When a covalent or an ionic bond is formed a chemical change has

Areaction in which products can react to re-form reactants is

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.