Mg+Hcl=MgCl2+H2

Mg + 2HCl ==> MgCl2 + H2

The chemical equation you provided is a representation of a reaction between magnesium (Mg) and hydrochloric acid (HCl) to produce magnesium chloride (MgCl2) and hydrogen gas (H2). To understand how this reaction occurs, you can look at the balanced chemical equation.

To balance the equation, you need to ensure that the number of atoms on both sides of the equation is equal. Here's how you can do it:

1. Start by writing the skeleton equation: Mg + HCl → MgCl2 + H2.

2. Count the number of atoms on each side of the equation:
On the left side: 1 magnesium (Mg) and 1 chlorine (Cl) from HCl.
On the right side: 1 magnesium (Mg), 2 chlorines (Cl) from MgCl2, and 2 hydrogens (H) from H2.

3. Balance the equation by adjusting the coefficients in front of each compound. In this case, it is already balanced as it is. The balanced equation remains: Mg + 2HCl → MgCl2 + H2.

Now that you have a balanced equation, you can understand the reaction. When magnesium (Mg) reacts with hydrochloric acid (HCl), magnesium chloride (MgCl2) and hydrogen gas (H2) are formed. This is known as a single displacement reaction, where magnesium, being more reactive than hydrogen, displaces hydrogen from hydrochloric acid.

Overall, the reaction between Mg and HCl is represented by the balanced equation: Mg + 2HCl → MgCl2 + H2.