Earboard Logo

Welcome, Guest: Join Earboard / LOGIN! / Advertise / Join Earboard Affiliate /Contacts / News
Stats: 4041 members, 31659 topics. Date: Sunday, 21st October 2018


HOME NEWSLETTER GENERAL NEWS TECHNOLOGY EDUCATION AFFILIATE
Click Here to Receive Our Next Post via Email ...
 

2017 WAEC GCE Chemistry Answers

Vocational Training Is The Answer To Unemployment Among The Youths / A Letter to My Sister Giving Her Three Reasons Why I dislike My New School / Reasons Why Teaching Is A Lucrative Profession /

(0) (Reply) (Go Down)

2017 WAEC GCE Chemistry Answers by : 2:43 pm On September 18, 2017

2017 WAEC GCE Chemistry Answers

Click Here to Enter Password

OBJ
1-10 CADCDCBABD
11-20 DDDCBBBACC
21-30 DDACABABAC
31-40 DDBDADBBDA
41-50 BBDCDBDCBA

(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

(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

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)
-Gases are randomly in a straight line colliding with one another and to the volume of the cylinder
-The volume occupied by the gas molecules are highly negligible when compared to the volume of the container
-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

Take Our Free Runz: 2017 WAEC GCE Chemistry Theory and Obj Answers will be posted here for free but 60 minutes after exam starts.
Take Our Paid Runz: With N400 we will send you the password to view all the answers 3 hours before exam starts. To make payment, simply buy MTN Recharge card of N400 and send it to 09067385575 . You can also do transfer to the number.

How to send the card: Type the card pin, your subjects & phone number and send to 09067385575. You can also call or message the above number for more details.

Why we are the best? We give you 24/7 customer support. We give you another subject for free if you didn't get the answers for the one you paid for. We offer the cheapest Runz (N400 per Subject, N2000 for 5-9 Subjects and N4000 for all our runz). Our answers are real and genuine. We also give free Runz to candidates who cannot afford our paid Runz. Where else on the internet can you get this kind of service? Subscribe now and enjoy while it lasts!

Refresh this page 60 minutes after exam starts for our Free answers.

Click Here to Refresh

0

Publication author

offline 2 months

Editor

7

I am the brain behind Earboard.com

Comments: 41Publics: 581Registration: 13-02-2017

Leave a Reply

(0) (Reply)

Vocational Training Is The Answer To Unemployment Among The Youths / A Letter to My Sister Giving Her Three Reasons Why I dislike My New School / Reasons Why Teaching Is A Lucrative Profession /

 

(Go Up)


Sections: News (1) Technology Education (2)

Links: (0) (1) (2) (3) (4) (5) (6) (7) (8) (9)

Earboard - Copyright @ 2016 - 2018 George Gosmooth. All rights reserved. See How To Advertise.
Disclaimer: Every member is solely responsible for anything that he/she posts or uploads on Earbaord.

%d bloggers like this: