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Answers
1. Chair, air, smell , almonds, cold drinks and smell of perfume are matter because they occupy space and have mass.
2. It is easier to sip hot tea or milk faster from a saucer rather than from a cup because of evaporation . ... And evaporation causes cooling. So if the surface area is more rate of evaporation is faster and so is the cooling rate. Hence we are able to sip hot tea or milk faster from a saucer rather than from a cup.
3.
i. 300 K. ⇒ 300 - 273 = 27° C.
ii. 573 K ⇒ 573 - 273 = 300° C.
4.
a. Naphthalene balls disappear with time without leaving any solid because they undergo sublimation i.e., they directly change into vapour without passing through the liquid state. ... The perfumes contain solvent which carries pleasant smelling vapour.
b. When perfume is released it quickly changes into vapour. The kinetic energy of gas molecules is high & the rate of diffusion is high. Hence we can smell the perfume sitting several metres away.
5. Ans..in the picture
6. Evaporation is the process of turning from liquid into vapour.
7. Sublimation is the property of substance in which they are converted directly from solid to gas or vice versa. As the ammonium chloride is sublime after heating it will directly converted into vapour and this vapour will again condense at the upper colder part of funnel to form solid ammonium chloride...Diagram in the 2nd pic
Hope this helped...
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