Question

CHEMISTRY
1) Convert 250 c to the Kelvin scale.
3) What happens to the hest energy which is supplied to the solid once it stan
3) What is dry ice? Why is so called? How is it prepared?
2) A rubber band can change its shape on stretching will you classiyas
e its shape on stretching will you classify it as solid or not? Justify
your answer.
5) Give reasons :
a) When a solid melts, its temperature remains the same, although the beat 1
continuously.
b) Rate of mixing of particular varies with temperature.
c) (CNG) is used as fuel these days in vehicles.
6) a) Coz is a gas. Write its two gaseous properties to justify it.
b) How can we liquefy a gas?
c) Write the full form of CNG and LPG.
Account for the following:
a) When sugar crystals dissolve in water, the level of water does not rise appreciable.
b) Doctors advise to put strips of wet cloth on the forehead of a person having high fever
c) Dogs generally hang out their tongue in summer.
a) Define diffusion. Explain the rate of order of diffusion in solids, liquids and gases.
b) State the effect of temperature on diffusion.
How is rate of evaporation affected by change in the following? Justify your answer by
a suitable example in each.
a) Temperature b) Wind speed c) Humidity
10) 5 ml of water was taken in a test tube and china dish separately. These samples were th
under different conditions as below:
a) Both the samples are kept under a fan.
b) Both the samples are kept inside a cupboard.
9)
State in which case evaporation will be faster? Give reasons to support your answer.
How will the rate of evaporation change if above activity is carried out on a rainy day​

Answer 1

Answer:

1) 1c=273k

250c=250+273k

250c=523k

ans=523k