Classify the following into elements,compounds,and mixtures:
$(a)$ Sodium $(b)$ Soil $(c)$ Sugar solution $(d)$ Silver $(e)$ Calcium carbonate $(f)$ Tin
$(g)$ Silicon $(h)$ Coal $(i)$ Air $(j)$ Soap $(k)$ Methane $(l)$ Carbon dioxide $(m)$ Blood

(N/A) Elements: These are pure substances consisting of only one type of atom. Examples: Sodium,silver,tin,and silicon.
Compounds: These are pure substances formed by the chemical combination of two or more elements in a fixed proportion. Examples: Calcium carbonate,methane,and carbon dioxide.
Mixtures: These are substances formed by the physical mixing of two or more components in any proportion. Examples: Soil,sugar solution,coal,air,soap,and blood.