Burned Mg Strip:

When a burned magnesium strip is reacted with hydrochloric acid (HCl), the following reaction takes place:

```

MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l)

```

In this reaction, the burned magnesium oxide (MgO) reacts with the hydrochloric acid to form magnesium chloride (MgCl2) and water (H2O). The reaction produces a white precipitate of magnesium hydroxide, which is insoluble in water. The reaction is exothermic, which means it releases heat.

Unburned Mg Strip:

When an unburned magnesium strip is reacted with hydrochloric acid (HCl), the following reaction takes place:

```

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

```

In this reaction, the unburned magnesium metal (Mg) reacts with the hydrochloric acid to form magnesium chloride (MgCl2) and hydrogen gas (H2). The reaction produces a colorless solution of magnesium chloride and bubbles of hydrogen gas. The reaction is also exothermic, releasing heat.

Comparison of Reactions:

The reactions between burned and unburned magnesium strips with HCl are similar in that they both produce magnesium chloride and release heat. However, there are some key differences between the two reactions:

* The reaction between burned Mg and HCl produces a white precipitate of magnesium hydroxide, while the reaction between unburned Mg and HCl does not.

* The reaction between unburned Mg and HCl produces bubbles of hydrogen gas, while the reaction between burned Mg and HCl does not.

These differences are due to the different compositions of the starting materials. Burned Mg contains magnesium oxide, while unburned Mg contains magnesium metal. The magnesium oxide in burned Mg reacts with HCl to form magnesium hydroxide, while the magnesium metal in unburned Mg reacts with HCl to form hydrogen gas.