This is a synthesis reaction.
The reactants are hydrogen and nitrogen.
Correctly represented, it's Mg + 2HCl --> MgCl2 + H2, and it's a single replacement reaction.
The single replacement reaction for calcium and hydrochloric acid is: Ca + 2HCl -> CaCl2 + H2
The reaction between copper (Cu) and hydrochloric acid (HCl) to form copper(II) chloride (CuCl2) and hydrogen gas (H2) is a single displacement reaction. This is because the copper replaces the hydrogen in HCl to form CuCl2.
single replacement
In this reaction, zinc (Zn) reacts with sulfuric acid (H2SO4) to form zinc sulfate (ZnSO4) and hydrogen gas (H2). This is a single displacement reaction where zinc replaces hydrogen in sulfuric acid to form zinc sulfate and release hydrogen gas.
Correctly represented, it's Mg + 2HCl --> MgCl2 + H2, and it's a single replacement reaction.
A single replacement reaction will not occur. In a single replacement reaction, either a metal will replace another metal in a compound, or an anion will replace another anion in a compound. Click on the related link to see the Wikipedia article on single displacement (single replacement).
Correctly represented, it's Mg + 2HCl --> MgCl2 + H2, and it's a single replacement reaction.
Displacement reaction , as HCl displaces S of FeS to give H2S
2k + 2h2o --> 2 koh + h2 (Actual chemical symbols are in capital letters, we are having a technical problem.)
Mg + H2CO3 = MgCO3 + H2