MATTER IN OUR SURROUNDINGS
Chapter 1 MATTER IN OUR SURROUNDINGS
- Convert the following temperatures to the celsius scale.
(a) 293 K (b) 470 K.
- Convert the following temperatures to the Kelvin scale.
(a) 25°C (b) 373°C.
- 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.
- 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 ?
- Give two reasons to justify—
(a) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature.
- Why is ice at 273 K more effective in cooling than water at the same temperature?
- What produces more severe burns, boiling water or steam?
- Name A,B,C,D,E and F in the following diagram showing change in its state