Classify each of the following as a homogeneous mixture, heterogeneous mixture, element, or compound: (a) table salt, (b) blood, (c) steel, (d) planet earth.

A homogeneous mixture is a mixture where there is uniformity in property throughout the mixture while a heterogeneous mixture is the one that do not exhibit any uniformity. The given substances are classified as follows:

(a) table salt : homogeneous
(b) blood : heterogeneous
(c) steel : homogeneous 
(d) planet Earth : heterogeneous

1. o2(g)as a product