Advertisements
Advertisements
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
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Explain the following giving an example.
Pure substance
What are man-made changes ?
State the various conditions that favour the process of evaporation.
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Select the chemical changes from the following list of changes
Butter turning rancid
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 |
Which of the following is a physical change?
