This experiment-based test on oxidation and reduction is designed for lower secondary chemistry (grades 7–9) and fits perfectly into CLIL and bilingual science classrooms. The assessment is closely connected to hands-on experiments, especially the rusting of iron, while remaining clear and self-contained.

Students analyze real experimental observations such as color changes, surface transformations and measurable mass increases caused by oxygen uptake. This approach helps learners understand that oxidation is not limited to burning but also includes slow chemical processes. Reduction is introduced as the complementary process and explained in a clear, age-appropriate way.

The reading text provides a solid scientific foundation and supports comprehension in bilingual settings. Tasks are structured along three cognitive levels: describing basic concepts, analyzing experimental data, and evaluating oxidation and reduction processes in everyday contexts.

A comprehensive 100-point marking scheme ensures transparent assessment and focuses on scientific accuracy, depth of explanation and clarity of language. This resource is ideal for inquiry-based chemistry lessons with a strong experimental focus.