Question 1
On the carbon-12 scale, the relative atomic mass of an element is defined as:
Correct Answer:
The weighted mean mass of an atom of the element compared with 1/12 of the mass of a carbon-12 atom
Question 2
The Avogadro constant L is approximately 6.02 × 10²³ mol⁻¹. How many molecules are in 0.250 mol of CO₂?
Correct Answer:
1.505 × 10²³
Question 3
An element has isotopes with mass numbers 63 (69.2% abundance) and 65 (30.8% abundance). What is its relative atomic mass to three significant figures?
Correct Answer:
63.6
Question 4
A compound contains 40.0% C, 6.7% H and 53.3% O by mass. What is its empirical formula? (Ar: C = 12.0, H = 1.0, O = 16.0)
Correct Answer:
CH₂O
Question 5
A hydrocarbon has empirical formula CH₂ and relative molecular mass 56. What is its molecular formula?
Correct Answer:
C₄H₈
Question 1
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Prepare with the NSSCAS Chemistry (8224) Practice Questions - Namibia Senior Secondary Certificate Advanced Subsidiary Level Chemistry (Syllabus 8224) Exam practice quiz. This question bank includes 100 questions covering mass, change, relative, energy, and reaction. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NSSCAS Chemistry (8224) Practice Questions - Namibia Senior Secondary Certificate Advanced Subsidiary Level Chemistry (Syllabus 8224) Exam

This practice set contains 100 questions from the matching question bank and focuses on mass, change, relative, energy, and reaction. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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