What is the name given to substances like iron and sulfur, which contain only one type of atom?

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

‘which reaction would most likely require the use of an inert electrode?