(N/A) Every substance has unique or characteristic properties. These properties can be classified into two categories: $(i)$ Physical properties and $(ii)$ Chemical properties.
$(i)$ Physical properties: These are properties that can be measured or observed without changing the identity or the composition of the substance. Examples include colour,odour,melting point,density,etc.
$(ii)$ Chemical properties: The measurement or observation of chemical properties requires a chemical change to occur. Examples include acidity,basicity,and combustibility.
Many properties of matter,such as length,area,and volume,are quantitative in nature. Any quantitative observation or measurement is represented by a number followed by the units in which it is measured.