Answer;
-Macroscopic properties remain constant
-Concentrations remain constant
-No change to copper solution seen;
-Rate of reverse/backwards reaction = rate of forward reaction;
Explanation;
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system.
-It is a a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they are formed, react to produce the original reactants.
C. Ne
down here is the list of monoatomic elements, just for you :)
Experiments are usually done under the fumehood because the chemical processes will sometimes creates noxious or toxic gases
unknown chemical reaction could potentially create toxic fumes so generally a safety issue
sulfur dioxide will create a rotten egg smell off the top of my head which is used in order to detect gas leaks, wouldnt want to be smelling that, thinking there's a gas leak, evacuating the building, only to realize it was from an experiment or accidental mixture in the waste bin