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NECO Chemistry Questions and Answers 2022 (100% Sure) Theory & Obj Expo Answers

NECO Chemistry Questions and Answers 2022  is now release for the June/July 2022.  NECO Chemistry Theory and Objective Answers (100%legit) Chemistry Essay verified Free  (Expo) for National Examination Council. NECO Chemistry Questions For you to have good NECO result in  Chemistry as well as repeated questions for free in this post. You will also understand how NECO Chemistry questions are set and how to answer them. The National Examination Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and November/December respectively.

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(1ai) (i) KAl(SO₄)₂. 12H₂O (ii) Na₂SO₄

(1aii) Number of moles of sodium reascted = reacting mass/molar mass = 3.6/23 = 0.1565moles Number of moles of oxygen reacted = (1/4) x Number of sodium = 1/4 x (3.6/23) = 0.03913 Reacting mass of oxygen = Number of moles x molar mass = 0.03913 x (16×2) = 1.252grams

(1bi) Air in gaseous form is first passed through caustic soda to remove CO₂. It is compressed and cooled until ut becomes a liquid at -200°C. It is then led to a fractionating column. On distillation, Nitrogen which has a lowet boiling point of -196°C is evolced first leaving behind Oxygen in liquid form. Further heating converts the liquid to a gas at -183°C.

(1bii) (i) It is used for combustion (ii) It is used for artificial respiration

(1biii) This is because room temperature is warmer

(1biv) (i) Methyl orange (ii) Phenophthalein

(1ci) An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.

(1cii) HCl gas doesn’t contain ions

(1cii) (i) Noble gases: Neon, Helium (ii) Halogens: Iodine, Fluorine (iii) Alkaline earth metals: Calcium, Magnesium

(1civ) Halogens attain stable octet configuration by accepting an electron from donors Group I elements.

(1di) A sol is a colloid where solid particles are dispersed in liquid medium.

(1dii) Jelly

(1diii) (i) Acid-base titrations are used to determine the percentage purity of a substance (ii) Acid-base titrations are important to determine the number of water molecules in a hydrate.

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Do you need Nigeria's National Examinations Council (NECO) Chemistry Past question 2022 Free? If Yes, you are in the right place, we provide complete NECO Chemistry past questions for download on our website. Do you need a platform where you can get all NECO Chemistry past questions? If yes, We have all the related past questions you need, just click on your desired past question and download it to your device.

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Table of Content

What is NECO

NECO stands for Nigeria's National Examinations Council (NECO). The Senior Secondary Certificate Examination and the General Certificate in Education are conducted by Nigeria's National Examinations Council (NECO) every June/July and December/January of the year, respectively.

NECO Vision

To become a major player in the global assessment industry.

NECO Mission

To deliver examinations whose results are trusted worldwide for their credibility.

NECO Core Values

Redefining the future of the Nigerian child through quality assessment.

History of NECO

The formation took place 23 years ago in April 1999. It is an examination educational body that operates only in Nigeria but the result can serve a purpose inside and outside Nigeria. Abdulsalami Abubakar, a former head of state, created NECO in April 1999.

NECO Official Website

For more information, you can visit the official website of NECO: https://www.neco.gov.ng

Importance of NECO Examination

  • You can submit it to apply for higher education
  • You can get a Job using the certificate
  • It is acknowledged globally
  • Numerous universities accept NECO Exam result

Things Needed To pass NECO Examination

  • NECO Past Questions: Candidates will need to have past questions, so as to have an idea about the kind or level of questions that are asked in NECO. This is the reason why Myschoolbrod is here to supply you with complete NECO past questions.
  • NECO Tutorial Videos: NECO tutorial videos will help candidates to have a better understanding of each question and topics related to it that may likely come in the examination. Are you really feeling like watching the NECO Tutorial video? Just click on this link, and immediately you will be taken to Myschoolbrod YouTube Channel so that you can watch the NECO Tutorial videos we have uploaded. Click Here
  • Stationery: Candidates that will partake in the NECO examination will have to get some stationery like pencils (HB), a mathematical set, a Calculator e.t c.

Easy Steps to Pass NECO Examination

  • Have the mindset that you want to take the NECO exam.
  • Overcome Exam Fear (Exam Phobia)
  • Create enough time to study before the examination
  • Make sure you read and study all topics associated with each subject you are taking for the NECO Examination. Click Here to go to Myschoolbrod YouTube Channel , to watch more educational videos needed to pass NECO Examinations
  • Study and read all necessary past questions on the NECO exam. You can download past questions on our website, Click Here to Download

How to check NECO Result

To check NECO results, check the easy steps given in this post where we explained in detail step by step how you can check your NECO result online. Click here to check easy steps to check NECO results online

About Chemistry

   Chemistry is a science subject that researches elements and compounds' properties, compositions, and structures, as well as the way they can change and the energy that is released or absorbed during those changes.

   Chemistry is one of the important subjects you have to pass as a science student in WAEC. Remember for you to pass WAEC, you have to treat essential topics. Chemistry has a lot of definitions that differ as a result of the source but know that every definition still has the same meaning or passes the same information. 

   Some of the world's great Chemist are Marie Curie, Dmitri Mendeleev, John Dalton, Amedeo Avogadro, Alfred Noble, Robert Boyle, Ernest Rutherford, William Ramsay, Alice Ball, Harold Urey, Rosalind Franklin, Mario Molina, Louis Pasteur.

Important Topics In Chemistry

For you to pass WAEC, you have to treat important topics, so here are the important topics in the Chemistry needed to pass WAEC:

  • Stoichiometry
  • Laws of definite and multiple proportions
  • Law of conservation of matter
  • Gay Lussac’s law of combining volumes, Avogadro’s law
  • Chemical symbols
  • Formulae, equations and their uses
  • Relative atomic mass
  • The mole concept and Avogadro’s number
  • Chemical combination
  • Kinetic theory of matter and Gas Laws
  • Vapourization
  • Environmental Pollution
  • Acid, Bases and Salts
  • Oxidation and Reduction
  • Electrolysis
  • Chemistry and Industry
  • Metals and their compounds
  • Energy changes
  • Organic Chemistry
  • Chemical Equilibrium
  • Chemical Thermodynamics
  • Chemical Bonds

These topics will be treated on our YouTube Channel and also download past questions to get more questions on them. You can download it on our website .

Importance of NECO Chemistry Past Questions

NECO Chemistry past questions are important in your studies to help you have an insight into how the exam looks like and how to face questions related to different topics covered in the subject examination to be taken

Excerpts From NECO 2022 Chemistry Past Questions

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NECO Chemistry Questions and Answers 2022 OBJ & Theory Update

– NECO Chemistry Questions and Answers –

In this article, I will be showing you past NECO Mathematics objective and theory random repeated questions and answers for free.   Stay focused and read through.

NECO Chemistry Questions and Answers 2022

The National Examinations Council is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Educ a tion in June/July and December/January respectively.

NECO Chemistry Questions and Answers

Take note of these objective answers below:

CHEMISTRY OBJ : 1-10 DCBBCBBEDC 11-20 CADECEBBDC 21-30 EEBABDADBE 31-40 AECCACDDDC 41-50 DABABCBBCA 51-60 CBBAABCADE 1ai) A mixture contains two or more constituents which can easily be seperated by physical methods 1aii) magnesium trioxonitrate(v) = Mg(NO3)2 molar mass of Mg(NO3)2 =(1*24) + 2 (14*1 + 16*3) =24 + 2 (14 + 48) =24 + 28 + 96 = 148g/mol % of nitrogen = 2*24*100/148 % of nitrogen = 48*100/148 % of nitrogen = 4800/148 % of nitrogen = 32.43% 1aiii) i)calcium oxide (CaO) ii)calcium choride (CaCl2) 1bi) CnH2n+1OH 1bii) hydrolysation 1biii) i)displacement reaction ii)double decomposition reaction iii)decomposition reaction iv)catalytic reaction v)reversible reaction 1biv) i)endothermic heat change ii)exothermic heat change 1ci) i)methyl orange ii)phenolphthalein iii)litmus 1cii) NH4Cl+Ca(OH)2—–>CaCl2+2NH3+2H2O 1ciii) it is collected by upward delivery 1civ) mass of gas = 1.58*22.4 = 35.392 vapour density = 35.392/1 relative molecular mass= V . D * 2 =35.392*2 relative molecular mass= 70.784 ================================== 2ai) i)carbon monoxide and hydrogen ii)carbon monoxide,carbon dioxide, hydrogen and nitrogen 5aii) i)colloids is an intermediate between true solution and a suspension ii)condensation is the process by which water vapour in the air is changed to liquid water 2bi) CaC03+2HCl—–>CaCl2+H2O+CO2 5bii) i)it is used in fire extinguishers ii)it is used in the manufacturing of mineral water iii) carbon(iv)oxide is used as a coolant in nuclear reactors 5biii) i)Cr2O7^-2 =2Cr + C-2*7) = -2 2Cr – 14 = -2 2Cr = -2 + 14 2Cr/2 = 12/2 Cr = 6 ii)Cr2{SO4}3 2Cr + 3 (-2*1 + -2*4) = 0 2Cr + 3 (-2 – 8) = 0 2Cr + 3 (-10) = 0 2Cr – 30 = 0 2Cr/2 = 30/2 Cr = 15 2ci) vulcanization is a chemical process of converting netural rubber or related polymers into more durable materials through the addition of sulphur or other equivalent curatives or accelerators 5cii) Time Taken(t) for 6.35g of copper(ii)tetraoxosulphate solution Cu^2^+ + 2c ——->Cu Q = 2*63.5*95600 Q = 12255500 Q = 1t 12255500/10 = 10*t/10 t = 1225550/60 = 204258.3 5ciii) Latex ================================== 3ai) electrolytic cell is a cell that consist of a container of electrolyte with two electrodes connected to a suitable direct current supply 4aii) i)daniel cell ii)Leclanché cell 4aiii) i)copper ii)tin 4aiv) action of dilute acide on zinc 4av) Zn+2HCl——>ZnCl+H2 3bi) i)dinitrogen(i)oxide(N2O) ii)nitrogen(v)oxide(N2O5) iii)nitrogen(iv)oxide(NO2) 4bii) charle’s law states that the volume of a fixed mass of gas varies directly with the absolute(kelvin)temperature provided the pressure remains constant. 4biii) P1 V1 = P2 V2 given that P1 = 900mmHg P2 = 750mmHg V1 = 300cm^3 V2 = ? V2 = P1V1/P2 V2 = 900*300/750 V2 = 270000/750 V2 = 360cm^3 4biv) % composition carbon = 12/(12*6) + (1*6) *100% = 12/72+6 *100 = 12/78 * 100% = 1200/78% %composition of carbon = 15.38% 3c) TABULATE -THERMOPLASTS- i)it melts when heat is applied to it ii)highly recycled -THERMOSETS- i)does not melt when heat is applied ii)cannot be recycled ================================== 4ai) ionization energy deals with electron loss while electron loss while electron afinity deals with electron gain 2aii) i)they are used to dry gases ii)they are used to recover valuable vapours from industrial effluents and refine petroleum 4bi) TABULATE -RHOMBIC SULPHUR- i)bright yellow in colour ii)it is octohedral in shape -MONOCLINIC SULPHUR- i)amber in colour ii)it is needle like in shape 2bii) oxygen = 60% sodium = 40% oxygen 60/16 3.75/1.74 = 2 sodium 40/23 1.74/1.74 = 1 the emperical formula is NaO2 2biii) sodium(iv)oxide 4ci) i)x is hydrophobic region ii)y is hydrophilic religion 2cii) i)for laundry purpose ii)for fuel 2ciii) i)the distance of outermost electron from the nucleus ii)the size of the positive nuclear charge iii)the screening effect of inner electrons 2civ) period law states that the properties of the elements are a period function of their atomic number 4di) n—pentane—–>n—butane—–>2—methylbutane—2,2—dimethylpropane 2dii) i)glucose ii)galactose ================================== Completed. enjoy.

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NECO Past Questions and Answers For All Subjects PDF

Neco past questions and answers for all subjects are now available for download in pdf format. see how to access neco past questions that will help boost your score and your overall performance in the 2022 neco examination below. neco exam past questions and answers are provided here for download. all you have to do […] the post neco past questions and answers for all subjects pdf appeared first on study forum..

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NECO past questions and answers for all subjects are now available for download in PDF format. See how to access NECO past questions that will help boost your score and your overall performance in the 2022 NECO examination below.

NECO exam past questions and answers are provided here for download. All you have to do is to click on your favorite subjects and the downloading process will begin. Scroll down to download the free NECO past questions and answers below.

NECO Past Questions and Answers 2022

This web page was created for the purpose of helping all prospective undergraduate students who are searching for NECO past questions for both science and art subjects.

If you are one of them, then we wish you good luck as you embark on your journey to write this year’s examination. We have uploaded up-to-date NECO past questions to help you during your preparation.

These past questions will help you to know the nature and pattern of the National Examination Council (NECO). These materials will give you insight and prepares you for what to expect during the examination.

Our earnest desire is that you score higher in the upcoming Senior Secondary Certificate Examination (SSCE) for prospective undergraduates. That’s why we have gone to great lengths to upload the past questions for each subject to ease your preparation.

All you have to do is to set aside time each day for your preparation in order to have a distinction or at least a credit for each subject. Remember, preparation is key to success.

Click on each of the subjects to download the past questions in PDF format. Also, if there is any subject of your choice that we have not included, feel free to inform us using the comment box below this page. Below are NECO past questions PDF for both science and art subjects.

NECO Past Questions and Answers PDF

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  • NECO Literature in English past questions and answers
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NECO Chemistry Questions and Answers 2022/2023 Theory & OBJ Expo

  • March 29, 2022

Getting NECO Chemistry Questions 2021/2022 with solved NECO chemistry answers 2021 before the exam had been a big dream for candidates looking for NECO Chemistry questions and answers in 2021

That is the reason we are sharing this NECO chemistry expo 2021 with candidates so that they will not be stranded during the exam.

Proper usage of this material will guarantee you sure insights on the kind of NECO questions for chemistry 2021 that you should expect and how to draft expo answers for them.

OBJ (Paper 1)NECO Questions and Answers for Chemistry 2021.

The chemistry questions and answers for NECO 2021 will be in two papers. The first paper (paper 1) is the OBJ (objective) and the second paper is paper 2 (theory, essay, calculations and show working).

So in this aspect, I will supply you with the basic NECO chemistry questions 2021 samples with correct NECO chemistry answers 2021 to the NECO 2021 chemistry questions and answers samples.

Check out the sample solved Questions and Answers below.

  • Solved Chemistry Answers
  • Practice Chemistry Questions and answers
  • Secret on how to pass NECO 2021

Sample OBJ Chemistry Questions and Answers for NECO 2021

Solved NECO Chemistry Questions and Answers 2020/2021 for Theory & OBJ. Check free expo runs for chemistry objective and essay papers..

Download NECO 2021 Syllabus for Chemistry

1. Who found the Periodic table?

  • Period Dickson
  • John Dalton

The correct answer is D. Mendeleev

2. Periodic table is arranged in ____and _____

  • Lanthanide and Actinide
  • Groups and periods
  • Groups and electronic configuration
  • Atomic number and outer shell
  • Transition and atomic shell

The correct answer is B. Groups and periods

3. Which of these is not a constituent of Urine.

The answer is E. Bacteria

4. Bronze is made up of _____ and _____?

  • Iron and copper
  • Tin and iron
  • Copper and tin
  • Nickel and iron
  • Zinc and copper

The answer is copper and tin

5. Which of the following is not a metalloids

The correct answer is D. Nickel

6. The most reactive non-metal is_____?

The correct answer is A. Fluorine

7. What is the I.U.P.A.C name of CH 3 CH 2 OH?

The correct answer is D. Ethanol

8. Which of these is not an aromatic compound

  • Acetophenone

The correct answer is E. Tulane

9. The chemical symbol for Silver is____?

The answer is B. Ag

10. An element with an atomic number of 16 will likely belong to group_____ on the periodic table.

The answer is E.6

11. Group 7 elements are also known as _______?

  • Alkali metals
  • Transition elements.
  • Alkali earth metals.

The correct answer is A. Halogens

Get answers for chemistry practical paper

Theory Paper 2, Chemistry Questions and answers 2021 Samples

These are NECO 2021 theory Chemistry Questions and answers 2021 Samples for paper 2. This is the second paper (paper 2) and it is an “essay, calculations and show working section”.

Practice these questions because they might come up in the exam.

1. a. State Faraday’s first law of electrolysis.

Faraday’s first law of electrolysis states that the mass (m) of a substance liberated at an electrode during electrolysis is directly proportional to the quantity of electricity (Q) passing through the electrolyte.

Mathematically;

Where quantity of electricity = current (I) x time (t).

i.e Q = It.

ii. Explain an electrolytic cell.

An electrolytic cell consists of a container of electrolytes with two electrodes connected to a suitable direct current supply.

2a. List 4 constituents of Air.

  • Carbon (iv) oxide
  • Rare gases.

2b. Write the IUPAC name of CH 2 OH CHOHCHO: Ans. 2, 3-Dihydroxy propanal.

3. When 4.5g of liquid water was formed by burning hydrogen gas in oxygen, -72KJ of heat was given off. Calculate the standard heat of the formation of water.

Equation of reaction.

H 2(g) + 1 / 2 O 2(g) → H 2 O(l) ∆H © f = ? KJmol -1 .

4.5g of liquid water produces -72KJ of heat

1.0g of liquid water produces – 72

= -16.0KJ of heat

Therefore, 18g of liquid water will produce: (16.0 x 18) KJ of heat = -288KJmol -1

4. Define the following terms:

  • Bomb calorimeter
  • Heat of fusion
  • Spontaneous reaction
  • Gibbs free energy.

Bomb calorimeter: A bomb calorimeter consists of a strong cylindrical steel vessel lined with enamel to prevent corrosion.

The heat of fusion: This is the heat change when one mole of solid is melted.

Entropy: Entropy is a degree of disorderliness or randomness of a system.

Spontaneous reaction: A spontaneous reaction is a reaction that occurs on its own without the assistance of an external agent.

Gibbs free energy: The free energy (G), of a chemical system is the energy that is available for doing work.

NECO Expo for Chemistry exam 2021 (Important terms)

Now that you have gotten some sample NECO chemistry theory and OBJ questions for 2021 to practice with, let me give you a quick and common expo hint for Chemistry exam 2021 (Important terms to note)

IUPAC: IUPAC means, International Union of Pure and Applied Chemistry.

Nucleus: The Nucleus is made up of Proton and neutron.

Laws of Chemical combination includes;

  • Law of conservation of mass
  • The law of definite proportions or constant composition.
  • Law of multiple proportions.

Chemical symbol: A chemical symbol of an element represents an atom of the element.

Radicals: Radicals are groups of an atom carrying charges that keep their identity and react as a single unit.

Empirical formula: Empirical formula is the simplest possible formula giving the ratio of atoms in a molecule of the compound.

Mole: A mole is the amount of substance that contains as many elementary entities as that in a 12g of carbon.

Isotope: An isotope occurs in elements with the same atomic number (Number of protons) but different mass numbers (because of varying numbers of neutrons).

  • The Avogadro’s Number (N A ) is 6.02×1023

PH scale: the PH scale is numbered from 0 – 14. From 0 to 6 indicates the degree of acidity, 7 is neutral while, above 7 to 14 indicates the degree of alkalinity.

I am sure these NECO Chemistry Questions and answers 2021 material will help you to perform better in this exam.

Please, treat the above questions as sample questions and not as the main exam questions.

neco 2022 chemistry essay questions

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NECO 2022 Chemistry Obj & Essay Questions And Answer Now Available

July 22, 2022 Wakagist Neco 0

neco 2022 chemistry essay questions

2022 NECO CHEMISTRY ANSWERS ==================================================

CHEMISTRY OBJ 01-10: BAAAACAACC 11-20: BCDCAAEDCC 21-30: ABCBDDAACC 31-40: CCACBACCDE 41-50: DDDEDDBDAD 51-60: CBACCEDBBD

COMPLETED ==================================================

(1ai) (i) KAl(SO₄)₂. 12H₂O (ii) Na₂SO₄

(1aii) Number of moles of sodium reacted = reacting mass/molar mass = 3.6/23 = 0.1565moles Number of moles of oxygen reacted = (1/4) x Number of sodium = 1/4 x (3.6/23) = 0.03913 Reacting mass of oxygen = Number of moles x molar mass = 0.03913 x (16×2) = 1.252grams

(1bi) Air in gaseous form is first passed through caustic soda to remove CO₂. It is compressed and cooled until ut becomes a liquid at -200°C. It is then led to a fractionating column. On distillation, Nitrogen which has a lowest boiling point of -196°C is evolved first leaving behind Oxygen in liquid form. Further heating converts the liquid to a gas at -183°C.

(1bii) (i) It is used for combustion (ii) It is used for artificial respiration

(1biii) This is because room temperature is warmer

(1biv) (i) Methyl orange (ii) Phenolphthalein

(1ci) An ion is an atom or molecule which has a net electric charge due to the loss or gain of one or more electrons.

(1cii) HCl gas doesn’t contain ions

(1cii) (i) Noble gases: Neon, Helium (ii) Halogens: Iodine, Fluorine (iii) Alkaline earth metals: Calcium, Magnesium

(1civ) Halogens attain stable octet configuration by accepting an electron from donors Group I elements.

(1di) A sol is a colloid where solid particles are dispersed in liquid medium.

(1dii) Jelly

(1diii) (i) Acid-base titrations are used to determine the percentage purity of a substance (ii) Acid-base titrations are important to determine the number of water molecules in a hydrate. ==================================================

(2ai) A molar solution of a compound contains one mole or the molar mass of the compound in one dm³ of the solution.

(2aii) (i) Identification of gases (ii) Identification of acidic and metallic radicals

(2aiii) (i) Purification of bauxite (ii) Electrolysis of alumina

(2bi) [img]https://i.ibb.co/vPBwDjB/IMG-20220725-WA0082.jpg[/img]

(2bii) This is because of the presence of copper which is a transition metal

(2bii) (i) Methanamide is a liquid while the rest amides are crystalline solids (ii) Melting points and boiling points of aides are much higher than expected.

(2ci) (i) Heavy chemicals are produced in very large quantities in industries While fine chemicals are produced in small quantities for specific purposes (ii) Heavy chemicals are in a crude state While fine chemicals are purified.

(2cii) (i) Million’s reagent (ii) Feeling’s solution

(2ciii) Graham’s law of diffusion states that at a constant temperature and pressure the rate of diffusion of a gas is inversely proportional to the square root of its density.

(2civ) RO₂/RCH₄ = √(MCH₄/MO₂) 5/(200/t) = √[(12+4)/(16×2)] 5t/200 = √16/32 t/40 = 1/√2 t = 40/√2 t = (40/√2) × (√2/√2) t = 20√2 seconds Time taken = 28.28 seconds.

(4ai) A hydrocarbon is an organic compound composed only of two elements carbon and hydrogen.

(4aii) (i) Alkenes (ii) Alkynes

(4aiii) They are unsaturated compounds

(4aiv) (i) Decrease in pressure (ii) Finely divided zinc (iii) Removal of hydrogen gas

(4bi) (i) Electrovalent compounds conduct electricity While covalent compounds do not. (ii) Electrovalent compounds dissolve in polar solvents While covalent compounds dissolve in non-polar solvents.

(4bii) (i) High melting and boiling points (ii) Exist mainly as solids at room temperature

(4biii) (i) Ammonia, NH₃ (ii) Hydrogen chloride gas, HCl

(4ci) (i) Potassium hexacyanoferrate(II) (ii) It is a complex salt

(4cii) (i) Wrought iron (ii) Cast iron

(4ciii) 2H₂ + O₂ →2H₂O 2 : 1 : 2 Reacting volumes; 40cm³ : 20cm³ : 40cm³ Residual volumes; (50 – 40) (20 – 20) = 10cm³ = 0cm³ = 40cm³ Total residual volume = 10 + 40 = 50cm³ ===========================================

(5ai) (i)Chlorofluorocarbons (ii) Hydrofluorocarbon

(5aii) I – C₂H₂OH + H₂SO₄ —>C₂H₅HSO₄ + H₂O II – C₂H₅HSO₄ —> C₂H₄ +H₂SO₄

(5aiii) (i) They incompletely filled d-orbitals (ii) They exhibit variable oxidation state

(5bi) (i) It is used in making aeroplane parts due to its tensile strength (ii) It is used in making window frames because it cannot be easily oxidised

(5bii) A white precipitate is formed with evolution of brown gas

(5biii) (i) Hydrogen bond (ii) Covalent bond

(5ci) (i) Oxidation (ii) Electrolysis

(5cii) (i)Temperature (ii)Concentration

(5ciii) H₂SO₄ + 2NaOH —> Na₂SO₄ +2H₂O CaVa/CbVb = Na/NB Va = CbVbna/Can Va = 0.1×25×1/0.5×2 Va = 2.5cm³ ==============================

(6ai) Rate of a chemical reaction is defined as the number of moles of reactant converted or product formed per unit time.

(6aii) Mass of CaCO3 = 3g Molar mass of CaCO3= 100g/mol No. of moles = 3/100 = 0.03 Time = 2×60 = 120s Rate of reaction = No. of moles/Time = 0.03/120 = 2.5 × 10-⁴

(6aiii) (i) They are more resistant to corrosion (ii) They are more durable (iii) They have lower melting point

(6aiv) 2Pb(NO₃)₂ —> 2PbO + 4NO₂ +O₂

(6bi) I =Hard water= (i)It has better taste than soft water (ii) It can be supplied in lead pipes as it does not dissolve lead

II =Soft water= (i) It does not deposit scale in boilers and fur in kettles (ii) It does not waste soap

(6bii) I – CO II – SO₂

(6biii) I – Hardness II – Lustre appearance III – Conductivity IV – Ability to absorb

(6c) 4.3/2.12 = 142+18x/142 2.12(142+18x)/2.12 = 4.3*142/2.12 142+18x = 288 18x = 288-142 x = 146/18 x = 8

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

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    1. Who found the Periodic table? Period Dickson John Dalton Faraday Mendeleev The correct answer is D. Mendeleev Advertisements 2. Periodic table is arranged in ____and _____ Lanthanide and Actinide Groups and periods Groups and electronic configuration Atomic number and outer shell Transition and atomic shell

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