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प्रश्न
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Are any new products formed during the above process.
उत्तर
The change is permanent and new products are formed – i.e. glucose and oxygen.
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संबंधित प्रश्न
What is the physical state of water at 25°C.
Mention a change which is always desirable.
What do you observe when :
water is boiled
What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?
What is the name of the process in which a solid turns directly into a gas ?
What is the chemical name of dry ice ?
Define 'boiling point' of a substance ? What is the boiling point of water ?
Define the following term Boiling.
How is ammonia gas liquefied ?
Which of the following process/processes release heat ?
- condensation
- vaporisation
- freezing
- melting
Which one of the following set of phenomena would increase on raising the temperature ?
On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be :
Define the following terms: Liquefaction
Give reasons:
Why a solid does not flow, but a liquid flows?
The process by which a solid changes into a liquid is called
State whether the following statement is true or false. If false write the correct statement.
During a chemical change the composition of the original substance is not altered and the change is irreversible.
Give the reason for the following
On heating a sublimable solid, the molecules break free & escape from the surface of the solid directly into vapour.
Prepare a model to demonstrate movement of particles in solids, liquids and gases.
For making this model you will need
- A transparent jar
- A big rubber balloon or piece of stretchable rubber sheet
- A string
- Few chickpeas or black gram or dry green peas.
How to make?
- Put the seeds in the jar.
- Sew the string to the centre of the rubber sheet and put some tape to keep it tied securely.
- Stretch and tie the rubber sheet on the mouth of the jar.
- Your model is ready. Now run your fingers up and down the string by first tugging at it slowly and then rapidly.
