For the reaction X + Y yielding Z, X is referred to as the

X is a reactant

Explanation:

The sentence written in the question is correctly represented by a chemical reaction equation as follows;

X+Y> Z

The species on the right hand side of this reaction equation are called reactants while species found on the left hand side of this reaction equation are called products.

This means that X is a reactant.

answerleaving cheese out to get moldy;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.