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2017/2018 WAEC GCE/WASSCE GCE Chemistry Questions and Answers both obj and theory



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2017/2018 WAEC GCE/WASSCE GCE Chemistry Questions and Answers both obj and theory



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Reply 3 on :

imageXbrains(Male,22)-

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(2a)Normal salt_ this
is salt formed when a strong base as a
result of complete neutralization. (ii)acid
salt- this is a formed when a strong acid
reacts with a weak base resulting in an
incomplete neutralization in which the salt
formed exhibit aci

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1887 days ago Via Opera Mini 7.0
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Reply 4 on :

imagewixkid33(,)- (2aiii)H2SO (eg)+2NaOH~NO2SO4+2H20 where Na2SO4 is the normal salt formed.H20SO4(Aq)+NaCH~NaHSO4 where (NaHSO4)(aq). (2b) the acidic base indicator- This is reagent capable of giving a colour change when the ph is varied from 0-14 so as to indicate the acidity or alkalinity of the unknown solution. (3a) (i)the standard electrode potentiaqlof the meteal ion on the hydrogen scale is the potential difference (in volts) which exists between the metallic electrode and the standard hydrogen elctrode. (ii) -position of ions in the electrochemical series - concetration of ions -nature of electrode (iii) -it allows ions to pasds from one electrolytic solution to the other
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Reply 5 on :

imageXbrains(Male,22)- (2aiii)H2SO
(eg)+2NaOH~NO2SO4+2H20
where Na2SO4 is the normal
salt
formed.H20SO4(Aq)+NaCH~NaHSO4
where (NaHSO4)(aq).
(2b) the acidic base indicator-
This is
reagent capable of giving a
colour change
when the ph is varied from
0-14 so as to
indicate the acidity or alkalinity
of the
unknown solution.
(3a) (i)the standard electrode
potentiaqlof the meteal ion on
the hydrogen scale is the
potential difference (in volts)
which exists between the
metallic electrode and the
standard hydrogen elctrode. (ii)
-position of ions in the
electrochemical series -
concetration of ions -nature of
electrode (iii) -it allows ions to
pasds from one electrolytic
solution to the other

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Reply 6 on :

imageXbrains(Male,22)- 7ai. Chemical industry is one
that uses chemistry to
make chemicals 4rm oda chemical
substances.
7aii. I. Climate change
ii. Availblity of raw material
iii. Topography
7ci. I. Lime stone
ii. Clay
iii. Water
7cdi. Polution is the relis of
toxic substance to the enviroment by natural forces,man or animals.
7dii. I. Carbon (ii) oxide
ii. Oxide of sulphur.
7bii. I. It is usd in coating
materials
ii. It is used in making of
sheet glases
7bi. SnO2 +2C-->Sn +2co
(use the equatn of explain
and includ the equation).

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Reply 7 on :

imageXbrains(Male,22)- (3a) (i)the
standard electrode potentiaqlof the meteal
ion on the hydrogen scale is the potential
difference (in volts) which exists between
the metallic electrode and the standard
hydrogen elctrode. (ii) -position of ions in
the electrochemical

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Reply 8 on :

imageXbrains(Male,22)- (3b) if a copper
plate is
immersed in a solution of
copper(vi) tetraoxosulphate
solution, Cu (2+) ion acquires
two electrons from the copper
plate to become deposited as
neutral metallic copper on the
plate. a potential difference is
setup betwwen the copper
metal and the solution
containing ions. Cu(2+)(aq)+2e
(-)=>Cu(s) (3c) Cu(2+)+ 2e
(-)=>Cu 2*96500=64g Q=it
Q=0.2*35*35*60 Q=420C
2*96500=64 420 columbs=64
mass=(64*420)/(2*96500)
=0.139g (3d) (i)-it doesnt
participate in reaction -its mass
does not change in reaction -it
alters the rate of chemical
reaction (ii) i- hydrogenation of
oil.

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Reply 9 on :

imagetope4real(Male,18)- (1c) (i) Nuclear fission is the disintegration of heavy nuclei to form light nuclei (ii) Nuclear fussion is the combination of light nuclei to form heavy nuclei (1d) (i)a. alpha -Ray b. beta -Ray c. Gamma- Ray (ii) (I.) alpha < beta < gamma increasing in penetrating power (II.)gamma < beta < alpha increasing in ionizing power. (2b) (II) form and complete the table for- Indicator(methyl orange) - colour in acidic medium(red) -colour in basic medium (yellow) for- Indicator (phenolphthalein) - colour in acidic medium (colurless) -colour in basic medium (pink)
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Reply 10 on :

imagewixkid33(,)- (3b) if a copper plate is immersed in a solution of copper(vi) tetraoxosulphate solution, Cu (2+) ion acquires two electrons from the copper plate to become deposited as neutral metallic copper on the plate. a potential difference is setup betwwen the copper metal and the solution containing ions. Cu(2+)(aq)+2e(-)=>Cu(s) (3c) Cu(2+)+ 2e(-)=>Cu 2*96500=64g Q=it Q=0.2*35*35*60 Q=420C 2*96500=64 420 columbs=64 mass=(64*420)/(2*96500) =0.139g (3d) (i)-it doesnt participate in reaction -its mass does not change in reaction -it alters the rate of chemical reaction (ii) i- hydrogenation of oil.
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Reply 11 on :

imageXbrains(Male,22)- 1a)i)Halogens (ii)
Hydrogen
floride(HF) and Hydrogen
Chloride (HCl) (iii) (a)They are
strong oxidizing agents (b)They
combine with metals eg Mg(s)+
Cl2=> MgCl2(s) (c)They combine
with non metals eg H2(g)+
Cl2(g)=> 2HCL(g)
(1a) (i) Halogen (ii) H F and Hcl
(iii) They react with metal to
form salt
(1b) completing the table for
particle(W^2+), No of nuetron
(12), no of eletron(10),No of
proton(12), Mass Number(24)
for particle(X^2), No of nuetron
(
, no of eletron(10),No of
proton( , Mass Number (16)
for particle(y), No of nuetron
(14), no of eletron(13),No of
proton(13), Mass Number(27)
for particle(Z), No of nuetron
(12), no of eletron(11),No of
proton(11), Mass Number(23)

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Reply 12 on :

imageXbrains(Male,22)- (2bIII)
I. methyl orange
II.methyl orange
III. phenolphathalene

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Reply 13 on :

imageXbrains(Male,22)- (8ai)Each
successive member of a
homologous series differ by
~CH2~group.Members of a
homologous series show
similar chemical
properties.

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Reply 14 on :

imagetope4real(Male,18)- (8biii)C2H5OH
+CH3CH2COOH=CH3CH2COOC2H5
ethylpropanoate

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Reply 15 on :

imagewixkid33(,)- CHEMISTRY THEORY: (1a) (i) Halogen (ii) H F and Hcl (iii) They react with metal to form salt (1b) completing the table for particle(W^2+), No of nuetron(12), no of eletron(10) ,No of proton(12), Mass Number(24) for particle (X^2), No of nuetron( , no of eletron(10),No of proton( , Mass Number(16) for particle(y), No of nuetron (14), no of eletron(13),No of proton(13), Mass Number(27) for particle(Z), No of nuetron (12), no of eletron(11),No of proton(11), Mass Number(23) (1c) (i) Nuclear fission is the disintegration of heavy nuclei to form light nuclei (ii) Nuclear fussion is the combination of light nuclei to form heavy nuclei (1d) (i)a. alpha -Ray b. beta -Ray c. Gamma- Ray (ii) (I.) alpha < beta < gamma increasing in penetrating power (II.)gamma < beta < alpha increasing in ionizing power. Be fast time no dey
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Reply 16 on :

imageSamtokid(,)- (8biii)C2H5OH
+CH3CH2COOH=CH3CH2COOC2H5
ethylpropanoate.

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Reply 17 on :

imagewixkid33(,)- 4) (a) Hygroscopic substance which absorbs moisture when expose to atmosphere (ii) physical changes no change in mass easily reversible Chemical change there is change in mass not easily reversible (iii) Charle's law states that the volume of a given mass of gas at constant pressure is directly proportional to its absolute(kelvin) temperature(2b) (II) form and complete the table for- Indicator(methyl orange) - colour in acidic medium(red) -colour in basic medium (yellow) for- Indicator(phenolphthalein) - colour in acidic medium(colurless) -colour in basic medium(pink)
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Reply 18 on :

imageDunszin363(,)- .....Tnxs......
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Reply 19 on :

imageakere(Male,18)- fanks
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Reply 20 on :

imagesholabishop1(Male,15)- Scrutinise the OBJ very well.Some guys told me there are lots of mistakes.In fact I saw another one completely different from that of ExamLoaded.Pls post a reply.
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