2017 waec gce chemistry objectives & theory questions & answers expo runz now posted free

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2017 waec gce chemistry objectives & theory questions & answers expo runz now posted free

2017 waec gce – waec gce chemistry runz / expo /answers now available.Currently speaking, we have all questions and answers for 2017 Nov/Dec Waec Gce Chemistry free expo runz .Only on Bmasterz.com

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2017 waec gce chemistry objectives & theory questions & answers expo runz now posted free
2017 waec gce chemistry objectives & theory questions & answers expo runz now posted free 

Today, you will be expecting verified accurate 2017 waec gce chemistry runz on this site, but before we release the obj and theory questions and answers for today’s chemistry runz expo, we shall make sure that all those who subscribed gets it first by 7am as usual.

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      Apparently, we shall post free gce Chemistry runz , chemistry answers on this page when its 30minutes to go from exam hall.This is to make sure that those who paid for our gce runz did not regret it.

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          Subjects for Tuesday, 19th September, 2017
Chemistry 2 (Essay) >> 9.30am – 11.30am


Chemistry 1 (Objective) >> 11.30am – 12.30pm


Government 2 (Essay) >> 2.00pm – 4.00pm


Government 1 (Objective) >> 4.00pm – 5.00pm


Basic Electronics 2 (Essay) ** >> 2.00pm – 3.00pm Basic Electronics 1 (Objective) ** 
>> 3.00pm – 4.00pm






ANSWERS WILL APPEAR HERE 30 MINUTES TO GO FROM HALL.KEEP REFRESHING……….

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HERE ARE VERIFIED ANSWERS FOR 2017 GCE CHEMISTRY

Chem Obj
1.CBDADCBABD 
11.BACCBBADCC
 21.DCACABABAA 
31.DDBDADBBDA 

41.BBACDBDCBA



(1a) 
A Standard Hydrogen Electrode (SHE) is an electrode that scientists use for reference on all half-cell potential reactions. It is a redox electrode which forms the basis or reference of thermodynamics scale of oxidation or reduction potential

(1b)
Metals are good reducing agents because they readily loose the electron and have negative electrode

(1c)
(i) Diamond and shinny appearance and glitter
(ii) It is the hardest substance known
(iii) All its valence electron are localised no free one

(1di)
Chemical change:Is a change that produces new kind of matter and needs heat or spark to happen and is not reversible and is affected by change of mass

(1dii)
(i) Adding solution to water
(ii) Rusting of iron

(1e)
Isotopes is the existence of an atom of an element having the same atomic number but different mass number(differences in neutron number)

(1f)
A weak acid is one that does not ionized completely in water, a dilute acid is one with low concentration it can be weak acid or strong acid but has plenty of water

(1g)
PH is the negative logarithm of hydrogen ion.It shows the degree of acidity or alkalinity of a solution PH=-log10[H+]

(1h)
(i) It is poisonous to animals and plants
(ii) It causes acid rain

(1i)
MgBr(s)+Cl2(g)->MgCl2(s)+(Br(l)

(1j)
(i) By distillation
(ii) By adding preservatives such as sodium benzonoate

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                      2ai) it’s a group of atoms or type of bond possessed by certain organic compounds making them have some or similar chemical properties. 

(2aii)
I. Ester
II. Ethyl ethanorate

(2bi)
(I). Unsaturated hydrocarbon
(II). Alkanol
(III). Alkanoic Acid 

(2bii)
(i) Acidified KMnO4 turns from purple to colourless 
(ii) A sweet smelling compound is produced 
(iii) Effervescence occurs with colourless odourless gas that turns lime water milky being evolved 

(2ci) 
I. O
II. -1 and +1

(2cii)
I. 4H+ + No3— +3e— >NO + 2H2O
II. Mass/molar mass = It/πe— * 96500c
0.5/197 = 0.8*t/3*96500
t= 0.5*3*96500/197*0.8
t = 918.46s

(2di) Group 2
(II) X3N2
(III) Beryllium

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no4a)The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed.

(4ai)
The law of conservation of matter states that matter can neither be created nor destroyed but can be changed from one form to another

(4aii)
(i) Gases are randomly in a straight line colliding with one another and to the volume of the cylinder
(ii) The volume occupied by the gas molecules are highly negligible when compared to the volume of the container
(iii) The collision between the gas molecules are perfectly elsatic

(4b)
(i)Producer gas(Mixture of CO and N2)
(ii)Water gas(Mixture of CO and H2)
(iii)H2)(g)+C(s)->CO(g)+H2(g)

(4ci)
(I)Benzene
(II)Carbon II Sulphide
(III)Tarpentine

(4cii)
There will be the formation of metanol.The reaction is endothermic reaction

(4di)
CaCO3->CaO+CO2

(4dii)
(I) p=120Nm^-2=118.81atm
V=0.25dm^3
R=8.314JKmol^-1
T=25C+273=298K
Using PV=nRT
=>n=PV/RT=(118.81*10^-5*0.25)/(8.314*298)
But n=mass/molar mass
=(29.7025*10^-5*)/(2477.572)
=>Mass of gaseous product=44.29.7025*10^-5/2477.572
=527*10^-6g

(II)
From the reaction, the moles of CaCo3 is the same as the mole of Co2; the number of moles of CaCo3
= 1.198*10^-7mole
But moles = mass/molar mass
Mass = moles × molar mass
Mass = 1.198×10^-7×100
= 119.8×10^-7
= 1.198×10^-5 moles.

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