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प्रश्न
Select the chemical changes from the following list of changes
Respiration in mammals.
उत्तर
Respiration in mammals is a CHEMICAL change, we breathe in oxygen and breathe out carbon dioxide. It is irreversible and composition changes.
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संबंधित प्रश्न
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Classify the following changes as physical or chemical.
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.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
Boiling of milk.
Select the chemical changes from the following list of changes
Breaking of glass
Filling up a balloon with hot air is a _______ change.
Gas exists in three states as solid, liquid, and gas.
Give an example of a physical change in which the color of the substance changes.
