2) a) Differentiate between Boiling and Evaporation. (3M)
b) What is molecule? Give its types. (2M)
Answers
Answer:
Differences between Evaporation and Boiling
Evaporation
Boiling
Evaporation is a normal process that occurs when the liquid form changes into the gaseous form; while causing an increase in the pressure or temperature.
Boiling is an unnatural process where the liquid gets heated up and vapourized due to continuous heating of the liquid.
Evaporation usually occurs on the surface of the liquid being heated up.
Boiling usually occurs on the entire mass of the liquid that gets heated up.
Bubbling effect is not visible in Evaporation.
Bubbling effect is visible during the process of Boiling.
The process of Evaporation is usually a slow and carried out process when compared to Boiling.
The process of Boiling is usually much quicker and the process happens quite rapidly as well.
b. A molecule is defined as two or more atoms of the same element different element that are bound together. A molecule may be homonuclear, which means, it consists of atoms of one chemical element, as with oxygen (O2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2O).
Explanation:
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2a) Evaporation:
Evaporation is a normal process that occurs when the liquid form changes into the gaseous form; while causing an increase in the pressure or temperature.
Boiling:
Boiling is an unnatural process where the liquid gets heated up and vapourized due to continuous heating of the liquid.
2b) Definition:
A molecule is the smallest particle of a pure substance (elements and compounds) which has independent existence. It exhibits all the properties of that pure substance.
The two types of molecules are:
- Molecules of an element,
- Molecules of a compound.
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