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प्रश्न
Classify the following processes into physical or chemical changes:
- Beating of aluminium metal to make aluminium foil.
- Digestion of food.
- Cutting of a log of wood into pieces.
- Burning of crackers.
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उत्तर
- Beating of aluminium metal to make aluminium foil – physical change
- Digestion of food – chemical change
- Cutting of log of wood into pieces – physical change
- Burning of crackers – chemical change
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
FILL IN THE BLANK
Positively charged ions are called ........
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Name the gases which turn moist red litmus blue.
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Write a note on the catalyst.
