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In iron carbon diagram carbon is considered as free carbon or combined carbon?

In: Chemistry, Mechanical Engineering, Elements and Compounds [Edit categories]

Relevant answers:

Is carbon combined?
Yes, carbon is always combined with something in nature
Is there carbon in iron?
No. Carbon is an element with atomic symbol C. Iron is another element with atomic symbol Fe.
What are carbons that have carbon-carbon double bonds called?
alkenes
Can carbon molecules rotate in a carbon-carbon bond?
Yes, if it is a single (sigma bond). A double or triple (pi) bond cannot be rotated without breaking the bond.
Is there more carbon in carbon dioxide or carbon monoxide?
There is proportionally more carbon in carbon monoxide than there is in carbon dioxide. Carbon monoxide, CO, has a one-to-one ration of carbon to oxygen. Carbon dioxide, CO2, has a one-to-two ration...