Sulfur is an element and therefore homogeneous.
Gold is an element
Sodium hydroxide is a chemical compound.
Pure quartz is a homomogeneous crystal.
In the broadest sense, there was no "first person", even if we only ask who was the first person who was a modern human, a member of Homo sapiens. This is because we could not say definitively that this person was finally a Homo sapiens,but that his or her parents were still Homo erectus. Evolution is simply too gradual for such simple answers. What we do know is that the first Homo sapiens evolved over two hundred thousand years ago.We could regard our Homo erectus ancestors as people, although not yet modern humans, or even their Homo habilisancestors as people. Many scientists regard their more ancient predecessors as too primitive and too different to really be people in the sense that we usually use the word. So there would be a broad consensus that Homo habilis were the first people on earth.
Enlil became bothered by the noise from homo sapiens.
Gold is an element
A pure element or a pure compound are homogeneous.
Aluminium is a chemical element.
As this compound contains zinc, oxygen and sulfur atoms, it is heteroatomic.
Maple syrup is a homogeneous mixture.
Sulfur was first identified as a distinct element (not as a compound of other elements) in about 1777, by Antoine Lavoisier.However, sulfur (which is the 10th-most common element in the universe) is naturally occurring, both in pure and compounded forms. Humans have used sulfur in its various forms for all of recorded human history, and well back into pre-history (it has demonstrated use back through our cave-man times). Thus, humanity first discovered sulfur at least 40,000 years ago, and likely it was used by some of Homo Sapiens' ancestor species before then (meaning, possibly back a million years or more).
Due to dust particles and dissolved gases in the droplets of rain it is a heterogeneous mixture.
Ammonia is a compound, not a gas.
Sugar (sucrose) is a compound not a mixture.
Copper is a chemical compound not a mixture.
Aluminium is an element, not a mixture.
Nitrogen is a chemical element not a mixture.