2024 WAEC CHEMISTRY: (9820)

Chemistry Objective

1ABACCABBCD

11DCDBCCDCDB

21BDCADAABCA

31CBDCCDCBBD

41CACCCDADCA

Completed: 

_______________________________

PAY FOR YOUR WAEC ENGLISH EXAM NOW

PRICE: N1000 MTN-CARD

_________________________________

(4)

___________________________________

(2ai)

Ionization energy can be defined as the energy required to remove a loosely bound electron from the outermost shell of a gaseous covalently bonded atom.

(2aii)

This is because B has more shells than Be which makes the valence electrons to be far from the nucleus making it require less energy due to lesser nuclear attraction.

(2b)

I = 0.12A, t = 500seconds

m = 0.015g, F =96500C

M = 48.0, Charge = ?

Using;

m = MIt/CF

C = MIt/mF

C = (48x0.12x500)/(0.015x96500)

C = 2

(2ci)

Al₂O₃

(2cii)

(i) Electricity supply

(ii) Nearness to source of material

(2di)

This can be defined as a property of metal which are weakly attracted to an applied magnetic field

(2dii)

(i) I → ₂₄Cr²⁺ → 2

₂₄Cr⁶⁺ → 0

(ii) ₂₄Cr²⁺

(iii) It has unpaired electrons.

__________________________________

(3)

(3ai) 

This can be defined as the number of atoms or molecules in one mole of a substance which is equal to 6.02 ×10²³

(3aii) 

Mass/m.m = no. of molecules/Avogadro's number

(2.30/m.m) × (3.01×10²²/6.02×10²³)

m.m = (2.30×6.02×10²³)/3.01×10²²

m.m = 46g/mol

(3aiii) 

Since the molar mass = 46g/mol 

The formula is NO₂

:. 14+(16×2)

14+32 = 46g/mol

:. NO₂

(3bi)

(i) There is no reaction but rather forms a layer underneath the water 

(ii) It reacts violently with water forming white silicon dioxide and hydrogen chloride gas.

(3bii)

The reaction is different because CCl₄ is an organic substance while SiCl₄ is not.

(3ci)

Extraction of copper

(3cii) 

(i) CuSO₄

(ii) CuCl₂

(3ciii)

Cu²⁺ + 2e⁻   ---> Cu

(3civ)

Using; m = ZIt

Z = m/It

Z = 3.2/(50x(3x60)+13)

Z = 3.2/(50x193)

Z = 3.2/9650

Z = 0.000332g/Asec

(3d)

Oxygen can be prepared by heating KClO₃ in the presence of manganese(iv)oxide which acts as a catalyst to produce KCl and oxygen gas. The reaction takes place at a lower temperature and much faster rate.

KClO₃ (MnO₂)heat-----> KCl + O₂

__________________________________

(1)

(1ai)

According to Lewis, an acid can be defined as a substance that can accept a pair of non-bonding electrons i.e an electron pair acceptor.

(1aii)

AlCl₃

(1b)

Salting out is a process through which soap is precipitated as solid from the suspension by adding common salt to the suspension. It is a purification process.

(1c)

Reagent - Silver trioxonitrate(v)

Condition - The reaction takes place at high temperatures and pressure.

(1d)

This is the proportion at which isotopes of an element are to each other in its composition.

(1e)

(i) It has a stable configuration

(ii) This is because they have a covalent bond.

(1f)

They can be differentiated using barium chloride. When barium chloride is added to concentrated H₂SO₄ a white precipitate is formed with concentrated HNO₃

(1g)

[TABULATE]

-ELECTROCHEMICAL CELL-

(i) There are two electrolytes

(ii) Salt bridge is present.

-ELECTROLYTIC CELL-

(i) There is only one electrolyte

(ii) There is no salt bridge present.

(1h)

The lower the ionisation energy, the higher the reactivity of metals. Since it decreases down the group, the reactivity increases down the group I.

(1i)

This can be defined as a formula that shows the actual number of atoms in a compound.

(1j)

(i) NH₃

(ii) This is because its interaction is perfectly inelastic.

_______________________________

(5)

(5a)

(i) It melts to clear mobile liquid

(ii) A brownish gas is evolved.

(5bi)

(i) Carbon(ii)oxide

(ii) Lead(ii)oxide

(5bii)

Methane(CH₄)

(5biii)

(i) It leads to erosion

(ii) It causes pollution

(5biv)

This is because it has more surface area than it occupies leading to a faster rate of reaction.

(5bv)

Ammoniacal liquor

(5ci)

When water is added to white anhydrous CuSO₄ it turns blue.

(5cii)

(i) It removes the hardness by precipitating the trioxocarbonate(iv)

(ii) It removes the hardness by removing the calcium or magnesium ion and precipitating trioxocarbonate(iv).

(5ciii)

Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂

________________________________

QUESTIONS:

Welcome to official 2024 Chemistry WAEC answer page. We provide 2024 Chemistry WAEC Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct WAEC Chems Expo. WAEC Chemistry Questions and Answers 2024. WAEC Chems Expo for Theory & Objective (OBJ) PDF: verified & correct expo Solved Solutions, . 2024 WAEC EXAM Chemistry Questions and Answers

Questions Students ask about 2024 WAEC CHEMISTRY: (9820)

• How to get 2024 Chemistry WAEC QUESTION AND ANSWERS before the exam? To get midnight before the exam, all you need to do is to visit Gistpower.com with the pin sent to you by the admin and login. With the pin, you can have a full access to

---

• When do I get Verified 2024 Chemistry WAEC QUESTION AND ANSWERS? You will get a night to the exam because Chemistry is an important subject.

---

• After using 2024 Chemistry WAEC ANSWERS, How many am I assured of in Chemistry? You will score between 7As - 9As in Chemistry if you write verbatim .

---

• How verified is your 2024 Chemistry WAEC ANSWERS? Our is 100% verified and legit and it is worthy to be trusted because it from Gistpower.com which is the most trusted website for exam runs in Nigeria.

---

• Where do I get 2024 Chemistry WAEC QUESTION AND ANSWERS? You can get only from Gistpower.com

---

• Is the answers on this page actually the main ? No, This is 2022 WAEC CHEMISTRY OBJ QUESTIONS AND ANSWERS, to get , you need to subscribe with us by texting or WhatsApping us.

---

• How do I subscribe for 2024 Chemistry WAEC Questions & ANSWERS? To subscribe for 2024 Chemistry WAEC Questions & ANSWERS, Message 09069477478 stating that you need 2024 Chemistry WAEC Questions & ANSWERS a day to the exam.

Welcome to official 2024 Chemistry WAEC answer page. We provide 2024 Chemistry WAEC Questions and Answers on Essay, Theory, OBJ midnight before the exam, this is verified & correct WAEC Chems Expo

Name: Gistpower.com

Founded: 2010 (14 years)

Founder: Mr. Dave

Headquarters: Borno, Nigeria

Official Website: https://gistpower.com/

Official Contact: +234