Question

why there are holes on boarding as well as clothes or plastic banner of advertisements hanged freely? ​

Answer 1

an endothermic reaction takes place only till the reactants are provided with the required energy. justify this statement with an example

Exothermic reactions are generally thermodynamically spontaneous because even if it is accompanied by decrease of randomness ( e.g.,in the condensation of a gas or solidification ofa liquid), the heat releasedis absorbed by the surroundings so that the entropy of the surroundings increases to such an extent that

is positive. <br> (b) The molecules in the vapour state have greater freedom of movement and hence greater randomness than those in the liquid state. Hence, entropy increases in going from liquid to vapour state.

Answer 2

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Since air exerts pressure, wind blowing at a high speed may break or displace things. If holes are made in hanging banners and hoardings, then air can pa§s through these holes. This will reduce the pressure exerted by air on the banners and hoardings and these will not fall easily.

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