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Students explain why the metal where some lemon juice had been spilt appears shiny.

Students answer two multiple-choice questions on pH.

Task: Using the given pH, classify 10 common substances as acidic, basic, or neutral. Assessment focus: knowledge of the pH scale

This practical task has two parts. The first part of this practical requires students to observe the effects of different indicators on different substances. Students use these results to identify if some other substances are acid, alkali, or neutral.

Task: Students read a pH scale to determine how it shows the increasing strength of an acid and a base solution and decide from different pH products what the effect would be on an acidic soil. Assessment focus: interpreting a pH scale.

Students use a table of some substances and their pHs to answer four questions.

Students consider the potential for chemical change when a range of everyday substances are mixed. They use logical reasoning to work out the consequences of four pairs of reactions.