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Question
Fill in the blank
Changes that occur in nature are called ______
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Solution
Changes that occur in nature are called Natural changes.
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RELATED QUESTIONS
Classify the following as chemical or physical change:
Rusting of almirah
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Is burning a physical change or a chemical change? Why?
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Tick the most appropriate answer.
Photosynthesis requires
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Give an example of a physical change in which the color of the substance changes.
