What effect will heating a solid have on it? , CLASS 9 | Matter around us ,

If the atmosphere suddenly condensed into a solid mass and formed a thin layer on the siuface of the earth,what effect would it have on the time of rotation of the earth about it

(a) Which compound of sodium is used for softening hard water? (b) What is the effect of heat on the compounds ? (Write equations for the reactions): (c ) Draw the structure of : (i) BeCI_(2) (in vapour state) (ii) BeCI_(2) (in solid state)

What are harmful effects of using tobacco?

State Joule's law of heating effect of electric current. What is the cause of it ? Is it reversible or not ?