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प्रश्न
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
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उत्तर
BURNING OF MAGNESIUM RIBBON is chemical change as It is
- Irreversible change
- New product with new properties is formed (MgO)
- It is a permanent change
- Composition is changed
- Energy is required to bring the change.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Melting of ice is a physical change.
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
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- Melting of ice
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Compare the energy changes involved during a physical and a chemical change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
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- A physical change is generally ______.
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