Martin P. answered • 08/19/22
Tutor
5.0
(549)
graduate chemistry work, Doctorate degree, Former College Professor
A) Air is a mixture of different gas molecules Nitrogen, Oxygen and smaller amounts of other gases.
B) Steel is made up primarily of the elements iron and carbon not chemically combined but melted together making it a mixture.
C) Carbon is an element made up only of carbon atoms.
D) Water is a compound made up of 2 atoms of hydrogen combined chemically with one atom of oxygen in definite proportions.
