Carbon dating used determine age earth
Carbon dating used determine age earth - not mandating
The physical properties of carbon vary widely with the allotropic form.For example, graphite is opaque and black while diamond is highly transparent.
For example, graphite can be oxidised by hot concentrated nitric acid at standard conditions to mellitic acid, C Carbon sublimes in a carbon arc which has a temperature of about 5,800 K (5,530 °C; 9,980 °F).It does not react with sulfuric acid, hydrochloric acid, chlorine or any alkalis.At elevated temperatures, carbon reacts with oxygen to form carbon oxides, and will rob oxygen from metal oxides to leave the elemental metal.Under normal conditions, diamond, carbon nanotubes, and graphene have the highest thermal conductivities of all known materials.All carbon allotropes are solids under normal conditions, with graphite being the most thermodynamically stable form at standard temperature and pressure.They are chemically resistant and require high temperature to react even with oxygen.
The most common oxidation state of carbon in inorganic compounds is 4, while 2 is found in carbon monoxide and transition metal carbonyl complexes.
It is present as a powder, and is the main constituent of substances such as charcoal, lampblack (soot) and activated carbon.
At normal pressures, carbon takes the form of graphite, in which each atom is bonded trigonally to three others in a plane composed of fused hexagonal rings, just like those in aromatic hydrocarbons.
Carbon's abundance, its unique diversity of organic compounds, and its unusual ability to form polymers at the temperatures commonly encountered on Earth enables this element to serve as a common element of all known life.
It is the second most abundant element in the human body by mass (about 18.5%) after oxygen.
Graphite is soft enough to form a streak on paper (hence its name, from the Greek verb "γράφειν" which means "to write"), while diamond is the hardest naturally occurring material known.