WAEC Chemistry Questions and answers 2022

Are you a WAEC candidate seeking for answers on WAEC 2022? Have you been searching for the following questions: Waec chemistry answers 2022, Waec chemistry questions and answers 2022, then this post is for you. Keep reading to know more.

Read Also: WAEC Geography Questions and Answers 2022

In this article, we’ll be looking into WAEC Chemistry questions and Answers for 2022. It include the 2022 WAEC Chemistry questions and Answers, Past questions and answers and all you need to know about the WAEC Chemistry Examination questions. Few hints is also included on how to pass WAEC Chemistry Examination.

 

READ ALSO: WAEC Mathematics Questions and Answers 2022 ( Mathematics Obj and Essay Answers)

This post will be updated as more information come in. So we advise you book mark this page or drop your email in the comment box so as to be updated via your mail about the update.

To start with, let’s look into the details about how the 2022 WAEC questions will look like as well as important things you need to know about it. WAEC Chemistry past questions and Answers are also included.

All you need to know about the 2022 WAEC Chemistry Exam

The WAEC 2022 Chemistry examination is in two parts – Objective and Essay.

You should be expecting 50 questions from the objective part and all to be answered within one hour.

The Essay part contains between 5 to 7 in part A and about 7 in part B. You are to answer all in part A while you answer any four in part B. All to be answered in two hours and thirty minutes.

Note that all question carries equal mark.

 

WAEC Chemistry Past Question and Answers

Below is a WAEC Chemistry answers 2021 sample to take note of.

1. What condition favours the formation of the product for the endothermic reaction, N2O4(g) —><—– 2NO2(g)

A. Decrease in pressure

B. A decrease in volume

C. An increase in pressure

D. A constant volume

ANSWER: A ( Decrease in pressure)

2. How many alkoxy alkanes can be obtained from the molecular formula C4 H4O4

A. 1

B. 2

C. 3

D. 4

ANSWER: C (3)

3. Element Y has two isotopes Y and Y present in the ratio 1:3. The relative atomic mass of Y would be

A. 20.5

B. 21

C. 21.5

D. 22

ANSWER: C (21.5)

4. 100.0g of KClO3 was added to 40.0 cm^3 of water to give a saturated solution at 298K. If the solubility of the salt is 20.0 moldm^-3 at 298K, what percentage of the salt is left undissolved? {K= 39, Cl = 35.5, O = 16}

A. 80%

B. 60%

C. 5%

D. 2%

5. Elements X and Y have electronic configuration 1S22S22P4 and 1S22S22P63S23P1 respectively. When they combine the formula of the compound formed is

A. XY

B. Y2X3

C. Y2 X3

D. Y X2

ANSWER: B (Y2X3)

6. A solution of 0.20 mole of NaBr and 0.20 mole of MgBr2 in 2.0 dm3 of water is to be analysed. How many moles of Pb(NO3 )2 must be added to precipitate all the bromide as insoluble PbBr2

A. 0.30 mol

B. 0.10 mol

C. 0.20 mol

D. 0.40 mol

ANSWER: A (0.30 mol)

7. Na2CO3 + HCl —-> NaHCO3 + NaCl. The indicator most suitable for this reaction should have pH equal to.

A. 3

B. 5

C. 7

D. 9

ANSWER: D (9)

8. A satuarted solution of silver trioxocarbonate (IV), was found to have concentration of 1.30 x 10-5 moldm-3 . The solubility product of the trioxocarbonate (IV) is

A. 8.79 x 10-15

B. 1.69 x 10-10

C. 1.82 x 10-11

D. 9.84 x 10-10

ANSWER: A (8.79 x 10-15)

9. When platinum electodes are used during the electrolysis of copper (II) tetraoxosulphate (IV) solution, the solution gets progressive

A. Acidic

B. Basic

C. Neutral

D. Atmospheric

ANSWER: A (Acidic)

10. Tetraoxosulphate (VI) ions are final test using

A. acidified silver nitrate

B. acidic barium chloride

C. lime water

D. dilute hydrochloric acid

ANSWER: D (dilute hydrochloric acid)

 

WAEC 2020 Chemistry Theory Questions

PAPER 2 (ESSAY)

SECTION A

1. Identify the solid remaining when each of the following is heated.

(a) lithium trioxonitrate (V)

(b) potassium trioxonitrate (V)

(c) calcium trioxonitrate (V)

2. (a) When calcium oxide and coke are heated in an electric furnace, the products are carbon (ii) oxide and calcium carbide (CaC2), write the equation for this reaction.

(b) The addition of water to calcium carbide leads to the formation of calcium hydroxide and ethyne. Write the equation for the production of ethyne.

3. Calculate the percentage by mass of silicon tetrachloride. [2 marks]

4. Ammonia, NH3, and phosphine, Ph3, are the hydrides of the first two elements in group 5.

(a) Draw a dot and cross diagram for the ammonia molecule. [2 marks]

(b) Sketch and explain the shape of the ammonia molecule. [3 marks]

5. The first ionization energy of chlorine is +1260KJmol-1.

(a) Define the term first ionization energy.

(b) State and explain the general trend in the values of the first ionization energy for the elements across the period, sodium to argon in the periodic table.

6. Compound A consisting of carbon and hydrogen only. The compound was found to contain 80% carbon by mass.

(a) Calculate the empirical formula of compound A using the data above.

(b) The relative molecular mass of compound A was found to be 30.

Use this information to deduce the molecular formula of compound A.

[H = 1.00 C = 12.00]

7. State two factors other than a change in temperature or the use of a catalyst that influence the rate of a chemical reaction.

 

Today’s WAEC Chemistry Answers

The 2022 WAEC Chemistry questions are loading. Like we have said it earlier in this article. You can bookmark this page or drop your email to get the update on it comes.

You can be sure that the WAEC Chemistry Answers will be posted here once the exam starts. This is why you have to keep visiting this page so as not to miss out.

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How to pass WAEC Chemistry Examination

Here are some common rules that you should apply when taking this exam.

Start by answering questions you are sure of the Answers first.

Do not spend more than a minute on each Objective questions. Remember you only have one hour

Endeavor to recheck your work before submitting it.

Make sure you attempt all the questions. Ensure to put something down; it is better than a blank page.

See Also: Waec Questions and Answers 2022/2023 (Free Waec Answers for all Subjects)

 

WAEC Chemistry Syllabus 2022

The resources below on Chemistry have been provided by WAEC to assist you to understand the required standards expected in Chemistry final Examination.

The examination in this subject is meant to test:

Note: Candidates are required to have knowledge of the significant figures, S.I. units, and the conventional/IUPAC system of nomenclature

AIMS: The aims and objectives of the syllabus are to assess candidates’

  • understanding of basic chemistry concepts;
  • level of acquisition of laboratory skills including awareness of hazards and safety measures;
  • level of awareness of the inter-relationship between chemistry and other disciplines;
  • level of awareness of the linkage between chemistry and industry/environment/everyday life in terms of benefits and hazards;
  • skills of critical and logical thinking.

Note: Candidates are required to have knowledge of the significant figures, S.I. units, and the conventional/IUPAC system of nomenclature.

You can see the complete WAEC Syllabus via this link CHEMISTRY-converted

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