(a)
Interpretation:
At the plash point, it is a chemical change (or) physical change should be determined and How about the boiling point of flash point.
Concept introduction:
Physical change: A change in matter in which no new substance is produced. It is may be involved a change of state and it can usually be reversed.
In other words the substances at the beginning are the same before and after the change.
Example: Melting, freezing and dissolving
Chemical change: A change is matter in which one or more new substances are produced. It is difficult to reverse. (or) The substances present at the beginning are not present at the end.
Clues: Heat (or) light may be given off, small, colour change and das may be formed.
Example: Cooking, burning and rusting.
Flash point: Flash point of a liquid is the lowest temperature at which it gives vapour to from an ignitable mixture with air.
(b)
Interpretation:
Flammable and combustible some difference and similarities should be explained.
Concept introduction:
Flammable: It is a property of a material relating how easily the material ignites (or) sustains a combustion reaction.
Ionic liquids are neither volatile nor flammable. But Organic solvents have volatile. They can contribute to air pollution, it’s easily flammable. The ionic liquid may progress the yield and lower the expenses of a chemical process. But Organic solvent is not economic.
Combustion: A
(c)
Interpretation:
The flash point of the liquids is higher or lower at higher altitudes has to be explained.
Concept introduction:
Flammable: It is a property of a material relating how easily the material ignites (or) sustains a combustion reaction.
Flash point: Flash point of a liquid is the lowest temperature at which it gives vapour to from an ignitable mixture with air.
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Chemistry In Context
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