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प्रश्न
State whether the following is physical or chemical changes.
respiration in living beings —
उत्तर
chemical change,
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संबंधित प्रश्न
Write true or false for the statement.
Deforestation is a man-made change
Classify the following changes as physical or chemical:- melting of a solid (wax)
Define physical change. Give two examples for the above changes.
True or false
In a physical change no net energy change is involved.
Write true or false
Burning of paper and formation of curd are reversible changes.
Classify the following as a physical or a chemical change.
Burning of coal
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
State which of the following pertain to – chemical changes.
(a) Substance retains its identity
(b) The change is permanent
(c) No new substance is formed
(d) Is easily reversible
(e) Produces one or more new substances by a change in its composition
(f) The change is temporary
(g) The composition and properties of the original substance are not altered.
Give two examples for each of the following cases:
Physical changes which are not reversible.
Which of the following is not a physical change?
