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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.
संबंधित प्रश्न
Write true or false for the statement
A natural change can also be a desirable change
What is a chemical change ? Give two examples of chemical changes.
Which of the following are physical changes and which are chemical changes ?
Fill in the blank.
The process of a liquid changing into a solid is called ________
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Natural changes which take place in nature on their own, are beyond the control of human being.
Cutting a log of wood into pieces is a chemical change.
Mention a few physical properties of a substance.
