Explain the reason of the following.
a)
Why respiration is considered an exothermic reaction?
b)
Why do we apply Paint on iron articles?
c)
Why plaster of Paris should be stored in a moisture proof container?
d)
Why do acids not show acidic behaviour in a absence of water?
e)
Why does distilled water not conduct electricity whereas rainwater does?
Answers
Answer:
a)Respiration is another exothermic reaction. and this reaction releases energy. However, energy is usually transferred as heat energy, so one way to tell if a chemical reaction is happening is to use a thermometer. If the temperature increases during a chemical reaction then that is an exothermic reaction.
B)We apply paint of iron Articles to prevent rusting.
C)Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum
D)The acidic behaviour of acid is due to the presence of hydrogen ions. The acids will not show its acidic behaviour in the absence of water, this is because acids do not dissociate to produce H+(aq) ions in the absence of water
E)Distilled water is a pure type of water which does not contain any ions in it. ... These gases dissolve in water to form some kind of acids like carbonic acids which dissociates to give ions. Thus rainwater is conducting electricity while distilled water is not conducting electricity
Answer:
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A.
Carbolydrates present in food are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. This reaction is known as respiration. hence,respiration is considered as an exothermic reaction.
B.
Iron articles are painted to prevent them from rusting. After painting iron surface does not come in contact with moisture and air which cause rusting.
C.
Plaster of Paris in contact with moisture (water) changes to solid hard mass, gypsum. Therefore, it gets wasted. Hence it should be stored in moisture proof containers.
D.
The acidic behaviour of acid is due to the presence of hydrogen ions. The acids will not show its acidic behaviour in the absence of water, this is because acids do not dissociate to produce H+(aq) ions in the absence of water.
E.
Distilled water is a pure type of water which does not contain any ions in it.These gases dissolve in water to form some kind of acids like carbonic acids which dissociates to give ions. Thus rainwater is conducting electricity while distilled water is not conducting electricity.