Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.
Chair, air, almonds and cold drink
Give reasons for the following observation:The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.
Solids diffuse at a very slow rate. But, if the temperature of the solid is increased, then the rate of diffusion of the solid particles into air increases. This is due to an increase in the kinetic energy of solid particles. Hence, the smell of hot sizzling food reaches us even at a distance, but to get the smell from cold food we have to go close.
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
This observation shows that the particles of matter have intermolecular spaces. The intermolecular spaces in liquids is fair enough to let the diver pass through it.
The characteristics of particles of matter are:
→ Particles of matter have spaces between them.
→ Particles of matter are continuously moving.
→ Particles of matter attract each other.
The mass per unit volume of a substance is called density (density = mass/volume).
Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron.
air, Exhaust from chimneys, cotton, water, honey, chalk, and iron.