D. Give reasons.
1. When the temperature falls, the
intermolecular space decreases.
2. Water forms droplets.
3. Brownian motion is not observed in solids
4. Boiling of a liquid takes place from any
point within the liquid
5. Evaporation takes place only at the surface
6. When a gas is cooled to a certain point, it
condenses.
7. The melting point and freezing point of a
substance are the same.
Answers
Explanation:
1)On cooling gases and liquids, temperature falls intermolecular attraction increases intermolecular space between molecules decreases.
2) Surface tension causes water to form spherical droplets and allows it to support small objects, like a scrap of paper or a needle, if they are placed carefully on its surface. Water molecules inside the center of the droplet have more neighboring water molecules to interact with than water molecules at the surface.
3)The Brownian movement is due to the bombardment of collodial particles by the molecules of dispersion medium which are in the constant motion like molecules in a gas.
4)Some high energy particles on the liquid surface may have enough energy to escape the intermolecular forces of attraction of the liquid and become a gas. ... When a liquid reaches its boiling point bubbles of gas form in it which rise into the surface and burst into the air.
Answer:
1)
With decrease in intermolecular space, the intermolecular forces increases as force between two particles are inversely proportional to the square of the distance between the two particles.