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2024 CHEMISTRY PAPER 3 EDEXCEL EXAM WITH ANSWERS
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2024 CHEMISTRY PAPER 3 EDEXCEL EXAM WITH ANSWERS
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2024 CHEMISTRY PAPER 3EDEXCEL EXAM WITH ANSWERS
Give a reason why the wire is dipped into acid and then heated in the first
stage. - CORRECT-ANSWERSIt is heated to remove the residue of the
previous sample being tested
State why fresh concentrated hydrochloric acid is used in the second stage
of the flame test. - CORRECT-ANSWERSThe acid can become contaminated
with residue from previous tests (which can produce incorrect results)
State why hydrochloric acid is used in the second stage of the flame test. -
CORRECT-ANSWERSConcentrated hydrochloric acid produces volatile
chlorides
Explain, with reference to electron transitions, the formation of the colour in
a
flame test. - CORRECT-ANSWERSElectrons are excited and are promoted to
higher energy levels
Electrons fall from the excited state to lower energy levels
Electrons release energy/photons as visible light
Write the formula of potassium chlorate(V). - CORRECT-ANSWERSKClo3
Write the equation for the first electron affinity of chlorine. Include state
symbols. - CORRECT-ANSWERSCl(g) + e- -----> Cl-(g)
The standard electrode potential for the chlorine / chloride ion half-cell is
1⁄2Cl (aq) + e− ⇌ Cl−(aq) EO = +1.36V
(i) Identify an oxidising agent from the Data Booklet that will convert chloride
ions into chlorine under standard conditions. - CORRECT-ANSWERSacidified
potassium manganate
Analysis shows that a compound has the molecular formula C4H8O2. A
student suggests that the compound could be either A or B.
A - CH3CH2CH2COOH or
B - HOCH2CH=CHCH2OH
(a) Deduce a chemical test which would give a positive result for A but not
for B. Include the reagent and observation. - CORRECT-ANSWERSNaHCO3
effervescence
, Deduce a chemical test which would give a positive result for B but not for A.
Include the reagent and observation. - CORRECT-ANSWERSbromine water
orange/yellow/brown solution
This question is about aluminium chloride.
(a) Complete the electronic configuration of an aluminium atom. - CORRECT-
ANSWERS1s2 2s2 2p6 3s2 3p1
This question is about the Ag+(aq)|Ag(s) half-cell.
(a) A student was asked to plan an experiment to measure the standard
electrode potential of the Ag+(aq)|Ag(s) half-cell.
(i) State the conditions of temperature and pressure under which standard
electrode potentials are measured - CORRECT-ANSWERS25°/298K
1atm/100KPa
Compound C is a pink crystalline solid containing two cations and one anion.
(a) Three tests were carried out on C.
The observation made for each test was
recorded in the table.
(i) Complete the statements in the inference column by writing the names or
formulae of the species. - CORRECT-ANSWERSGo to next flash card
Test 1
Aqueous sodium hydroxide was added to solid C and the mixture warmed
The gas evolved was tested with damp red litmus paper
The red litmus paper turned blue - CORRECT-ANSWERSThe gas evolved was
NH3
One of the cations in C is NH4+
Test 2
Concentrated hydrochloric acid was added to an aqueous solution of C
The pink solution turned blue - CORRECT-ANSWERSThe other cation in C is
Co^2+
The formula of the complex ion in the blue solution is [CoCl4]^2-
Test 3
Dilute hydrochloric acid and aqueous barium chloride were added to an
aqueous solution of C
A white precipitate formed - CORRECT-ANSWERSThe white precipitate is
BaSO4
The anion in C is SO4^2-
Use the results of the tests in (a)(i) to give a formula of C. Do not include
water of crystallisation. - CORRECT-ANSWERS(NH4)2 Co (SO4^2-)2
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