Question

2HCl+Mg=MgCl2+H2 Получается: Mg+2H(+)=Mg(2+)+H2 Почему?????? Почему заряды 0?

Answer 1

Заряды простых веществ всегда равны нулю

Answer 2

In the chemical reaction you provided:

2HCl + Mg = MgCl2 + H2

The equation is balanced, and it shows the reaction between hydrochloric acid (HCl) and magnesium (Mg) to produce magnesium chloride (MgCl2) and hydrogen gas (H2).

When writing chemical equations, we use coefficients to balance the number of atoms on each side of the equation to obey the law of conservation of mass. The coefficients indicate the number of molecules or moles of each substance involved in the reaction.

In this reaction, the coefficients are: 2HCl + Mg = MgCl2 + H2

The reaction involves 2 moles of hydrochloric acid (HCl) reacting with 1 mole of magnesium (Mg) to produce 1 mole of magnesium chloride (MgCl2) and 1 mole of hydrogen gas (H2).

Regarding the charges, the equation does not show charges explicitly, but we can infer them from the context and the periodic table.

Hydrogen (H) has a valence of +1, meaning it usually loses one electron to form a +1 charge. In this equation, it reacts with magnesium, which has a valence of +2. To form the product, hydrogen loses one electron to become H+ (a proton), and magnesium loses two electrons to become Mg2+.

So, the overall ionic equation for the reaction, showing charges, would be:

2H+ + Mg = Mg2+ + H2

However, in typical chemical equations, we often omit the charges for simplicity, especially in basic reactions without polyatomic ions. So, the equation is commonly written without charges as:

2HCl + Mg = MgCl2 + H2

Remember that charges are crucial in determining the nature of chemical reactions, but they might not always be explicitly mentioned in simplified chemical equations.