cameroon gce A level June 2024 chemistry 2
cameroon gce A level June 2024 chemistry 2
SECTION A: PHYSICAL AND GENERAL CHEMISTRY
1 .
(a) The half-life of the radioactive isotope lead-210 is 19.7 years,
(i) What is half-life?
(ii) How long will it take for a sample of the isotope to decay to 15% of its original value?
(4 marks)
(b) (i) Define order of reaction with respect to a reactant.
(ii) Sketch a graph of rate against concentration of a zero, first and second order reaction on the same grid.
(4 marks)
(c) Define the following and give a suitable example of each ,
(i) Homogeneous catalyst.
Study the reaction scheme below and answer the questions which follow.
C4H,Br I • •
A C4II, II C4H8Br2
13 C
111
IV
CH,(CH2)JOH
C.,H9CI
D
(i) Give the reagents and reaction conditions for the steps represented by i to iv.
Reagcnts(s) Reaction conditions
1
11
in
I V
(ii) Give the structures of compounds A to D
A B C D
What rule governs the formation of compound D from B?
(9 marks)
(b) The compound C4H|oO exhibits isomerism,
(i) What is isomerism?
(ii) Give all the position isomers of the compound.
The amino acid, amino cthanoic acid (NINCIl2COOII) has both acidic and basic properties. In neutral solution
it forms a zwittcrion.
(i) What is a zwittcrion? •
(iii) State the type of reaction taking place when two molecules of aminoethanoic. acid combine. .
(jive the structure of the product.
•• f «
(6 marks)
(c) Give the systematic names of the following compounds,
(i) (Cll3)2CIl=CI:l(C2l–l5)CH2CH3 .hfuiocunoy fill o idurtnoi ‘ifilu’jjlorn;rb yfninr.*r.O (ii )
1 * i
(ii) CH,CH=CHCH(CH,)2
(2 marks)
(d) State the specific type of organic reaction mechanism taking place in the following conversions,
(i) CeHft MCU /CA UC^ C\,IIsCH.V’0 ‘ * nr > J 3f,t ni n^oitin to 99fi9anq 9»wl IP ji uoy uR‘j v/ol * (iii\
‘ (ii) CM., Gh/UV light- CHiCI + IICI
(iii) ClI,Cl10 IICN > “CHjCH (CN)Oll
( r’d’W.i l 1
(iv) (Clli)iCBr QHVreflux
^ (CH,)jCOII
(4 marks)
(TOTAL = 20 marks)
