Question

16. What is unit cell?
17. What is the effect on surface tension of temperature?
18. Surface tension is same for different liquids. Explain.​

Answer 1

Answer:

16. the smallest group of atoms which has the overall symmetry of a crystal, and from which the entire lattice can be built up by repetition in three dimensions.

17. In general, surface tension decreases when temperature increases because cohesive forces decrease with an increase of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action of liquid molecules that they have at the interface.

18. No, it depends on the type of intermolecular bonding

Surface tension is caused by attraction between liquid molecules. Different compounds have different levels of attraction. Propanone has permanent dipole-permanent dipole bonds.

Answer 2

Answer:

16) The smallest group of atoms which has the overall symmetry of a crystal,and from which the entire lattice can be built up by repetition in three dimensions.

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