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प्रश्न
Give two examples of periodic changes.
उत्तर
Swinging of a pendulum
Rising and setting of the sun.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
glowing of a bulb -
Write true or false
Melting of ice is a physical change.
True or false
Is the process of digestion a physical change?
Write true or false
A natural change can also be a desirable change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic 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.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
Physical Change: Boiling::Chemical Change: ______.
Match the items of Column I with the items of Column II
| Column 1 | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
