Question

Exercises
1. Convert the following temperatures to the
(a) 293 K
(b) 470 K
dures to the celsius scale
peratures to the Kelvin scale
(a) 25 C
(b) 373°C
3. Give reason for the following observations.
disappear with time without leaving any
solid
fb) We can get the smell of perfume sitting se
4. Arrange the following substances in increasing
Dell of perfume sitting severd metres away
abstances tn increasing order of foncen
particles water, sugar. oxygen.
(c) 100°C
b) O C
5. What is the physical state of water at
(a) 25°C
(b) OC
6. Give two reasons to justify
fa) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature
7. Why is ice at 273 K more effective in cooling that
Same temperaturen
8. What produces more severe burns, boiling water or sle
9. Name A.B.C.D.E and F in the following diagram
change in its state​

Answer 1

ANSWER 1

a) 293-273= 20°C

b)470-273=197°C

ANSWER 2

a)25+273= 298k

b)373+273=646k

ANSWER 3

A))) Naphthalene balls are sublimate materials they keep on sublimating slowly without leaving any residue...

B))) Particles of matter are constantly moving in a random motion so, they diffuse with the air and reaches us. That's why we can get the smell of perfume sitting several metres away ...

ANSWER 5

a) physical state of water at 25°C is in liquid state .

b) physical state of water at 0°C is both solid and liquid because freezing point of water is 0°C it keeps on freezing at this temperature...

ANSWER 6

a) water at room temperature is a liquid because --

• at room temperature water flows..
• at room temperature water has fixed volume ...

b) iron almirah at room temperature is a solid because --

• at room temperature almirah has fixed shape and volume ..
• at room temperature almirah has rigid form...

ANSWER 7

Ice is more effective in cooling at 273k because it contain the latent heat of fusion and it absorbs latent heat of fusion from our palm...

ANSWER 8

steam

ANSWER 9

not.complete question is written

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