Is it possible to ascertain the "true" nature of reality since the question of the types of substance involves that which is metaphysical?
No, but it is possible to develop a form of obsessive-compulsive disorder that involves that sort of thing.
People have faith in many different types of things, and their faith may or may not have any metaphysical meaning. If I have faith that Barack Obama will make wise decisions as President, that is not metaphysical. If I have faith that the universe was created by God, that is a form of metaphysical faith. Faith may or may not be well placed. It is equally possible to have faith in something that is true, or in something that is false. In either case, you will believe. Having faith spares you from uncertainty. It is a way of settling issues for which no definitive evidence may exist. Metaphysical issues are often of this type. If you don't want to conclude that you don't know, you can always accept some metaphysical claim purely on faith. That is your privilege.
No, it is not possible for the specific heat of a substance to have a negative value.
The metaphysical possibility of time travel is a topic of philosophical debate. Some argue that time travel could be possible if certain conditions are met, such as the existence of parallel universes or the bending of spacetime. Others believe that time travel is not metaphysically possible due to the inherent contradictions and paradoxes it may create.
you cannot PNP-NPN looks the same but with a meter it is possible to check diode continuity therefore ascertain the type
No, a chemical reaction involves the rearrangement of atoms to form new substances with different properties. It is not possible to retrieve the original substance once it has undergone a chemical reaction.
The answer depends on what substance is in the balloon and the substance which forms the exterior environment. Since there is no information on either, it is not possible to answer the question.
Yes, it is possible if one of the substance will sublime and others will not.
Radioactive waste is nearly always a mixture but it is possible to be a pure substance.
saturated solution
It is not possible to electrolyze a solid substance because in order for electrolysis to occur, the substance needs to be dissolved in a liquid or molten form to allow for the movement of ions. Solids do not allow for this movement of ions required for electrolysis to take place.
No, it is not always possible to determine if a substance is pure just by its appearance. Impurities can be present in small amounts and may not be visible to the naked eye. Chemical analysis is typically needed to accurately determine the purity of a substance.