Why do solids have a regular geometrical shape?
In solids, the particles have highly ordered arrangement because the intermolecular forces between the particles are very strong. Therefore, solids have a regular geometrical shape.
When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water?
When we place few crystals of potassium permanganate in a beaker containing water, we get two distinct layers-colourless water at the top and pink colour at the bottom. After few…
Kinetic energy of particles of water in three vessels A, B and C are EA, EB and Ec respectively and EA> EB>EC Arrange the temperatures, TA, TB and Tc of water in the three vessels in increasing order.
Tc < TB < TA, the kinetic energy of particles is greater at higher temperature.
Can materials exist in all the three states?
Yes, materials can exist in all the three states under different conditions of temperature and pressure.
Why do we see water droplets on the outer surface of a glass containing ice cold water?
The water vapour present in the air comes in contact with cold surface of the glass, loses its energy and gets converted into droplets of water.
Why do the gases exert more pressure on the Wall of the wall of the container than the solids?
In gases, the particles move randomly at high speed and they collide with each other and with the container.
In which of the following, the particles have highest forces of attraction? Water, NaCI (solid), ice or, wax.
NaCl (solid) has particles with the highest forces of attraction.
Define density and give its SI unit.
Density of a substance is defined as the mass per unit volume. Its SI unit is kgm-3