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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
विकल्प
True
False
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उत्तर
False.
Correct Statement: Melting of butter and wax are examples of physical changes.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write short answer.
Give an example of desirable change which can also be undesirable
State whether the following is physical or chemical changes.
lightning —
Write true or false
Cutting of paper into pieces is a chemical change.
True or false
In a physical change no net energy change is involved.
Fill in the blank
Heat is ________ by a gas during the process of condensation.
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
Which of the following are physical changes and which are chemical changes ?
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Cutting a log of wood into pieces is a chemical change.
