Science (086) — AI-generated practice question

A chemical equation must be balanced to satisfy the law of conservation of mass, which states that mass can neither be created nor destroyed in a chemical reaction. This means the number of atoms of each element must be equal on both the reactant side (LHS) and the product side (RHS) of the equation.

Source: Chapter 1, Section 1.1.2 Balanced Chemical Equations

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• The examiner expects two key points: (1) mention of the law of conservation of mass, and (2) equal number of atoms on both sides.
• Do not just say "atoms are equal" — name the law; that's where the marks are.
• One sentence on the law + one sentence on what it implies (equal atoms) = full 2 marks.