Question

1. Convert the following temperatures to the celsius scale.
(a) 293 K
(b) 470 K.
2. Convert the following temperatures to the kelvin scale.
(a) 25°C
(b) 373°C.
3. Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
(b) We can get the smell of perfume sitting several metres
away:
4.Arrange the following substances in increasing order of forces
of attraction between the particles, water, sugar, oxygen.
What is the physical state of water at-
(a) 25°C
(b) 0°C
(c) 100°C ?​

Answer 1

Explanation:

a) 293 K = (293 – 273)

= 20 °C

b) 470 K = (470 – 273)

= 197 °C

2)(a) 25° C = (25 + 273) K

= 298 K

(b) 373° C = (373 + 273) K

= 646 K

(3)(a) Naphthalene balls undergo sublimation due to which it converts directly into vapours and disappear into air without leaving any solid.

(b) Molecules with higher kinetic energy diffuses quicker. That is the reason we can smell the perfume sitting several meters away. ...

4) force of attraction between sugar is more than force of attraction between water

5)(a) liquid

(b) can be soliid /liquid or both

c) can be gas/liquid or both

hope it help u better

thanku