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प्रश्न
Select the chemical changes from the following list of changes
Respiration in mammals.
उत्तर
Respiration in mammals is a CHEMICAL change, we breathe in oxygen and breathe out carbon dioxide. It is irreversible and composition changes.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Fill in the blank.
An earthquake is a .................. change.
State the various conditions that favour the process of evaporation.
Distinguish between the following.
Physical change and chemical change
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
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.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Natural changes which take place in nature on their own, are beyond the control of human being.
A physical change is generally____________.
