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प्रश्न
Write true or false
Earthquake is a desirable change.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
burning of sugar —
State the Differences Between a Physical Change and a Chemical Change.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
What will you take into account while identifying the following?
A physical change in a substance.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Water is the universal solvent. Why?
