Hey guys do answer my questions.
Very short answer questions (VSA) Mention the two types of molecular forces.
What is molecular range?
3. What is a sphere of influence?
4 Why are brick walls plastered with cement?
does ink get absorbed by a blotting paper? In summer cotton dress is preferable. Give reasons.
Why
7. What is the cause of kerosene rising through the wicks of a stove?
8. Mention a liquid which does not wet glass. 9. Mention a liquid which wets glass.
10. Define surface tension and write its SI unit.
11. Define surface energy.
12. What is meant by angle of contact?
13. What is meant by capillarity?
14. Mention the formula relating surface tension and capillary rise.
15. Mention any one application of surface tension.
16. Why drops and bubbles are spherical in shape?
17. What happens to the surface tension of water when soap is added to it?
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Answers
Answer:
The Molecular range is the radius around a molecule in a substance to which the molecule can exert attraction force on another molecule. This is distance. ... The molecular range is very small like 1 nanometer. Surface tension is the surface energy - additional energy required to increase surface by a unit area.
3) a country or area in which another country has power to affect developments although it has no formal authority.
4)Because cement, when mixed with water, transforms into a paste that sets, hardens and binds the bricks together, thus making a rigid structure of wall.
5) Blotting paper absorbs ink by the process of capillary action. ... All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.
7) Due to presence of pores (narrow spacings) in the wick, capillary action takes place, which makes the oil to rise in the wick.
8) Liquids that rise in small-bore tubes inserted into the liquid are said to wet the tube, whereas liquids that are depressed within thin tubes below the surface of the surrounding liquid do not wet the tube. Water is a liquid that wets glass capillary tubes; mercury is one that does not.
10) Surface tension, represented by the symbol γ (alternatively σ or T), is measured in force per unit length. Its SI unit is newton per meter but the cgs unit of dyne per centimeter is also used.
11) Surface free energy or interfacial free energy or surface energy quantifies the disruption of intermolecular bonds that occurs when a surface is created.
12) the angle between the meniscus and the containing walls of a column of liquid measured from the vertical wall below the surface of the liquid to the position of the tangent to the meniscus at its point of contact with the wall.
13) the tendency of a liquid in a capillary tube or absorbent material to rise or fall as a result of surface tension.
15) Some notable applications of surface tension are: A needle placed on water can be made to float due to the surface tension of water. Warm water is used for washing purpose as heating increases the surface area and reduces surface tension. ... Antiseptics like Dettol have low surface tension, so that they spread faster.
16) The attractive force of surface tension causes the bubbles to take spherical shape. Because a sphere has the smallest surface area compared to other shapes with the same volume occupied, so it enables the particles to pack together close enough to achieve the tightest possible grouping than any other shape.
17) Adding soap lowers the water's surface tension so the drop becomes weaker and breaks apart sooner. Making water molecules stick together less is what helps soaps clean dishes and clothes more easily.
Explanation: