1. Convert the following temperatures to the celsius scale.
(a) Naphthalene balls disappear with time without leaving
(b) We can get the smell of perfume sitting several metres aw
French
(a293 R
(b) 170 K
2. Convert the following temperatures to the Kelvin scale.
(b) 373 C.
de son for the following observations,
solid.
1. Arrange the following substances in increasing order of for
of attraction between the particles - water, sugar, oxygen.
6. What is the physical state of water at -
(al 25 C
(b) O C
(c) 100 C2
6. Give two reasons to justify-
(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
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 showin
change in its state
Answers
Answer:
373°C = 373 + 273 = 646 K
Explanation:
The increasing order of forces of attraction between the given particles of water, sugar and oxygen is
Oxygen <a) 25 º C
Water at 25°C is present in the liquid state.
The water which we use for our day to day activities is in the liquid state.
The water which we use for drinking, cooking, washing, etc all are in a liquid state.
(b) 0ºC
At 0°C, water exists in solid-state.
We know that the freezing point of water is 0 °C.
The liquid form of water starts to become solid (ice) at this temperature.
Example: If you keep an ice cube tray filled with water and freeze it for a few hours, you may observe the cubes where you poured water have become solid. Ice is the solid-state of water.
(c) At 100ºC
At 100°C, water exists in a gaseous state.
We know that the boiling point of water is 100°C.
The water starts to evaporate after attaining this high temperature.
Example: When you boil water in your home, after some time you observe the vapours coming out of the vessel. These vapours are the gaseous state of water.Water < Sugar.