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CBSE Notes
Class 7
Science
Chapter 2 Exploring substances-acidic, basic and neutral

CBSE Notes Class 7 Science Chapter 2 Exploring Substances: Acidic, Basic and Neutral

In our daily life, we come across many substances such as food items, cleaning agents, and medicines. These substances have different properties, and one important way to classify them is as acids, bases, and neutral substances. This chapter introduces students to these three types and helps them understand their characteristics.

Students learn that acids are substances that have a sour taste, like lemon juice and vinegar. Bases are bitter in taste and feel soapy, like soap solution. Neutral substances do not show the properties of either acids or bases. To identify these substances, we use indicators such as litmus paper. Acids turn blue litmus red, while bases turn red litmus blue.

This CBSE Class 7 chapter notes also explain natural indicators like turmeric and china rose, which can also be used to test substances. This makes learning interesting and practical for students.

1.0Download CBSE Class 7 Science Chapter 2 Notes: Free PDF

Get the CBSE Class 7 Science Chapter 2 notes on "Exploring Substances: Acidic, Basic, and Neutral." PDF for clear and organised explanations of acids, bases, indicators, and how to neutralise them. The notes are easy to read and include real-life examples and important ideas. Great for quick review and getting ready for tests, it helps students understand concepts better.

Exploring Substances: Acidic, Basic and Neutral

2.0Key Features of Chapter 2: Exploring Substances: Acidic, Basic and Neutral

  • Classification of Substances: This helps you figure out if a substance is an acid, a base, or neutral by looking at its properties.
  • Indicators: Talks about how to use natural and synthetic indicators, such as turmeric, litmus, and phenolphthalein, to test things.
  • Properties of Acids and Bases: Talks about how acids taste sour and bases feel slippery.
  • Neutralisation Reaction: Shows how acids and bases react to make salt and water, which often gives off heat.
  • Everyday Uses: Links ideas to things we do every day, like using antacids to treat acidity and treating soil on farms.
  • Safety Measures: Highlights the importance of using and handling chemicals safely to avoid harm. 

Frequently Asked Questions

A substance found in nature, like turmeric or litmus, that changes color when it comes into contact with an acid or a base.

An acid and a base react to form salt and water, cancelling out each other's chemical properties

Blue litmus paper turns red when it is dipped into an acidic solution.

A substance with a pH of 7 is considered neutral, meaning it is neither acidic nor basic (like pure water).

Ant bites contain formic acid; calamine is basic and neutralizes the acid to relieve pain and swelling.

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CBSE Chapter-wise Notes for Class 7 Science

Class 7 Science Chapter 1 - The Ever-Evolving World of Science Notes

Class 7 Science Chapter 2 - Exploring Substances – Acidic, Basic and Neutral Notes

Class 7 Science Chapter 3 - Electricity: Circuits and Components Notes

Class 7 Science Chapter 4 - The World of Metals and Non-Metals Notes

Class 7 Science Chapter 5 - Changes Around Us: Physical and Chemical Notes

Class 7 Science Chapter 6 - Adolescence: A Stage of Growth and Change Notes

Class 7 Science Chapter 7 - Heat Transfer in Nature Notes

Class 7 Science Chapter 8 - Measurement of Time and Motion Notes

Class 7 Science Chapter 9 - Life Processes in Animals Notes

Class 7 Science Chapter 10 - Life Processes in Plants Notes

Class 7 Science Chapter 11 - Light: Shadows and Reflection Notes

Class 7 Science Chapter 12 - Earth, Moon and the Sun Notes


NCERT Solutions for Class 7 Science : All Chapters

Chapter 1 : The Ever-evolving World of Science

Chapter 2 : Exploring Substances - acidic, basic and neutral

Chapter 3 : Electricity: Circuits and Components

Chapter 4 : The World of Metals and Non-Metals

Chapter 5 : Changes Around Us: Physical and Chemical

Chapter 6 : Adolescence: A Stage of Growth and Change

Chapter 7 : Heat Transfer in Nature

Chapter 8 : Measurement of Time and Motion

Chapter 9 : Life Processes in Animals

Chapter 10 : Life Processes in Plants

Chapter 11 : Light: Shadows and Reflection

Chapter 12 : Earth, Moon and the Sun