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प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
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उत्तर
Revolution of the earth around the sun is a natural periodic change.
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संबंधित प्रश्न
Write true or false for the statement
A natural change can also be a desirable change
Classify the following changes as physical or chemical:-boiling
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false
Decomposition of leaves is a fast change.
A physical change is temporary. Explain.
Give four difference between physical and chemical changes.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Mention some of the different conditions needed for chemical changes to occur.
