NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO
Presently NECO TOP CHEMISTRY 2017 ANSWERS & EXPO| Questions & Answers Expo – OBJ Essay Theory Expo – These are the searches related to NECO Chemistry Answers: neco 2017 biology; finally neco chemistry practical answers; neco chemistry 2017; 2017 neco chemistry practical;above all  neco answer for mathematics; finally neco expo free; neco examination time table; neco answer online.

Finally NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

First and foremost, let me say hello to every student participating in 2017 NECO exam. This is the NECO Chemistry 2017 Objectives & Theory questions and answers we promised you that we will publish real soon.

As a matter of fact, it is intended for students who is looking for guidelines online to pass the upcoming Chemistry Objective and theory examination scheduled for Thursday 6th July 2017 which is few days from now.

Meanwhile, remember we wrote an article on NECO Chemistry Practical Specimen 2017 Past Question and Answer for school candidates writing NECO Chem practical.

Complete NECO TOP CHEMISTRY 2017 ANSWERS & EXPO | Questions & Answers Expo

Correspondingly, all the complete Essay & Objectives Theory NECO Chemistry 2017 real answers has been published on our webpage to assist students who wants to use it to study and have knowledge of real answers.

Above all NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

WARNING: This is not the current NECO exam answers 2017. DO not use it as expo for examination malpractice because you will fail. Its for study purpose only.

+++++++++++++++++++++++++++++++
Tuesday, 06th July, 2017
Chemistry (obj and essay) 10.00am
+++++++++++++++++++++++++++++++

Above all NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

CHEMISTRY OBJ ANSWERS: PAST QUESTIONS & ANSWERS
First and foremost – 1-10: ADCCADAADA
Afterward – 11-20: DCCBADDBCC
Furthermore – 21-30: CBAACDDDAB
Finally – 31-40: CACCBDDADB
Above all – 41-50: ADBCDADBBA

Similarly – CHEMISTRY OBJ ANSWERS: PAST QUESTIONS & ANSWERS.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

Question 1a)

• i)first and foremost – they are relatively of low cost
• ii)finally – They have high heat resistance

1bi)
draw the structure
H H
H-C-C-H
Br Br bromoethane

1bii)

• bromoethene.

1c)

• Because Ethanol is less denser than water

1di)
Le Châtelier’s principle, states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components, the system will tend to shift its equilibrium position so as to counteract the effect.

Complete NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

1dii)

• i)F2+2NaOH—–>NaOF+NaF+H20
• ii) finally Cl2+2NaOH—–>NaOCl+NaCl+H20

1dii)

• i)K2SO3 has been oxidized
• ii)finally Ag^2+ has been oxidized

1e)
dynamic equilibrium is a steady state reached when a reversible reaction occurs at the same rate in both directions and has an unchanging ratio of products and reactants.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

1f)

• diagrams (k)** (k)** (2) (k)** (k)**

1g)

• because it attains equilibrium at very fast rate

1hi)

• i) electrovalent bonding.
• ii) finally covalent bonding

1hii)
Aufbau principle states that hypothetically, electrons orbiting one or more atoms fill the lowest available energy levels before filling higher levels (e.g., 1s before 2s).

In this way, the electrons of an atom, molecule, or ion harmonize into the most stable electron configuration possible.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

1i)
The outer electron in aluminium is in a p sub-level. This is higher in energy than the outer electron in magnesium, which is in an s sub-level, so less energy is needed to remove it.

1j)

• i) Substitution
• ii) Addition

Question 2ai)

• Vander waal’s force are weak intermolecular gases at room temperature.

(2aii)

• Electro-negativity difference
• above all -Ionization energy

(2aiii)

• Ionization energy
• above all -Electron affinity.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2b)

• C-F and C-O.
• Finally C-N and C-H-O and C-N and C-F and C-O.

Complete NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2ci)

• Be = 1S^22S^2
• 4Mg = 1S^22S^22P^63S^2
They both have the same number of electron in the outermost shell

(2cii)

• Mg^2+->Na^+->Ne
• The size of positive ion is less than that of the neutral atom.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2bii)

• C-F>C-O>C-N>C-H(order of polarity).

(2ci)

• 4Be=1S^2 2S^2
• 12mg =1S^2 2S^2 2P^6 3S^2.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2cii)
4BE and 12Mg have similar chemical properties because they belong to the same group in the periodic table. Both 4Be and 12Mg belongs to group II in the periodic table hence they have similar chemical properties.

(2di)
Transition element: Transition elements are those element with partially or incompletely filled d-orbital. Transition metal form coloured ion (or compound), they acts as catalyst,they have variable oxidation stat, they are paramagnetic, they form complex compound or coordination compound.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2dii)

Most transition metals have variable oxidation state because they undergo bonding with the electron in the ns and (n-I) d-orbital .e.g. most of the first series of transition metal from scandium to Zinc have variable oxidation state because they undergo bonding with electron in 4s and 3d- orbital.

(2diii)

• (i) Metals are used in electroplating
• (ii) Metals are used in making electronic cables and cooking utensils because they are good conductor of heat and electricity.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(2div)
It is used in electroplating and galvanizing to make electrical cable.

Question 3ai)
Crystallisation is a separation technique that is used to separate a solid that has dissolved in a liquid and made a solution. The solution is warmed in an open container, allowing the solvent to evaporate, leaving a saturated solution.

(3aii)
Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure.

Complete NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(3aiii)
Filtration is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

(3bi)

• (i)First and foremost Their Melting and Boiling Points increases down the group
• (ii)Their atomic Radius increases down the group
• (iii)Finally Their Ionization Energy: decreases down the group

(3bii)

• 4NaOH(aq)+2F2(aq)->4NaF(aq)+O2(g)+2H2O(l)
• Cl2(g)+2NaOH(aq)->NaOCl(aq)+NaCl(aq)+NaCl(aq)+H2O(l).

Complete NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(3ci)
Gas is a state of matter while vapour is the gaseous state of substance in equilibrium with its liquid or solid state

(3cii)
Normal temperature and pressure

(3di)
Mg(s)+Cl2(g)->MgCl2(s)

(3dii)
first and foremost n=mass/molarmass
n=24/35.5
n=1.2/24
finally n=0.05
number of moles=volume used/molar volume
0.05=V/22.4
V=1.12dm^3

Complete Real 2017 NECO Chemistry OBJ Theory Essay | Questions & Answers Expo

(3e)

• Atomic number is the number of protons present in an atomic nucleus of the element
• Mass number of an element is the sum of the protons and neutrons in the atomic nucleus of the element

(3f)
diagrams ( k )** ( k )** ( 2) ( k )finally ** ( k )**

(3g)
Because it attains equilibrium at very fast rate

Question (4ai)
Hard water is water which does not lather readily with soap. Hard water is formed when water percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.

Complete Real 2017 NECO Chemistry OBJ Theory Essay | Questions & Answers Expo

(ii)

• Temporary hardness: Ca(HCO3)2
• Permanent hardness: Na2C03

(iii)

• By using chemicals like caustiic sodcurrentschoolnews.com.
• By using permutot OR zeolite.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

(4bi)

• (i) coagulation
• (ii) sedimentation
• (iii) filtration
• (iv) chlorination/disinfection.

(4bii)

• (i) Sodium chloride
• (ii) Potassium chloride
• (iii) Chlorine dioxide

(4ci)
Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent.

NECO TOP CHEMISTRY 2017 ANSWERS & EXPO

 

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