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प्रश्न
What kind of change is shown by tearing of paper?
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उत्तर
Tearing of paper is a physical change that cannot be reversed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
Name a chemical change which takes place in presence of:
What is a physical change ? Give two examples of physical changes.
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
When solute is dissolved in a solvent it forms a solution.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Match the items of Column I with the items of Column II.
| Column I | 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 |
