Chemistry GCE question

WAEC GCE CHEMISTRY
PRACTICAL.
1.What can can cause the condition of specimen A {alkaline soil}?
Answer : when there are excessive quantities of soluble minerals.

B.Which area can specimen A be found?
Answer=>It can be found in arid or semi arid area like desert nud and savanna.

A. Distinguish between aliphatic and aromatic hydrocarbon
B.Identify carbohydrates and giant molecules as constituents of natural products found in plants and animals.

A is a solution of acid {h 1306} A is a solution containing 20.3g per dm^3 of HYDROCHLORIC ACID[HCL].

A) put A into into burrete and titrate with 15 or 25 cm^3 portion of B using methyl of ur pipete.
===============
Tabulate ur burrete reading and
calculate d average volume of acid.

B) from ur result and information given calculate the
1) Concentration of b in moldm-3.
ii)Concentration of A in moldm-3.
iii)Concentration of A in gldm- 3.

CHEMISTRY PAPER 1
(1a) distinguish b/w a strong acid and concentrated acid
(b.) 25cm3 portions of 0.10mol dm-3 solution of sodium trioxocarbonate(iv) were titrated against dilute hydrochloria acid.

THE TABLE BELOW GIVES THE BURRETE READINGS
Final burette reading (cm3) first

Titration was 25.60 second was 30.85

Third was 26.35 initial reading first was 085 second was 5.65 third was 1.50
(1.)name a suitable indicator for d titration n give its color change at d end point
(ii.) Cal d average tire value and hence determine d conc of d acid in mold per dm3.
(iii) state 3 precautions to ensure dat accurate result are obtain 4 d titration

GCE BIOLOGY PRACTICAL EXAM.
(1a)identify the specimens in i &
ii above
anwsa=specimen i is throcic
vertebra anterior view and
specimen ii is lumber vertebra
prosterior view
(1b)identify d parts labeled A-O
in diagram i & ii above anwsa=u
must know all d labeled part.
C) stat two differeces btw spe i n
ii
(d)stat two important of i n ii
[2a]identify the specimen
above .anwsa =sacral vertebra
[b]identify the parts labeled A-K
[c]give three types of movable
joints
[d]state two xteristic of d
specimen
[3a] wat is d aim of d
experimental setup above?
Anwsa =osmosis using in living
tissue [b]name the part labeled
A-B anwsa =sugar solution nd
living tissue.
[c]mention any other material
apart 4rm yam that can b used
to perform d experiment.
[4]adefine the following terms
(i)osmotic pressure
(ii)isotonic solution
(iii)hypertonic solution
(iv)hypotonic solution
(v)plasmolysis
(vi)osmotic potential
(vii)turgidity.
[4]b state 3 conditions necessary
for osmosis to occurs
[5]a using the space below,set
up an experiment to
demonstrate diffusion in a liquid
medium
[5b]what is diffusion?
[5c]state 3 conditions that can
speed up the rate of diffusion.
[6a]wat is the aim of the
experimental set up above
answa=EXPERIMENT TO
DEMOSTRATE TRANSPIRATION
PULL identify the parts labeled A-
F in d diagram [c]define the
following terms i transpiration
pull ii active transport iii root
pressure [c]stat two precautions
that shuld be taken during the