WAEC Chemistry Questions and Answers 2022/2023 OBJECTIVE & ESSAY/THEORY

WAEC Chemistry marking schemes is likely to change, which is one of the main reasons why you need the live WAEC Chemistry Questions and Answers 2022 to prepare for your examinations. Despite the fact that we recommend that you use the WAEC Chemistry past questions 2021, we think that the Biology waec question 2021 will be very different from what you have seen in previous years. And no one has any way of knowing what will happen. On this website, we will supply you with the original live WAEC Chemistry Questions and Answers, so you will not have to worry.

You might be one of the 2022 WAEC aspirants who is looking forward to get the appropriate WAEC Chemistry Questions and Answers 2022 expo runs solutions so that you can pass the 2022 WAEC Chemistry exams and come out with flying colors. If this is all what you have been waiting for, you have arrived here on time.

Don’t forget, the most recent information and make use of the WAEC Chemistry Questions and Answers exam solutions for 2022 that will be provided to you on this website.

WAEC Chemistry OBJ Answers Sample Questions 2021 – WAEC Chemistry Questions and Answers (Expo) 2022

1. Which of the statements below is correct about Isotopes of the same element?

  1. Have the Same number of Protons, neutrons, and electrons.
  2. Same Protons and neutrons but a different number of electrons.
  3. Same number Protons and electrons but a different number of neutrons.
  4. The number of Neutrons and electrons is the same but the number of protons differs.

2. The chemical bond that is formed by the transfer of electrons is known as?

  1. Covalent Bond
  2. Dative Bond
  3. Ionic bond
  4. Metallic bond

3. Two electrons can fill the same orbital if only?

  1. They have different Angular momentum quantum numbers.
  2. Magnetic quantum numbers differ
  3. Principal quantum numbers are different.
  4. Spin quantum numbers not the same

4. Which of the substances listed below is not a hydrocarbon?

  1. Benzene
  2. Butane
  3. Ethyne
  4. Ethanamide

5. The complete ionization of A substance into hydroxonium ions indicates:

  1. Strong acid.
  2. Strong base.
  3. Weak acid.
  4. Weak base.

6. One of the solutions below that can resist changes in pH when a small quantity of a base or acid is added is?

  1. Buffer solution
  2. Neutral solution
  3. Saturated solution
  4. Supersaturated solution

7. Write a balanced chemical equation for a 2.47g dry pure copper (II) oxide which is completely reduced copper using a laboratory gas. If the mass of the residue left is found to be 1.97g.

    1. Cu + O → CuO.
    2. 2Cu+O2 → 2CuO
    3. Cu → O
    4. 2Cu →O2

The correct answer is B. 2Cu+O2 → 2CuO.
See how this question is solved in the number one (No.1) question in the theory section.

Use this question to answer question 2 & 3

8. Calculate the mass of anhydrous sodium-trioxocarbonate (IV) present in a 300cm3 of 0.1M; (Na =23, C=12, O=16).

  1. 18g
  2. 18kg
  3. 16g
  4. 56g
  5. 16kg

The correct answer is A. 3.18g. See solving in No.2 ques. in the theory section.

9. The number of Na2CO3 particles present in the solution

  1. 6.02 X 1023
  2. 0.1 X 6.02 1023
  3. 1.81 X 1022
  4. 1.81 X 1023
  5. 6.02 X 1022

The correct answer is C. 1.81 X 1022.

WAEC Chemistry Theory Questions and Answers Sample Questions 2022

2.47g of dry pure copper (II) oxide was completely reduced to a copper using laboratory gas. The mass of the residue left was found to be 1.97g. Write a chemical equation for this reaction.

Solution.

Molar mass of copper atoms =63.5

No. of moles of copper atoms =1.97

=63.5 = 0.03 mole

=16

READ MORE  WAEC CRS/CRK Questions and Answers 2022/2023

Molar mass of oxygen atoms = 16

No. of moles Oxygen atom = (2.47 – 1.97) = 0.5

=0.03 mole

Mole ratio of Cu to O = 0.03  :   0.03

=    1   :    1

Therefore, the equation is Cu + O → CuO.

But Oxygen is diatomic, so we have 2Cu+O2 → 2CuO

2. Calculate the;

  • mass of anhydrous sodiumtrioxocarbonate (IV) present in a 300cm3 of 0.1M;
  • Number of Na2CO3 particles present in the solution (Na =23, C=12, O=16)

Solutions

a. Molar concentration of Na2CO3 =0.1M

Molar mass of Na2CO= 106gmol-1

Mass concentration = Molar concentration X Molar mass

=0.1 X 106

=10.6gdm-3

i.e 1000cm3 of 0.1M solution contain 10.6g of Na2CO3

Therfore,300cm3 of 0.1M solution will contain

= 300 X 10.6/1000

=3.18g of Na2CO3

b. Number of Na2CO3 particles

=Molar concentration X 6.02 X 1023

=0.1 X 6.02 1023

=6.02 X 1022

Now, 100cm3 of 0.1M solution contains 6.02X1022 Na2COparticles

Therefore, 300cm3 of 0.1M solution will contain 300X6.02 X1022/1000

= 1.81 X 1022 particular of Na2CO3.

How to Get WAEC Chemistry Questions and Answers 2022/2023 for FREE

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How to Pass WAEC Chemistry Exams 2022 | WAEC Chemistry Expo 2022

1.     Put Reading First.

People who claim that they must stop reading because they have completed their education are completely wrong. It’s a completely erroneous belief or perception to think that once you have completed your education it’s all over. Learning never stops you know; anyone who stops reading or learning will be living with old information and will move around with it. We live in a world that is constantly changing, and in order to be a very successful human being in today’s society, you must keep up with the latest information.

In reality, relying on a single author for ideas or information is not a proper way of getting updated information. To amass enough information, read as many books as possible.

We implore all applicants who are about to take the WAEC Chemistry exams 2022 to continue reading books relating to their field of interest on a regular basis.

2.     Obtain the Appropriate Preparatory Materials

Exam preparation should not be limited to reading books. The question you should ask yourself is, “What kind of book am I reading, and how will it help me pass the WAEC Chemistry exams?” Here is what you should consider as appropriate prepared material: textbooks, dictionaries, waec Past Questions and Answers and so on.

3.     Attend Extra-Classes.

Attending extra moral classes can be a source of pride for some people. Some people believe they are too big and are unconcerned about it. This is a completely incorrect viewpoint, and you must change it. Extra classes will help you grow, extend, and broaden your intellectual capacity, making it easier for you to understand things.

Extra moral classes, organized by educational tutors, can be observed all over. This type of class can be held after school in the evenings, during the holidays, or after the school day has ended for the term or session.

You will never be sorry if you attend one.

4.     Set Out Time for Rest

Many people who are studying for impending examinations are unaware of the importance of rest and sleep. It’s a once-in-a-lifetime opportunity. When you take time to rest or sleep, your brain relaxes and your mind calms. Everything is new and your strength has been renewed by the time you wake up. If you force yourself to read when you are sleepy or exhausted, you will not be able to perform better; you will fall asleep quickly, and by the time you wake up, everything you read will have vanished.

This is something that all UTME candidates should be aware of because it is really significant.

5.     Maintain a Healthy Way of Life

One of the things that will motivate you as a person is to eat properly and live a healthy lifestyle. You can easily get sick if you don’t eat well and healthily, such as consuming meals that aren’t truly clean, low-quality foods, and you don’t build up your cells to be immune to sickness.

During the process of studying for tests, many students or candidates become weary, dizzy, and even sick. To avoid this, as soon as you notice a symptom of disease, make an appointment with a doctor, your parents, or the people you live with for additional medical attention.

6.     Chatting on social media should be limited.

It is not a proper thing to spend 80% of your time on social media sites such as Facebook, Twitter, Instagram, and others, and just 20% of your time on your academics. You’ll never be able to create it that way. At the very least, make it 80/20. 80 percent of your time should be spent studying and researching in preparation for your upcoming waec exams.

You may always go back to those things after you have finished your waec exams. FOCUS is the key word here.

This is the extent of our discussion at this time. We will provide more information as soon as we lay our hands on it. If you found this post useful, please share it with others.

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