Identify the process occurring in each of the following:
a) Mothballs slowly disappear.
B) A cold wind shield becomes covered with ice when struck by rain drops.
Answers
Mothballs are made of naphthalene which is an organic compound with a significant vapor pressure. When a compound evaporates without melting, it is said to sublime. That is what naphthalene does. It very slowly passes from the solid state-the little pellets, to the vapor phase. In a sealed space, the vapors build up to a level that is toxic to moths and the larvae.
B) The chemical substance we are dealing with here is water. On a very cold day if a person does not have their windshield defrost on, raindrops falling from the sky onto the freezing windshield will turn into ice. When this happens, water is going from a liquid state to a solid state. This process is the act of freezing.
Condensation is the act of a substance changing from a gaseous state to a liquid state. An example of this in a driving situation is when you are driving on a very damp, cold day without the air conditioning compressor turned on. The damp air inside the car comes into contact with the cold windshield and fogs up the glass. This is the act of condensation, where the water vapor in the air turns into liquid micro-droplets on the windshield. Turning the compressor dries out the air inside the car, thus eliminating the condensation on the windshield obstructing your view.
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Answer:
a) Sublimation.
b) Freezing.
Explanation:
a) Mothball is made up of napthalene which shows subkimation i.e. change of vapour state from solid state. Therefore Mothball starts to sublime and disappear over time.
b) Rain drops when touch the cold wind shield it maybe possible that the temperature decreases below the freezing point of water in which case it gets converted into ice and thereby the wind shield gets covered by ice because of the rain drops getting struck.
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