Class 7 Exam > Class 7 Notes > Chemistry Class 7 ICSE > Worksheet: Physical and Chemical Changes
Worksheet: Physical and Chemical Changes | Chemistry Class 7 ICSE PDF Download
Part A: Multiple Choice Questions
Q1. Which of the following is a reversible change?
a) Rusting of iron
b) Burning of paper
c) Melting of butter
d) Cooking of rice
Q2. Which of these is a chemical change?
a) Folding a sheet of paper
b) Dissolving salt in water
c) Freezing water
d) Curdling of milk
Q3. Which change is exothermic (releases heat)?
a) Melting of ice
b) Evaporation of water
c) Burning of a candle
d) Boiling of water
Q4. When a solid directly changes into gas, the process is called:
a) Condensation
b) Boiling
c) Evaporation
d) Sublimation
Q5. Which of these is a man-made chemical change?
a) Growth of a plant
b) Change of seasons
c) Making of chapatti
d) Formation of clouds
Part B: Short Answer Questions
Q6. Why is the melting of ice considered a physical change?
Q7. Differentiate between desirable and undesirable changes with reasoning and examples.
Q8. Why is rusting of iron a chemical change?
Q9. How does temperature affect the rate of evaporation? Explain with reasoning.
Q10. Classify the following as slow or fast changes with reasoning:
Bursting of a cracker
Growth of a plant
Part C: Long Answer Questions
Q11. Explain with steps why burning of paper is a chemical change.
Q12. Compare physical and chemical changes with proper reasoning.
Q13. Ramesh observed these in his kitchen:
Ice cubes melting in a glass.
His mother baking a chapatti.
Water boiling in a kettle.
Classify each as physical or chemical change and give reasoning.
The document Worksheet: Physical and Chemical Changes | Chemistry Class 7 ICSE is a part of the Class 7 Course Chemistry Class 7 ICSE.
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FAQs on Worksheet: Physical and Chemical Changes - Chemistry Class 7 ICSE
| 1. What is the difference between physical changes and chemical changes? |  |
Ans. Physical changes are changes that affect one or more physical properties of a substance without altering its chemical composition. Examples include changes in state, such as melting or freezing. Chemical changes, on the other hand, involve a transformation where the original substances are converted into different substances with new chemical properties, such as rusting of iron or burning of wood.
| 2. Can you provide examples of everyday physical changes? | |
Ans. Everyday examples of physical changes include melting ice into water, dissolving sugar in water, and breaking a glass. In each case, the substance retains its chemical identity and can often be reversed.
| 3. What are some indicators of a chemical change? | |
Ans. Indicators of a chemical change include color change, temperature change (exothermic or endothermic reactions), production of gas (bubbles), formation of a precipitate, and a change in odor. These signs often indicate that a new substance has been formed.
| 4. How does temperature affect physical and chemical changes? | |
Ans. Temperature can significantly impact both physical and chemical changes. For physical changes, increasing temperature can speed up processes like melting or evaporation. In chemical changes, temperature can affect reaction rates; higher temperatures typically increase the energy of the molecules, leading to faster reactions.
| 5. Why is understanding physical and chemical changes important in science? | |
Ans. Understanding physical and chemical changes is crucial in science because it helps in comprehending how substances interact and transform. This knowledge is essential in fields such as chemistry, biology, and environmental science, and is fundamental for applications ranging from cooking to industrial processes and environmental conservation.
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