Question

1. Name the physical state of matter which can be easily
compressed
2. Name a substance which sublimes.
3. Define evaporation.
4. Name the physical state of matter which is most rigid.
5. Give the characteristics of liquid.
6. Define (i) melting point and (ii) boiling point.
7. The boiling point of ethyl alcohol is 78.6°C. Explain it
in Kelvin scale.​

Answer 1

Answer:

1 gas

2iodine

3the phenomenon due to which liquid changes to vapour at any temperature;below its boiling point.

4 solid

5 it has no fixed shape but definite volume.

6 the minimum temperature at which substance melts melting point of water is 0°C

the minimum temperature at which sub boils the boiling point of water is 100°C

7 most of this difference results from the ability of ethanol and other alcohols to form intermolecular hydrogen bonds.

in Kelvin it is 351.76 °k

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Answer 2

Answer:

(1)Gas

(2)Salt

(3)Evaporation is the process of changing from a liquid or solid state into vapor (like fog, mist, or steam).

(4)Solid

(5)(i)Melting point: The constant temperature at which a solid changes into liquid is called melting point.

(ii)The constant temperature at which a liquid starts changing into gas is called boiling point.

(6)351K

Explanation:

We Know,

Temperature on Kelvin Scale =Temperature on Celsius Scale+27k

So,

Here, The Temperature in Kelvin Scale is =(78+273)K

=351