With easy 8th grade math!
which of the following is an example of observational scientific investigation?

a)mixing two reactants together in a small beaker.

b)drying solid produced by placing it in an oven.

c)placing test tubes in an ice bath for 15 minutes.

d)noting the color of a solution when heated.

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: