Is diamond an element, a compound, or a mixture?

Most metamorphosis processes take place

What is a difference between a mixture of elements and a mixture of compounds

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?