🔬 KSSM · Form 5 · Age 17

Chemical ratios, moles and equations

542 exam-format practice questions · Science, Form 5 · Free to start

Lesson overview

Chemical ratios, moles and equations is a core Science topic in the Malaysian KSSM syllabus for Form 5 (age 17). Students are expected to understand the key concepts, apply them to exam-format questions, and explain their reasoning clearly. This page gives you 542 practice questions written to the exact KSSM DSKP scope — try the samples below, then create a free account (no card needed) to practise the full set with instant marking and step-by-step coaching.

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Q1. What is the definition of one mole of a substance?

A.The amount of substance that contains as many particles as there are atoms in exactly 12 g of carbon-12

B.The mass of one atom of an element expressed in grams

C.The volume occupied by 1 g of any gas at standard temperature and pressure

D.The number of protons found in the nucleus of an atom

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Q2. What is the definition of one mole of a substance?

A.The mass of one atom in grams

B.The amount of substance containing 6.02 x 10^23 particles

C.The volume occupied by 1 gram of gas at STP

D.The number of protons in the nucleus of an atom

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Q3. What is the relative atomic mass of Carbon-12 defined as?

.1 gram

.12 grams

.Exactly 12 units

.6 units

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