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CBSE Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical Worksheet - Free Download
True/False
(i) Rusting of iron is a physical change.
(ii) Evaporation of water is a reversible change.
(iii) All physical changes are reversible.
(iv) Burning of magnesium ribbon produces a white powder.
(v) Bioluminescence produces light without heat.
Fill in the blanks.
(i) Cutting a log of wood into pieces is a ____ change.
(ii) Condensation is a ____ change.
(iii) When carbon dioxide is passed through lime water, it turns milky due to the formation of ____.
(iv) Two methods by which rusting of iron can be prevented are ____ and ____.
(v) Changes in which only ____ properties of a substance change are called physical changes.
(vi) A medicine is the end product of a chain of ____.
Answer the following Questions
Q3. What is the white substance formed when lime water reacts with carbon dioxide?
Q4. What kind of change is chopping vegetables?
Q5. Name the three requirements of the fire triangle.
Q6. Which process breaks down rocks into soil over time?
Q7. What kind of change is melting wax?
Q8. What happens when magnesium ribbon is burnt in air?
Q9. What do you understand by chemical change?
Q10. Why formation of manure from leaves is a chemical change?
Q11. Why tearing of paper into pieces is a physical change?
Q12. What is rusting?
Q13. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Q14. What is a physical change?
Q15. Explain the changes that occur when a candle burns.
For Worksheet Solutions, go to Worksheet Solutions: Changes Around Us: Physical and Chemical
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FAQs on CBSE Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical Worksheet - Free Download
| $1. What is the difference between physical and chemical changes? |  |
Ans. Physical changes are those changes that do not alter the chemical composition of a substance. Examples include melting, freezing, and dissolving. On the other hand, chemical changes result in the formation of new substances with different properties, such as rusting of iron or burning wood.
| $2. Can you provide examples of physical changes in daily life? | |
Ans. Yes! Common examples of physical changes include ice melting into water, chopping vegetables, and dissolving sugar in tea. In all these cases, the original substances retain their chemical identity.
| $3. How can we identify a chemical change? | |
Ans. A chemical change can often be identified by certain indicators such as a change in color, the production of gas (bubbles), the formation of a precipitate, or a change in temperature. These signs indicate that a new substance has been formed.
| $4. Are all physical changes reversible? | |
Ans. Not all physical changes are reversible. For instance, when water evaporates, it can be reversed by condensation. However, breaking an egg is a physical change that cannot be reversed to get the original egg back.
| $5. Why is it important to understand the difference between physical and chemical changes? | |
Ans. Understanding the difference is crucial because it helps in various practical applications such as cooking, recycling, and even in industrial processes. It allows us to predict how substances will behave under different conditions and informs safety measures when dealing with chemical reactions.
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