Chemistry
Match the following:
| Column A | Column B |
|---|---|
| (a) Freezing of water | (i) Natural change |
| (b) Change of seasons | (ii) Chemical change |
| (c) Burning of wood | (iii) Physical change |
| (d) Permanent change | (iv) Sublimation |
| (e) Heating of solid camphor | (v) Fast process |
Phy & Chem Changes
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Answer
| Column A | Column B |
|---|---|
| (a) Freezing of water | (iii) Physical change |
| (b) Change of seasons | (i) Natural change |
| (c) Burning of wood | (v) Fast process |
| (d) Permanent change | (ii) Chemical change |
| (e) Heating of solid camphor | (iv) Sublimation |
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Related Questions
Assertion (A): Burning of a candle is a physical change.
Reason (R): When a candle burns, some of its wax melts and gets solidified on cooling. Also carbon dioxide and water vapour are formed which cannot be recovered easily and converted back into the candle.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.
Fill in the blanks:
(a) The process of a liquid changing into a solid is called …………… .
(b) A change which alters the composition of a substance is known as a …………… change.
(c) There is no change in the …………… of the substance during a physical change.
(d) The reaction in which energy is evolved is called …………… .
(e) The process in which a substance in solid state directly changes into ............... is called sublimation.
Name the following:
(a) The solid formed when vapours of a sublimable substance cool down.
(b) The compound formed when magnesium burns in air.
Write true or false against the following statements and correct the false ones.
(a) Heating of an iron rod is a chemical change.
(b) Condensation of steam is not a chemical change.
(c) Rusting of iron is a fast change.
(d) A physical change is reversible.
(e) There is a change in the mass of a substance in a physical change.