Waec 2022 Chemistry Question 3

Practice essay / theory question 3 from the 2022 Waec Chemistry examination. This question covers General .

Waec 2022 Chemistry Essay / Theory

Topic: General

Question 3 WAEC • 2022 • CHEMISTRY • essay

Question Parts

( a(i) )

Define the term Avogadro's number.

( a(ii) )

If \( 2.30 g \) of an oxide of nitrogen, \( x \), contains \( 3.01 \times 10^{22} \) molecules, calculate the molar mass of \( x \).

( a(iii) )

Deduce the formula of \( x \). \[ \left[\mathrm{N}_{ ext{A}}=6.02 \times 10^{23}, \mathrm{~N}=14.0, \mathrm{O}=16.0\right] \]

( b(i) )

Describe briefly what happens when each of the following substances are added to water: (I) \( \mathrm{CCl}_{4} \); (II) \( \mathrm{SiCl}_{4} \)

( b(ii) )

Explain briefly why the reactions in 3b(i) and 3b(i) (II) are different.

( c(i) )

Study the diagram below and answer the questions that follow. (i) What is the set-up used for?

( c(ii) )

Mention two compounds that could be used as electrolytes in the cell.

( c(iii) )

Write a half-cell equation for the reaction at the anode.

( c(iv) )

Calculate the electrochemical equivalent of copper if the cathode gained mass of 3.2 g when 50 amperes of current was passed for 3 minutes 13 seconds.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Waec 2022 Chemistry Question 3. It is one of the essay questions from the 2022 Waec Chemistry examination.

The question covers General .

View More Waec 2022 Chemistry Questions More Waec Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support