Take Our Free Runz: 2019 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 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!
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
Metals are good reducing agents because they readily loose the electron and have negative electrode
(i) Diamond and shinny appearance and glitter
(ii) It is the hardest substance known
(iii) All its valence electron are localised no free one
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
(i) Adding solution to water
(ii) Rusting of iron
Isotopes is the existence of an atom of an element having the same atomic number but different mass number(differences in neutron number)
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
PH is the negative logarithm of hydrogen ion.It shows the degree of acidity or alkalinity of a solution PH=-log10[H ]
(i) It is poisonous to animals and plants
(ii) It causes acid rain
MgBr(s) Cl2(g)->MgCl2(s) (Br(l)
(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.
(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
II. -1 and 1
I. 4H No3— 3e— >NO 2H2O
II. Mass/molar mass = It/πe— * 96500c
0.5/197 = 0.8*t/3*96500
t = 918.46s
(2di) Group 2
The law of conservation of matter states that matter can neither be created nor destroyed but can be changed from one form to another
-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
(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)
(II)Carbon II Sulphide
There will be the formation of metanol.The reaction is endothermic reaction
But n=mass/molar mass
=>Mass of gaseous product=44.29.7025*10^-5/2477.572
From the reaction, the moles of CaCo3 is the same as the mole of Co2; the number of moles of CaCo3
But moles = mass/molar mass
Mass = moles × molar mass
Mass = 1.198×10^-7×100
= 1.198×10^-5 moles
Privacy & Cookies Policy
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.