10. Give reasons for the following:
(a) Burning of wood is a chemical change.
(b) An earthquake is a natural and undesirable change.
(c) Sublimation of ammonium chloride is a temporary and reversible change.
(d) Growing of seedling into a plant is a slow and irreversible change.
Answers
Answer:
a) Because Buring of Wood makes Ash which is a Major Example of Chemical Change .
b) Yes , because it cannot be undone and causes Great Destruction .
c) I dont know this one .
d)Yes because it also cant be undone and it's a slow change
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Answer:
a) The burning of wood leads to the formation of new substances like ash(carbon), carbon dioxide gas, water vapour, heat and light. This change is irreversible and hence a chemical change. While cutting wood into smaller pieces is a physical change as there is no change in the original composition of wood.
b)Earthquake are undesirable because undesirable changes are those changes which are not beneficial . earthquake destroys everything and those things are not remain useful for us.
c)Sublimation is the process in which a solid is converted to gas by heating and then the gas can cooled to get back the solid substance. Therefore, sublimation of ammonium chloride is a temporary and reversible change.
d)The germination of a seed is a slow and irreversible process as it takes few days to months to germinate a seedling from a seed, and this is irreversible because the same seedling which grows into a plant cannot revert back in its growth.
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