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प्रश्न
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
उत्तर
Chemical change occurs as a result of rearrangement of atoms between two substances.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Fill in the blank.
A new substance is formed in a ............... change.
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
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.
Classify the following as physical or chemical change :
Formation of curd from milk
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Given reason:
Burning of paper is a chemical change.
Select the chemical changes from the following list of changes
Drying of a fruit
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
