Question

7. Why is ice at 273 K more effective in cooling than water at the
same temperature?
8. What produces more severe burns, boiling water or steam?
9. Name A,B,C,D,E and F in the following diagram showing
change in its state

Answer 1

Answer:

7=At 273 K, ice absorbs more heat than water from the substance to overcome the latent heat of fusion and thus providing a more effective cooling effect. Water however does not absorb any extra heat from the substance. Thus, ice is more effective in cooling than water at 273 Kelvin.

8=Now, as water is in a gaseous state in steam, it can be given further heat and its temperature will increase, so steam always has higher temperatures than boiling water. Hence we can say that steam produces more severe burns than boiling water.

9=Interconversion of three states of matter: Any state of matter can be converted into other states with the help of temperature or pressure.

(A) Solid to Liquid→ Fusion

(B)Liquid to Gas→Vaporisation

(C)Gas to liquid→Condensation

(D)Liquid to Solid →Solidification

(E) Solid to Gas→Sublimation

(F)Gas to Solid →Sublimation

Answer 2

Explanation:

7. At 273 K, ice absorbs more heat than water from the substance to overcome the latent heat of fusion and thus providing a more effective cooling effect. Water however does not absorb any extra heat from the substance. Thus, ice is more effective in cooling than water at 273 Kelvin.

8. Now, as water is in a gaseous state in steam, it can be given further heat and its temperature will increase, so steam always has higher temperatures than boiling water. Hence we can say that steam produces more severe burns than boiling water.

9. images is a answer for 9th question