2. State reason for the following: (i) Naphthalene balls disappear with time without leaving any solid. (ii) Your palm feels cold when you pour some nail polish remover on your palm.
Answers
Answer:
(i) Napathalene ball is a sublime substance. It changes from solid to gaseous state without passing into the liquid state.When kept in open the napathalene ball get sublimated and the gaseous vapour go to the atmosphere and no solid is left behind and the ball disappears
(ii) nail paint remover particles gain energy from our palm for evaporation and this gives a feeling of coolness and we feel a cooling sensation
Answer:
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Explanation:
Naphthalene undergoes sublimation easily; the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep forming naphthalene vapours that disappear into the air with time without leaving any solid.
Nail polish remover is acetone that evaporates as soon as it pours on the surface. Evaporation causes cooling as liquid changes to water vapour by absorbing heat from the surface and leaving the surface cool.