Read the following chemical equation.

mg(s) + h+ cl− → mg2+ cl− + h2

what most likely happens during this reaction?
magnesium gains two electrons.
magnesium loses two electrons.
chlorine gains one electron.
chlorine loses one electron.

Answer

Hi,

In this equation, i see we have two answers;

B. Magnesium loses two electrons

C. Chlorine gains one electron

Explanation

Due to their valences, Magnesium,Mg+2 and Chlorine -1, magnesium atom will loose two electrons to form a stable state 2+ ions.Chlorine as a member of group 7 elements of the periodic table, the chlorine atom will gain 1 electron to form a stable 1- ion and facilitate the formation of the ionic bond that occurs between the two elements.

Magnesium loses two electrons

Step-by-step explanation:

The balanced equation is  

Mg + 2H⁺ + 2Cl⁻ ⟶ Mg²⁺ + 2Cl⁻ + H₂

Mg loses two electrons because it becomes Mg²⁺:

Mg ⟶Mg²⁺ + 2e⁻

C and D are both wrong, because Cl⁻ neither gains nor loses electrons. It is Cl⁻ at the beginning and Cl⁻ at the end of the reaction, so it is a spectator ion.

The substance that gains electrons is H⁺:

2H⁺ + 2e⁻ ⟶ H₂

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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