Question

6. Give two reasons to justily
(a) water at room temperature is a liquid
(b) an iron almirah is a solid at room temperature.
7. Why is ice at 273 K more effective in cooling than water at the
same temperature?
3. What produces more severe burns, boiling water or steam?​

Answer 1

Answer:

6.(a) At room temperature (25°C), water is a liquid because it has the following characteristics of liquid: At room temperature, water has no shape but has a fixed volume i.e., it occupies the shape of the container in which it is kept. At room temperature, water flows easily

6.(b) An iron almirah is a solid at room temperature because its melting point as well as boiling point is above room temperature. Similarly, (i) An iron almirah is rigid and has a fixed shape. (ii) The density of metal is quite high. Hence, iron almirah is a solid at room temperature.

7.Ice at 273K is more effective in cooling than water at the same temperature as cie takes latent heat from the substances for melting and hence cools the substances more effectively than water at the same temperature.

3.Steam produces more severe burns than boiling water even though both are at 100oC because steam contains more heat, in the form of latent heat, than boiling water.