Aloaf of bread has a mass of 500g and a volume of 2500 cm3. what is the density of the bread?

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:

In a ball-and-stick molecular model, what do the sticks represent?

What causes the appearance of lines in a emission spectrum