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प्रश्न
Fill in the blank.
The process of a liquid changing into a solid is called ________
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उत्तर
The process of a liquid changing into a solid is called freezing.
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संबंधित प्रश्न
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Classify the following changes as physical or chemical: curdling of milk
State the various conditions that favour the process of evaporation.
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
Name a chemical change which takes place in presence of:
True or false
In a physical change no net energy change is involved.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Classify the following as a physical or a chemical change.
Melting of wax
When solute is dissolved in a solvent it forms a solution.
Explain the characteristics of physical change with examples.
