CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Chemistry Theory And Objective: Questions  & Answers For 2022/2023 WAEC Exam. Are you a student who wants to make a good grade in Chemistry? Here are the WAEC Chemistry questions and everything you need to know about 2021 WAEC Chemistry. This post provides provided for you with all you need to know in Chemistry Paper 1 (Objective) and Chemistry 2 (Essay).

Welcome to the Chemistry Theory and Objective: Questions & Answers for the 2022/2023 WAEC Exam. This comprehensive guide has been designed to assist students in their preparation for the upcoming WAEC Chemistry examination. It presents a collection of theory and objective questions along with their corresponding answers, covering the essential topics and concepts outlined in the WAEC syllabus. By studying and practicing these questions, you will gain a solid foundation in chemistry and improve your chances of achieving excellent results in the exam. So let’s delve into the world of chemistry and embark on a journey of learning and success.

The Question & Answers: CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

Furthermore, below are the WAEC Chemistry questions. Read them properly. In fact, they will make you ready to score high in your WAEC Chemistry exam.

The West Africa Examination Council (WAEC) is an examination body in Nigeria. It has the statutory power to conduct the Senior Secondary Certificate Examination in May/June and the General Certificate in Education in November/December.

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CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

General tips and advice to help you prepare for your exams effectively.

1. Study the syllabus: Familiarize yourself with the syllabus for your respective exams. Understand the topics and concepts that are likely to be covered and focus your preparation accordingly.
2. Review past papers: Practice solving past exam papers to get an idea of the types of questions that may be asked. This will help you become familiar with the exam format and identify any areas where you need further improvement.
3. Understand the concepts: Chemistry involves understanding fundamental concepts and principles. Ensure you have a strong foundation by studying the theory thoroughly. Take notes, create summaries, and use diagrams or visual aids to help you grasp complex concepts.
4. Practice problem-solving: Chemistry often requires application and problem-solving skills. Practice solving numerical problems and chemical equations regularly to strengthen your problem-solving abilities. This will also help you become more familiar with the calculations and techniques needed for the exam.
5. Seek clarification: If you come across any challenging topics or concepts, don’t hesitate to seek clarification from your teachers, classmates, or online resources. Understanding the material thoroughly will boost your confidence during the exam. CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM..
6. Create a study schedule: Plan your study sessions and allocate sufficient time to each topic based on its importance and your level of understanding. Break down your study material into manageable chunks and set realistic goals to stay motivated.
7. Collaborate with peers: Consider forming study groups with classmates or friends who are also preparing for the exams. Discussing and explaining concepts to each other can enhance your understanding and retention of the material.
8. Utilize available resources: Take advantage of textbooks, reference materials, online resources, and educational platforms that provide study materials, practice questions, and tutorials specific to your exam. These resources can provide valuable insights and additional practice opportunities. CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.
9. Practice time management: During the exam, time management is crucial. Practice solving questions within the allocated time limits to improve your speed and accuracy. This will ensure that you can complete the exam within the given time frame.
10. Stay focused and maintain a healthy lifestyle: Avoid distractions and create a conducive study environment. Take regular breaks, exercise, eat nutritious meals, and get enough sleep to keep your mind and body in optimal condition for studying.

Remember, success in any exam is a result of consistent effort, effective preparation, and a positive mindset. Good luck with your exams!

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

WAEC Chemistry Questions and Answers 2022:

Furthermore, the questions below are the WAEC Chemistry Questions. Going through them will make you ready to score high in your WAEC 2021 Chemistry Examination. Congratulations.

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

A. 1

B. 2

C. 3

D. 4

ANSWER: C (3)

2. 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)

3. What condition favors 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)

4. Elements X and Y have electronic configurations 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)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM

5. A solution of 0.20 mole of NaBr and 0.20 mole of MgBr2 in 2.0 dm3 of water is to be analyzed. 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)

6. 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)

7. A saturated solution of silver trioxocarbonate (IV), was found to have a 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)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

QUESTIONS & ANSWERS FOR THE 2022/2023 WAEC EXAM

8. 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%

9. Tetraoxosulphate (VI) ions are the final test using

A. acidified silver nitrate

B. acidic barium chloride

C. lime water

D. dilute hydrochloric acid

ANSWER: D (dilute hydrochloric acid)

10. When platinum electrodes 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)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM

WAEC 2022/2023 Chemistry Theory Questions

PAPER 2 (ESSAY)
SECTION A

1. (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.

2. Calculate the percentage by mass of silicon tetrachloride. [2 marks]
3. 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]
4. 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.
5. Compound A consists 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]
6. State two factors other than a change in temperature or the use of a catalyst that influence the rate of a chemical reaction.
7. Identify the solid remaining when each of the following is heated.
   (a) lithium trioxonitrate (V)
   (b) potassium trioxonitrate (V)
   (c) calcium trioxonitrate (V)

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For the 2022/2023 WAEC EXAM

SECTION B

1. An aqueous solution has a pH of 4.0.
   (a) (i) What is the hydrogen ion concentration of the solution?
   (ii) What effect will it have on litmus paper?
   (iii) Which of the following salt solutions would have the same effect on litmus? Give a reason for your answer. NH4Cl(aq); NaCl(aq) ; CH3OON(aq).
   (b) (i) Differentiate between a fine chemical and a heavy chemical.
   (ii) Name two sources of air pollution.
   (iii) Suggest one way of reducing air pollution in cities
2. (a) (i) Explain briefly the fermentation process.
   (ii) Write a balanced equation for the fermentation of glucose.
   (iii) What substance must be added to glucose solution to ferment it?
   (iv) Explain briefly why tightly corked glass filled to the brim with palm wine shatters on standing.
   (b) State one industrial application of each of the following methods of separation:
   (i) Crystallization;
   (ii) Fractional distillation.
   (c) Explain the following terms:
   (i) Saponification;
   (ii) Esterification.
   (d) Write a balanced equation to illustrate each of the terms in (c).
   (e) i) What is hydrocarbon compound?
   (ii) Name two principal sources of hydrocarbons.

CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

QUESTIONS & ANSWERS FOR 2022/2023 WAEC EXAM

1. (a) Two elements represented by the letters Q and R have atomic numbers 9 and 12 respectively.
   (i) Write the electron configuration of R.
   (ii) To what group does Q belong in the periodic table?
   (iii) Write the formula of the compound formed when Q combines with R.
   (iv) Explain briefly, why Q is a good oxidizing agent.
   (v) State whether R would be expected to form acidic or basic oxide.
   (b) (i) State two assumptions of the kinetic theory of gases.
   (ii) When some solids are heated, they change directly into the gaseous state. What name is given to this phenomenon?
   (iii) List two substances that exhibit the phenomenon mentioned in (ii).
   (iv) Write an expression to show the mathematical relationship between the rate of diffusion of a gas and its vapor.

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In conclusion, mastering the Chemistry theory and objectives is crucial for success in the upcoming 2022/2023 WAEC exam. By diligently studying and understanding the key concepts, practicing with a wide range of questions, and seeking clarification when needed, students can enhance their understanding of this fascinating subject. Remember, a strong foundation in Chemistry will not only boost your performance in the exam but also equip you with valuable knowledge for future academic pursuits. Stay focused, stay determined, and embark on this journey with confidence. Best of luck in your preparations and may you excel in the upcoming WAEC exam! CHEMISTRY THEORY And OBJECTIVE: QUESTIONS & ANSWERS For 2022/2023 WAEC EXAM.

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