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प्रश्न
What will you take into account while identifying the following?
A physical change in a substance.
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उत्तर
Physical changes are those changes in which only the forms of substances get modified; the chemical natures and compositions of the substances involved are not altered.
Characteristics:
- No new substance is formed during a physical change.
- Most physical changes can be reversed easily.
- The chemical composition of a substance undergoing physical change remains the same.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Fill in the blank.
An earthquake is a .................. change.
Write short answer.
Give an example of desirable change which can also be undesirable
Write true or false
Earthquake is a desirable change.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
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.
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Select the chemical changes from the following list of changes
Drying of a fruit
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
