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Class 7 Science Chapter 2 Mindmap - Exploring Substances: Acidic, Basic and Neutral

Class 7 Science Chapter 2 Mindmap - Exploring Substances: Acidic, Basic and Neutral

The document Class 7 Science Chapter 2 Mindmap - Exploring Substances: Acidic, Basic and Neutral is a part of the Class 7 Course Science Olympiad Class 7.
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FAQs on Class 7 Science Chapter 2 Mindmap - Exploring Substances: Acidic, Basic and Neutral

1. What are the main characteristics of acidic substances?
Ans. Acidic substances have a sour taste, turn blue litmus paper red, and can conduct electricity in solution. They typically have a pH value less than 7 and can release hydrogen ions (H+) when dissolved in water.
2. How do basic substances differ from acidic substances?
Ans. Basic substances have a bitter taste, feel slippery, turn red litmus paper blue, and usually have a pH value greater than 7. They can release hydroxide ions (OH-) in solution and are often used in cleaning products.
3. What is a neutral substance, and how is it different from acids and bases?
Ans. A neutral substance has a pH value of 7, meaning it is neither acidic nor basic. Water is a common example of a neutral substance. Unlike acids and bases, neutral substances do not change the color of litmus paper.
4. Why is the pH scale important in understanding acidic and basic substances?
Ans. The pH scale measures the acidity or basicity of a substance on a scale from 0 to 14. It helps us understand how strong or weak an acid or base is, which is crucial in chemistry, biology, and environmental science.
5. Can you give examples of everyday acidic and basic substances?
Ans. Yes! Common acidic substances include lemon juice, vinegar, and stomach acid. Basic substances include baking soda, soap, and ammonia. These substances play important roles in cooking, cleaning, and even our body’s functions.
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