Question

please solve this....... ​

Answer 1

Answer:

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HI I AM ALSO IN CLASS 9 NICE TO MEET YOU THIS IS WRITTEN BY ME

괜찮아요. 그런데 왜 9 번 코스를 이수하 시나요?

did you understand????

Answer 2

1)a) 20°C

b)197°C

2a) 298K

b)646K

3a)Napthalene balls dissappear with time due to sublimation without leaving any solid. They directly change from solid to gas without going through the liquid phase.

b) We can smell perfume even if we sit metres away since the perfume diffuses in the air all throughout and spreads evenly from a region of higher concentration to lower concentration.

4) oxygen <water < sugar

5a) liquid b) ice/solid c) gas

6a)Water at room temperature is liquid since the boiling point of water is 100°C and the freezing point is 0°C. So anything that lies in between, water will be found in liquid form.

b) An iron almirah is solid at room temperature since the melting point of iron is 1,538 °C. Therefore at room temperature, it remains solid.

7)Ice at 273K is more effective in cooling than water at the same temperature as ice takes latent heat from the substances for melting and hence cools the substances more effectively than water at the same temperature.

8)steam

9)A - melting, B- vapourization, C - condensation, D - solidification E- sublimation, F - Deposition