NECO Chemistry Practical Questions and Answers 2020/2021: Download Specimens Answers

NECO Chemistry Practical Questions and Answers 2020 is out and available on our website. Get free NECO Chemistry Practical expo now for free. From this post you will know how NECO Chemistry practical questions are set and ways to tackle the questions appropriately.

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The NECO 2020 Chemistry practical is not difficult, never get discourage yourself, you can make an excellent result out of it.

2019 NECO Practical Chemistry Answers to Questions

NECO Chemistry Practical Questions and Answers

The National Examinations Council (NECO) is an examination body that conducts the Senior Secondary Certificate Examination and the General Certificate in Education and also Responsible for the Setting and marking of NECO Examination and has informed members of the general public to follow the exams guidelines. 

Live NECO Chemistry Practical Answers

NECO Chemistry practical is divided into two parts namely:

  • Quantitative Analysis
  • and Qualitative Analysis

The Quantitative involves titration and test of ions. You will be required to carry out an experiment and report your observation. What you will see will not be far from the Chemistry Specimen given to your exams center.

ATTENTION: Your titration endpoint will be given to you by your Chemistry teacher. It is not the same for every school but within a range.

Qualitative Analysis is a simple salt analysis, you will given the Chemistry Specimens to carry out the experiments and make “INFERENCES”

How to Tabulate your Qualitative analysis

Use the format below for your result.

TESTOBSERVATIONINFERENCE
Ist TestIst ObservationIst Inference
ContinueContinueContinue

SEE ALSO, NECO GCE 2020 Mathematics Answers

NECO Chemistry Practical Specimens Answers 2020

Below are NECO Chemistry Practical Past Questions and Answers that may be repeated

1ai)

Tabulate

Titrations|Rough|first(1)|second(2)|third(3)

Final burette reading – |20.50|14.90|15.00|15.10|

Initial burette reading – |0.00|0.00|0.00|0.00|
volume of Acide used – |20.5|14.90|15.00|15.10|

1ai)

Average volume of Acid used
1st+2nd+3rd/3
14.90+15.00+15.10/3=45/3=15cm^3

1aii)

2HCL(aq)+Na2CO3(aq)—->2NaCl(aq)+H2O(aq)+CO2(aq)

1bi)

CA VA/CB VB =NA/NB
0.1moldm^-3*15cm^3/CB*25cm^3 *2/1
CB * 25cm^3*2=0.1moldm^-3*15cm^3*1
CB * 50=1.5
CB=1.5/50=0.03moldm^-3

1bii)

25cm^3—->0.03mole
1000cm^3—->x
x=1000*0.03/25=30/25
x=1.2moldm^-3

1biii)

concentration in mold^-3 =Con glm^3 /molar mass
0.03moldm^-3=x/106
x=0.03*106
x=3.18gldm^3

================================

2a)

Tabulate

2ai)

OBSERVATION

i) C dissolves in water
ii) formation of white precipitate
iii) White precipitate dissolves in itel

INFERENCE

i)C is soluble in water
ii)CO3^-2,SO4^-2,SO3^2- suspected
iii)CO3^2-,SO3^2-, suspected

2bi)

OBERSVATION

i)effervescence occurs with the evolution of a gas

ii)the solutions turns to pink

INFERENCE

i)CO3^2-,SO3^2-, suspected
ii)CO3^2-,Confrimed

================================

3ai)

Zinc chloride reaction with HaOH form white gelatinous precipitate solution in excess HaOH.

Ammonium trioxocarbonate(iv) on reaction with HaoH evolves a gas which turns red litmus paper blue and lime water milky.
Calcium trioxocarbonate(iv) on reaction with HaoH forms white powdery precipitate insoluble in excess HaOH.

3aii)

i) Boiling point to determine the purity in a liquid substance and

ii) Melting point to determine the purity in a solid substance

3bi)

Different between boiling n evaporation

Boiling

1. A process in which a substance changes its state from the liquid state to the gaseous state

2. Occurs throughout the liquid

Evaporation

1. A process in which a substance changes its state from the liquid state to the gaseous state without boiling

2. Takes place only from the exposed surface of the liquid

3bii)

Carbon dioxide is use to extinguish fire because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly.

3ci)

A 1 molar solution is a solution in which 1 mole of a compound is dissolved in a total volume of 1 litre. For example: The molecular weight of sodium chloride (NaCl) is 58.44, so one gram molecular weight (= 1 mole) is 58.44g.

3cii)

Acid Base indicators

3ciii)

i)methyl orange
ii)Phenolphthalein.

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How to Pass NECO Chemistry Practical Specimens Questions

Proper Preparation

Preparation is the key to Success, anybody looking for any other way to pass the Practical apart from good preparation is looking for a way to fail. seat tight and study your books and pass NECO Chemistry Practical can never be a problem for you.

Use Good Chemistry Practical Handbook and manual

There is nothing good as a sound Practical Chemistry manual. The manual and handbook are your companions. Make good use of the Chemistry Practical manual in addition to your laboratory note and you will see yourself solving complex Chemistry Practical questions. One manual is not enough, some manuals make topics that seems to be hard in others simple. You are advised to make manual your companion.

Adhere to instructions

Any candidate they refuse to adhere to the Examination Instructions is planning to fail. The instructions there are for you not for the invigilators. Adherence to instructions gives you a better chance of passing Practical Chemistry 2020.

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