who discovered it?
Carl Wilhelm Scheele.
Oxygen
It is also commonly claimed that oxygen was first discovered by Swedish pharmacist Carl Wilhelm Scheele. H
what is the chemical composition of the earth Iron, oxygen, silicon, magnesium, sulphur, nickel, calcium and aluminum to name a few. how did this place get its name? Its developed, via Middle English, from an Old English noun. what is the climatic conditions on it? It can be subdivided into specific latitudinal belts of approximately homogeneous climate. what the construction of it from the inside? It is divided into layers by their chemical or physical (rheological) properties; crust, mantle, liquid outer core and solid inner core. how would you describe the exterior? Of the total surface area of Earth, about 70% s below sea level and covered by ocean water. from the chemical mentioned above, what are the properties of the first one? Magnetic and mechanical properties. at what rate does it liquify? he melting point of iron is experimentally well defined for pressures less than 50 GPa. is it an important element in the food humans eat? Yes, what can happen if they have too much of it? Iron overload disorders, known medically as hemochromatosis. what foods are they found in? Red meat, oysters, lentils, beans, poultry, fish, leaf vegetables, watercress, tofu, chickpeas, black-eyed peas, and blackstrap molasses. what about the second chemical mentioned above, how was it discovered? By heating mercuric oxide and various nitrates.
wiki:25633187
Oxygen [SEP] Discovery
This discovery of Sendivogius was however frequently denied by the generations of scientists and chemists which succeeded him. It is also commonly claimed that oxygen was first discovered by Swedish pharmacist Carl Wilhelm Scheele. He had produced oxygen gas by heating mercuric oxide and various nitrates in 1771–2. Scheele called the gas "fire air" because it was then the only known agent to support combustion. He wrote an account of this discovery in a manuscript titled "Treatise on Air and Fire", which he sent to his publisher in 1775. That document was published in 1777. In the meantime, on August 1, 1774, an experiment conducted by the British clergyman Joseph Priestley focused sunlight on mercuric oxide (HgO) contained in a glass tube, which liberated a gas he named "dephlogisticated air".