In the reaction X+Y (R) Z, Z is the

A)Substrate
B)Product
C)Enzyme
D)Carbon Molecule

To determine the answer to this question, we need to understand the basic concepts of a chemical reaction and the roles of the different components involved. In a chemical reaction, reactants are converted into products through the breaking and forming of chemical bonds.

In the given reaction, X+Y (R) Z, X and Y are the reactants. Reactants are the substances that undergo a chemical change in a reaction. Therefore, neither X nor Y is the correct answer.

Now let's look at the remaining options:

A) Substrate: Substrate refers to the reactant(s) that directly interact with an enzyme in an enzyme-catalyzed reaction. In this given reaction, there is no mention of an enzyme, so Z is not a substrate.

C) Enzyme: An enzyme is a biological catalyst that facilitates chemical reactions by lowering the activation energy. Since there is no mention of an enzyme in the given reaction, Z is not an enzyme.

D) Carbon Molecule: The given reaction does not specify the chemical identity of the reactants or products. Without any information regarding the composition of X, Y, or Z, we cannot determine if Z is a carbon molecule or not.

Therefore, the correct answer is:

B) Product: In a chemical reaction, products are the substances produced as a result of the reaction. In the given reaction X+Y (R) Z, Z is the product.