CBSE · Class 7 · Science · Chapter 2

Exploring Substances: Acidic, Basic, and Neutral

Investigate acids, bases, indicators and neutralisation through substances encountered in everyday life.

5 lessons 40 min
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Lessons in this chapter

  1. 1Using Litmus to Classify SubstancesUse two colours of litmus to turn observations of everyday liquids into evidence about their acidic, basic, or neutral nature.
  2. 2Everyday Acids, Bases, and Red RoseConnect familiar food experiences with acids, then prepare and use a flower indicator to test everyday samples.
  3. 3Turmeric and Indicators You Can SmellInvestigate turmeric and onion indicators, recognise their limits, and use indicator responses to create hidden messages.
  4. 4How Acids and Bases Neutralise Each OtherFollow an acid-and-base investigation and use the idea of neutralisation to reason about soil, waste treatment, and familiar examples.
  5. 5Chapter Summary and PracticeConnect every indicator and the neutralisation investigation, then use evidence to solve mixed problems and plan safe projects.
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