The smallest unit of a substance that cannot be broken down further and maintain its properties is known as which of the following? biotic
element
abiotic
molecule

All of the following are part of the biosphere except

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:

State one important difference between a physical change and a chemical change?