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Changes Around Us | Chapter 10 | 8th Science - Student Activities | 8th Science : Chapter 10 : Changes Around Us

Chapter: 8th Science : Chapter 10 : Changes Around Us

Student Activities

8th Science : Chapter 10 : Changes Around Us : Student Activities with Questions Answers, Solution

Activity 1

Adithya wants to classify the following changes as physical or chemical. Can you help him?

1. Melting of ice

2. Ripening of fruits

3. Rusting of iron

4. Spoilage of food

5. Burning of wood

6. Bursting crackers

7. Burning of camphor


Activity 2

Take two test tubes and couple of rust free iron nails. In one test tube pour some water and put an iron nail. Keep the test tube opened for few days. Take another test tube and pour some water along with some coconut oil. Now, place the second iron nail. Leave the set up for a few days. Observe the changes and record them. Which iron nail gets rusted and why?


Activity 2

Take two test tubes and couple of rust free iron nails. In one test tube pour some water and put an iron nail. Keep the test tube opened for few days. Take another test tube and pour some water along with some coconut oil. Now, place the second iron nail. Leave the set up for a few days. Observe the changes and record them. Which iron nail gets rusted and why?


Activity 3

Buy some fresh yeast from a grocery shop. Prepare a paste of wheat flour with water in a vessel. Add some yeast and leave the vessel closed for few hours under sunlight. Observe the changes closely. What do you infer?


Activity 4

Take two clean test tubes. Take sulphuric acid in one test tube and a solution of sodium hydroxide in another tube. Slowly and carefully add sodium hydroxide solution to sulphuric acid. Touch the sides of test tube. What do you feel? What do you infer?


Activity 5

Take a clean test tube. Add some dilute hydrochloric acid. Drop a piece of magnesium or a piece of zinc metal. What do you see? Now bring a burning match stick near the mouth of the test tube. What do you hear? What do you infer?


More to know

The head of a matchstick contains potassium chlorate and antimony trisulphide. The sides of the matchbox contain red phosphorous.

The term electrolysis was introduced by Michael Faraday 19th in the century. The word electrolysis is acombinationoftwo terms‘electron’ and ‘lysis’. Electron is relatedto electricity and lysis means decomposition


More to Know

Chemical reactions accompanying evolution of heat are called exothermic reactions. Whereas chemical reactions which involve absorbtion of heat are called endothermic reactions.

Limestone is the raw material for quicklime, slaked lime and cement.


The ultraviolet rays from the sun break ozone (O3) molecules in the stratosphere into molecular oxygen and atomic oxygen. This atomicoxygen again combines with molecular oxygen to form Ozone.

More to Know

Photochemistry is the branch of chemistry which deals with chemical reactions involving light.

Enzymes and yeasts are called  biocatalysts.



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