bath

21
Q

CP5 oxidation of alcohol
Method (10)

A

Water and sodium dichromate
Shake and dissolve
Propan-1-ol in pear shaped flask with water
Add anti bumping granules, prevent aggressive boiling
Reflux
Pipette conc H2SO4 down condenser
Pipette sodium dichromate down condenser
Allow to boil
Then heat for 10 mins with Bunsen
Distill product into beaker

22
Q

CP5 oxidation of alcohol
Results (5)

A

Propanoic acid
Smell, fruity
UI, red
Fehlings, methanoic and ethanoic acid
Na2CO3, neutralisation, CO2, blue sodium propanoate

23
Q

CP6 haloalkane from alcohol
Risk assessment (4)

A

Haloalkanes, flammable
2 methyl propan-2-ol, flammable
HCl, corrosive, toxic vapour
Anhydrous CaCl2, irritant

24
Q

CP6 haloalkane from alcohol
Apparatus (13)

A

Stopcock
2 methyl propan-2-ol
Anhydrous CaCl2
Conc HCl
Separating funnel
Haloalkanes
NaHCO3
Na2SO4
Conical flask
Funnel
Distilled water
Cork
Liebig condenser

25
Q

CP6 haloalkane from alcohol
Method (13)

A

2 methyl propan-2-ol and conc HCl in conical flask
Stopper and shake in fume cupboard, release pressure
2 separate layers, add emulsifying CaCl2
Shake until dissolved and add to separating funnel
Discard lower aqueous layer
Add NaHCO3, remove excess HCl
Shake funnel, release pressure
Discard lower layer
Repeat until no more CO2 forms
Transfer tertiary chloride to conical flask
Add anhydrous NaSO4 to conical flask, remove excess water
Shake for 5 minutes
Distill through cotton wool plugged funnel

26
Q

CP6 haloalkane from alcohol
Results (1)

A

Fraction 50-52*C

27
Q

CP8 Hess’s law
Risk assessment (2)

A

Hydrated CuSO4, irritant, goggles, gloves
Anhydrous CuSO4, irritant, goggles, gloves

28
Q

CP8 Hess’s law
Apparatus (9)

A

Mass balance
Weighing boat
Polystyrene cup
Beaker
Thermometer
Lid
Anhydrous CuSO4
Hydrated CuSO4
Pipette

29
Q

CP8 Hess’s law
Method (5)

A

Distilled water in polystyrene cup in beaker, insulator, less energy lost to surroundings
Record initial temperature
Find hydrated/anhydrous CuSO4 mass with weighing boat
Add sample to water and stir
Record highest temperature reached

30
Q

CP8 Hess’s law
Results (3)

A

Anhydrous, exothermic
Hydrated, endothermic
Make Hess cycle

Chemistry (24 decks)

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