Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

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Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

As a matter of fact in this post we shall be giving you Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo published for students who is searching for guidelines to pass the upcoming Chemistry examination scheduled for next week. Please read more.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo – Furthermore this post is majorly for students who have not read well in the past few weeks, therefore we have taken our time to reach you all in such a manner that you would not have to stress your self again.

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Similarly, the Essay & Objectives Theory NECO Chemistry 2017 answers has been published on this page to assist students who wants to use it to study.

IMPORTANT WARNING: The answers in this post is just for student to refresh their memory and keep them up to date.  Furthermore as a matter of fact this is not presently the 2017 NECO exam answers.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Below are current dates for Neco exam 2017 (As a matter of fact for students who are not updated)

Date for Writing NECO Chemistry Exam 2017
========================================
Chemistry 2 (Essay) Thursday 6th July: 10am – 1pm
Chemistry 1 (Objective) Thursday 6th July: 10am – 1pm
========================================

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Get ESSAY/ THEORY ANSWERS BELOW – Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo ;

2017 NECO Chemistry Questions and Answer Expo.

1. first and foremost – neco chemistry Answer 2017
2. above all -neco 2017 Questions & Answer
3. finally -neco practical specimen for all subject
4. above all -neco chemistry 2017 expo past questions
5. similarly – NECO biology practical 2017

As a matter of fact Neco Answers have been randomly published in this post basically to avoid student copying inside the exam hall.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Question 3
3b)
In other words the oil is stained red. This is a specific test for fats if suden (iii) is added to fats a distinct red colouration is observed

3c)
Given 2502+02+2H20—>2H2SO4
1mole produce 2mole
1.3mole produce 3mole
moles of H2SO4=3mole
molar mass of H2SO4=(1+2)+32+(4*16)
=2+32+64 = 98gmol-^1
mole=mass/molar mass
mass and H2SO4=Mole*molar mass
=3*98 =294g

3di) DH2

Question 4
4ai) Thermal cracking
4aii) C4H8
4aiii)

(I) H H. H
| | |
H-C-C-C=C
| | | |
H H H H
and
(II) H H
| |
H-C-C=C-C-H
| | | |
H H H H

4aiv)
I-normal butene
II -But-2-ene
Ni

4av)
C4H8 +H2 ——-> C4H10
250c.

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4b)
method
– rub the fat on a blank white paper
– pour Sudan (III) dye over the paper
-wash the paper under tap.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Observation
First and foremost – rubbing the fat on the paper produces a translucent color
Furthermore -pouring sudan (III) will stain the blot red

Conclusion
Finally – fat is present because sudan (III) can stain fat red.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

Question 5
5bi)
C(s) + O2(g) =====> Co2(g)
Co2(g) + C(s) =====> 2Co(g)
Fe2O3(s) + 3Co(g) =====> 2Fe(l) + 3Co2(g)

The limestone present decomposes as follows:
CaCo3(s) =====> CaO(s) + Co2(g)

Which is available to remove silicon(iv) oxide impurity
SiO2(s) + CaO(s) =====> CaSiO3(s),

Question 3
1ai) An acid base indicator is a weak acid or weak base that exhibits a colour change as the concentration of hydrogen (H^+) or hydroxide (H^-) ions changes in an aqueous solution.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

1aii) Methyl-orange

1b)
i) Oxidizing agent
ii) Mixed anhydride.

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1ci)
Enthalpy of combustion is the heat evolved when one mole of a substance is completely burns in oxygen gas under standard conditions

1cii)
Enthapy of combustion is always negetive since it involvs a rise in temperature and heat of reactants is greater than the heat of products

1d)
Primary cell is a cell that cannot be re charged while secondary cell is a cell that can be recharged

1dii)
primary cell — daniell cell
secondary cell — lead accumulator

1e)
Mole is the unit of measurement in the International System of Units (SI) for amount of substance. The unit is defined as the amount of a chemical substance which contains as many representative particles, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope of carbon with relative atomic mass.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

1f)
n= V=40cm^3
c= 0.40moldm^3
n=cv/1000
0.40*40/1000 = 0.016mol

1g)
i) Platinum
ii) Carbon

1h)
i) Hydrogen bonds
ii) Vander waals forces

1i) Water(H2O) and Carbonmonoxide (Co)

1j) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

5bii)
Faraday’s first law of electrolysis states that, the mass (m) of an element discharged during an electrolysis is directly proportional to the quantity of electricity (Q) passing through it.

Chemistry Past Obj Answers: No Questions at all
01 – 10 = ACDBCBDBCA,

11 – 10 = DBAADCDBCB,

21 – 20 = DBCBCCDBAD,

31 – 30 = BACBACBCCD,

41 – 50 = BDACABDABD.

Complete NECO Chemistry Past Questions & Answer 2017 | Essay & Objectives Expo

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