Chemistry · May / June 2025 · Paper 42 · Question 6
0620
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The question as text
Ethene, C2H4, is the first member of a family of similar compounds which contains the alkene functional group.
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6(a)[1]
homologous series
6(b)[1]
14
6(c)[2]
C2H4 + 3O2 → 2CO2 + 2H2O
M1 CO2 + H2O
M2 correct equation
6(d)(i)[4]
M1 decreases
M2 decreases
M3 decreases
M4 no change
6(d)(ii)[3]
M1 kinetic energy of particles increases
M2 frequency of collisions between particles increases
M3 higher percentage / proportion / fraction of collisions / particles have energy greater than / equal to activation energy
6(e)(i)[1]
C5H6O4
6(e)(ii)[1]
it has a carbon-carbon bond which is not a single bond
6(e)(iii)[2]
M1 one C – C single bond with continuation bonds
M2 correct structure
6(e)(iv)[1]
compound B has two carboxylic acid groups
6(e)(v)[2]
M1 (mol of NaOH reacting) = 0.2(00)
M2 volume = 1000 × 0.2(00) / 0.250 = 800 cm3
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