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प्रश्न
Digestion of food is a physical change.
विकल्प
True
False
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उत्तर
Digestion of food is a physical change- False.
Correct statement
Digestion of food is a chemical change.
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संबंधित प्रश्न
Write true or false for the statement
Decomposition of leaves is a fast change.
State whether the following is physical or chemical changes.
shaping a piece of glass —
Classify the following as physical or chemical change :
Growth of a plant
Distinguish between the following.
Physical change and chemical change
What will you take into account while identifying the following?
A chemical change in a substance.
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.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Sublimation of Iodine is a ______.
