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प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
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उत्तर
- Plant growth: Five types of hormones are found in plants, which cause plant growth through chemical processes.
- Rusting of iron: Iron forms undesirable substances when it comes in contact with moisture.
- Cooking of food: Vapors arise while cooking food which is a chemical change.
- Digestion of food: There are chemicals inside our body for digestion.
- Burning of candle: Oxygen is required for this so it is a chemical change.
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संबंधित प्रश्न
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
State whether the following is physical or chemical changes.
photosynthesis —
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
What will you take into account while identifying the following?
A physical change in a substance.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
When solute is dissolved in a solvent it forms a solution.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
