Three Foundational Activities

The source chapter uses simple demonstrations to anchor the topic. Burning a cleaned magnesium ribbon in air produces a bright flame and white magnesium oxide ash. Adding dilute hydrochloric or sulphuric acid to zinc granules releases hydrogen gas and changes the temperature of the vessel. Mixing lead nitrate and potassium iodide solutions forms a yellow precipitate of lead iodide. These are not random lab tricks; together they cover the most common reaction signals: energy release, gas evolution, and precipitate formation.

Activity	Observation	Concept reinforced
Magnesium + oxygen	Bright light, white ash	New product formed
Zinc + dilute acid	Bubbles, warmer flask	Gas evolution and temperature change
Lead nitrate + potassium iodide	Yellow solid appears	Precipitation

Lab note: the textbook explicitly warns that magnesium burning should be handled with teacher assistance and with eye protection because the flame is intense.

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