2020/2021 NECO Chemistry Practical Answers to Questions: Sure Specimens Answers

2020/2021 NECO Chemistry Practical Answers to Questions OBJ/Essay. Are you among the candidates that Registered for The NECO 2020/2021 Exams and you are online googling NECO 2020 Chemistry Practical answers, NECO chemistry practical 2020, NECO Chemistry Practical expo, 2020 NECO answers to Practical Chemistry, NECO 2020 Answers? Your problem is solved as long as this page is involved. Keep reading.

NECO Chemistry Practical Answers to Questions 2020

2019 NECO Practical Chemistry Answers to Questions

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SEE ALSO, NECO GCE 2020 Mathematics Answers

NECO 2020 Practical Chemistry Answers

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.

How to Answer NECO 2020 Chemistry Practical Questions

Student Looking for NECO chemistry practical Answers are advised to adopt the following

Proper Preparation

Preparation is the key to Success, anybody looking for any other way to pass NECO 2020  Chemistry 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 to you.

Use Good Chemistry Practical Handbook and manual

There is nothing good as sound Practical Chemistry manual. The manual and handbook are your companions. Make good use of 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.

Prayer

Pray is the key is the master key, never rely solely on your own effort, God is there to help you. Your prayer to the Almighty God will open the door of Success in your Exams. Believe in God your creator and all your problems is over.

Time Management

Time management is very important as long as NECO 2020 Practical Chemistry is concerned. Make sure you don’t waste time when attempting any question. Answer Questions You Know better before proceeding to try others. Be mindful of the time given and the number of questions you are to answer before the time elapses.

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 NECO Practical Chemistry 2020.

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