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प्रश्न
Fill in the blank
Heat is ________ by a gas during the process of condensation.
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उत्तर
Heat is released by a gas during the process of condensation.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Fill in the blank.
The reaction in which energy is evolved is called
Given reason:
Burning of paper is a chemical change.
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.
In a solution of salt in water, water is the solute
Water is the universal solvent. Why?
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Which of the following is not a physical change?
