3. Chose chemical change from the following
(a) Decaying.(b) tearing of paper, (e) precipitation, (d)
Sublimation
Answers
Answer:
a) Evaporation of petrol is a physical change as no new product is formed only physical state changes.
b) Burning of Liquefaction of petroleum gas is a chemical change as new products are formed.
c) Heating iron rod to red hot is a physical change as no new product is formed; only temporary change (increase in temperature) occurs.
d) Curdling of milk is a chemical change as a new product in the form of curd is formed whose chemical composition is different from milk.
e) Sublimation of ammonium chloride is a physical process in which solid-state changes to gaseous one.
Hence the correct option is D.
Answer:
decaying
Explanation:
tearing of paper
in this paper after tearing is paper so it's a physical change
precipitation
in this water after precipitation is water so it's a physical change
sublimation
in this camphor after sublimation is camphorso it's a physical change
Therefore decaying is a chemical change