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264935 chemistry session 2 .pdf



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Title: Microsoft PowerPoint - AS chemistry session 2 - completed
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Edexcel
AS Chemistry
Paper 6243.02(3B)
Edexcel GCE Student Conference 2006

advancing learning, changing lives

Paper 6243.02(3B)
• 1 hour.
• 4-6 questions.
• Testing your knowledge and understanding of
laboratory chemistry.
• Page 30 of specification lists content.
• 50 marks.
• Mark combined with coursework or practical test to
give Unit 3 mark on 120.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Types of Questions on 3B
• Test for ions, gases.
• Tests for organic functional groups.
• Volumetric analysis (titrations) including mole
calculations.
• Temperature changes including ∆H calculations.
• Organic techniques including yield calculations.
• Planning exercise.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Test for ions and gases
• Know how to test for CO32-, HCO3-, SO42-, SO32-, halide ions,
NO3-, NH4+.
• Know flame test colours for Li, Na, K, Ca, Sr, Ba compounds.
• Know tests for gases H2, O2, CO2, NH3, Cl2, NO2, SO2.
• See tables and Question 1.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Organic Functional Groups





Know the tests from Topic 2.2 b.
Alkenes + Br2(aq); orange to colourless.
PCl5 for OH group(alcohols in AS); steamy fumes.
Identify halogen in halogenoalkanes by NaOH(aq) + heat
followed by HNO3(aq) + AgNO3(aq);
White, cream or yellow ppte.
• Warm alcohols with acidified K2Cr2O7.
Orange to green with 1o, 2o not 3o.
• See table and Question 2.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Volumetric Analysis
• Describe making up solution in volumetric flask.
• Describe carrying out titration including rinsing out pipette
and burette, drop-by-drop to end point, colour change of
indicator, concordant titres.
• Methyl orange- red(acid)-orange-yellow(alkali)
Phenolphthalein-colourless(acid)-pink-red(alkali).
• Choose titres for mean.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Volumetric Analysis
• Use:

volume(titre )
moles =
× concentration
1000

• Use mole ratio from equation.
• Calculate concentration in mol dm-3.
• Use:
moles = mass ÷ molar mass
• Comment on errors:
uncerta int y in each reading
% error =
× 100
reading
• See Question 3.
Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Temperature changes, ∆H
• Extrapolate increase/decrease in temp on graph and
read ∆T. Allows for cooling.
• Comment on errors; suggest improvements.
eg lid on plastic cup, more readings, use pipette to
measure volumes, more stirring.
• If a fuel(alcohol) burning there may be incomplete
combustion or loss of fuel by evaporation.

Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)

Calculating ∆H
• Calculate moles of reagent NOT in excess.
• Calculate heat released or absorbed:
Heat =

4.18 × mass solution × ∆T
kJ
1000

• Calculate:

∆H =

heat
kJ mol −1
moles

• Temp rise means exothermic reaction ∴–∆H
Temp fall means endothermic reaction ∴+∆H
• 2 sf normally enough for ∆H.
• See Question 4.
Edexcel GCE Student Conference 2006 – AS Chemistry - Paper 6243.02(3B)


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