00:01
Good day, the topic is about properties of matter.
00:04
Properties of matter can be chemical or physical in nature.
00:07
Physical properties can be observed without the need to change the chemical identity of a substance, whereas chemical properties can only be observed when the substance undergoes chemical change, in which process it undergoes alteration of its chemical identity.
00:25
So in this problem, we wish to identify which describes a chemical.
00:30
Property of a substance.
00:32
So again, chemical property can be observed if the substance undergoes a chemical reaction in which process the substance reacts with another substance to form a different substance.
00:44
So note that when iron bar rust, iron, the component of the most steel will react with oxygen in the air and such reaction would perform a different compound commonly known as rust.
01:01
So from here alone, we say that iron rusting is a type of property of iron that is chemical in nature...