Two pure substances A and B react to form a new pure substance C. From this, we may conclude that?

a. A and B are both elements


b. C is a compound, A and B may or may not be elements


c. C is an element, A and B are compounds


d. A, B, and C are all compounds

Two pure substances A and B react to form a new pure substance C. From this, we may conclude that?
d
Reply:a.





it is because, it was stated that two pure are combined into one, which means the two reactants are the pure substances that cannot be broken down into simpler substances. Also, it has a fixed melting point and boiling point. To form a new substance C, A and B must be chemically combined and a pure substance with different properties from its constituent elements are formed(compound).





option b, is wrong as, a pure substance is either element or compound, however a compound cannot combine with another compound to form a second compound hence it is wrong.





option c. is out as A and B are the reactants not the products.





option d, is also out as mentioned in option b.

columbine