Common Chemistry Mistakes That Cost Marks

Every year, examiners report the same mistakes appearing in thousands of student scripts. These are not obscure errors — they are well-known misconceptions and sloppy habits that cost marks on the most common question types.

This lesson catalogues the most frequent Chemistry mistakes and teaches you how to avoid each one. Study this lesson carefully — correcting even a few of these could gain you several extra marks across both papers.

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Misconception 1: Confusing Atoms, Molecules, Elements, Compounds, and Mixtures

This is the most fundamental error in Chemistry, and it appears at every level.