Question

PLEASE HELP!!!

Which of the following shows a chemical reaction in which magnesium and hydrogen sulfide are the reactants and magnesium sulfide and hydrogen are the products?
A. magnesium sulfide + hydrogen → magnesium + hydrogen sulfide
B. magnesium + hydrogen sulfide → magnesium sulfide + hydrogen
C. magnesium + magnesium sulfide → hydrogen sulfide + hydrogen
D. magnesium + hydrogen → magnesium sulfide + hydrogen sulfide

Answer 1

B. Magnesium + Hydrogen Sulfide (Reactors) ----> Magnesium Sulfide + Hydrogen (Products)

Answer 2

B. Mg +
`H_(2)S` ⇒ MgS +
`H_(2)`

Step-by-step explanation:

There are several types of chemical reactions depending on the reaction mechanisms: combination, single-displacement, double-displacement, combustion, decomposition, combustion and redox reactions.

In this case we have a single-displacement reaction, which means that a new chemical species (Mg) replaces other (H) in a given chemical compound (
`H_(2)S`). It happens because the electronegativity of H (a nonmetal) is greater than the Mg electronegativity. Thus H attracts the electrons strongly.

That's why there is a transference of electrons from Mg to
`H^(+)`. We can say that Mg reduces
`H^(+)`.

Once
`H^(+)` is reduced to H, a covalent bond is formed between two hydrogen atoms, and then
`H_(2)` is released as a gas.