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Mind Map: Physical and Chemical Change | Science Class 7 (Old NCERT) PDF Download
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FAQs on Mind Map: Physical and Chemical Change - Science Class 7 (Old NCERT)
| 1. What is the difference between a physical change and a chemical change? |  |
Ans.A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as melting, freezing, or dissolving. A chemical change, on the other hand, involves a transformation that alters the chemical structure of a substance, resulting in the formation of new substances, like rusting or burning.
| 2. Can you provide examples of physical changes? | |
Ans.Examples of physical changes include boiling water, freezing ice, dissolving sugar in water, and chopping wood. In each of these cases, the substance remains the same despite the physical alteration.
| 3. What are some common signs of a chemical change? | |
Ans.Common signs of a chemical change include a change in color, the production of gas (bubbles), the formation of a precipitate (solid), temperature changes, and light or sound being produced. These indicators suggest that a new substance has formed.
| 4. How can you tell if a change is reversible or irreversible? | |
Ans.A reversible change is one that can be undone, such as melting ice back into water. An irreversible change cannot be easily reversed, like baking a cake or burning wood. The key is whether the original substance can be recovered after the change.
| 5. Why is understanding physical and chemical changes important in everyday life? | |
Ans.Understanding physical and chemical changes is important because it helps us make informed decisions about various activities, such as cooking, cleaning, and recycling. It allows us to predict how substances will interact and change, ensuring safety and efficiency in our daily tasks.
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