Question

Classify the following changes as physical or chemical changes. burning of coal spoiling of food cutting wood , inflating a balloon.​

Answer 1

Explanation:

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.