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प्रश्न
Write the properties of this substance.
Water
उत्तर
- Water is a liquid state.
- Properties of water are fluidity, density, solubility, transparency and thermal conductivity.
संबंधित प्रश्न
Convert the following temperature to the Kelvin scale.
373°C
What do you observe when :
water is boiled
Tick the most appropriate answer.
Chemical changes involve
What do you understand by the term 'latent heat' ? What are the two types of latent heat ?
Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.
Define the following terms: Condensation
State which of the three states of matter Le. solids, liquids or gases – have
(a) No definite volume
(b) A definite shape
(c) High density
(d) No free surfaces
(e) Particles – which diffuse very easily.
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.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During liquefaction, the particles ________ energy.
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.
