This experiment-based test on gas identification is designed for lower secondary chemistry (grades 7–9) and supports CLIL and bilingual science teaching. The assessment is closely linked to hands-on classroom experiments and remains fully self-contained.

Students analyse classic gas tests such as the glowing splint test for oxygen, the squeaky pop test for hydrogen, and the limewater test for carbon dioxide. Observable effects are used to identify invisible substances, reinforcing scientific reasoning and experimental thinking.

The detailed reading text explains the scientific background in age-appropriate language and highlights the model character of gas tests. Tasks are structured along three cognitive levels: recalling gas tests, analysing experimental observations, and evaluating their importance for safety and everyday life.

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