Keep Subscribing With Us For Your Next
Subject @ www.solutionfans.com To Enjoy Our Service And Get Your Legit. Solution Night Before Exam Time.
NECO-CHEMISTRY-ANSWERS You Are To Answer Four (4) Questions
Only. We Answered. FIVE (5) Pls Answer Four(4). Enjoy And Tell People About Us.
(i)The property of elements are a periodic function of their atomic number
(ii)Elements are arranged in the periodic table according to the order of increasing in their atomic weight.
Periodicity can be defined as the trend or recurring variation in element properties with increasing atomic number.
using; mole = no; of atoms/avogadro’s constant
0.5=no; of atoms/6.023*10²³
no; of atoms = 0.5*6.02*10²³=3.012*10²³atom
Faraday’s first law of electrolysis state that the chemical deposition due to the flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it.
(i)Boyl’s law states that the volume of a given mass of gas is inversely proportional to its pressure, provided the temperature remains constant.
(ii)V1/T1 = V2/T2 i.e V2 = V1T2/T1
= 400 x (273+150)/(273+30)
Volume at 50°c = 400×323/303 = 426.4cm^3
(I)Burning requires heating while corrosion does not
(II)Boiling occurs at a certain temperature while evaporation occurs at all temperature
A concentration solution can be defined as a solution formed when a large quantity of a substance dissolves in a little volume of water
(i)position of ion in electrochemical series
(iii)nature of electrodes
(I)acidic — NO² nitrogen (iv) oxide
(II)neutral — NO nitrogen (ii) oxide
HCOOH. H²SO⁴/H²O CO(g)
46g of HCOOH = 22.4dm³ of CO
600g of HCOOH = X
X= 600*22.4/46=2.92dm³ of CO(s) is produced.
(i)To standardize a solution of an acid or base
(ii)To determine the percentage purity and impurity of an acid of a base
FeCl²(s) + 2NaOH(aq) —-> 2NaCl²(aq) + Fe(OH)²(s)
The main product is sodium chloride and iron (II) hydroxide
(II)iron (ii) chloride
(I)it is slightly denser than air
(II)it is slightly soluble in water
Because on exposure to air of rust due to the formation of hydrated iron (iii) oxide. In other words rusting it changes to reddish brown flaky powder is formed with new properties and irrversable permanent change.
Fe(s) + 3O³(g)+ XH²O(s) —> 2Fe²O³ XH²O(s)
Mas of dry hydrogen =35g
Mass of dry hydrogen + oxygen vapour of a compound= 440g
Mass of organic vapour of the compound = 440g-35g=405g
V.D of the vapour =mass of vapour/mass of equal volume of H²
405/35 =11.51 ≅ 11.6
V.D = 11.6
R.m.m of the vapour =V.D *2
(ii)Enthalpy change value
Polymerisation can be defined as the arrangement of smaller nuclei to form a large nuclei
Comments, Pictures and culled stories posted on this website will be given due credit and is not the fault of Solutionfans.com if they are given original credit from site culled from. If you have a complaint or a story, Please Send To Us Via [email protected]