Will give ! ❤ consider the half reactions below for a chemical reaction. what is the overall equation for this chemical reaction? first image: problem second image: a third image: b fourth image: c fifth image: d

A. Mg(s) + 2H^(+)(aq) → Mg^(2+)(aq) + H_2(g)

Step 1. Add the two equations and get

Mg(s) + 2H^(+)(aq) + 2e^(-) → Mg^(2+)(aq) + H_2(g) + 2e^(-)

Step 2. Cancel species that appear on each side of the arrow.

The electrons cancel and you get

A. Mg(s) + 2H^(+)(aq) → Mg^(2+)(aq) + H_2(g)

“B.” is wrong because it contains electrons.

“C.” is wrong because it has reversed reactants and products.

“D.” is wrong because there is no H in any of the half-reactions

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.