The equation Pb + 2H2 -> PbH2

1. Detailed Information about the Equation Pb + 2H₂ -> PbH₂
   The chemical equation above describes the reaction process between lead (Pb) and hydrogen gas (H₂) to produce PbH₂. In this equation, Pb is the reactant, H₂ is the oxidizer, and PbH₂ is the product of the chemical reaction.

2. Reaction Conditions
   For the reaction to take place, lead and hydrogen gas need to be brought to an appropriate temperature. Specifically, the temperature needs to be increased to a level high enough to cause a reaction between these two substances.

3. Reaction Process
   The reaction process occurs in the direction from lead and hydrogen gas to form PbH₂.

4. Phenomena Occurring
   When the reaction occurs, lead will interact with hydrogen gas, leading to the creation of PbH₂. This product will escape from the reaction site as vapor or gas.

Note: However, the above equation does not reflect a real reaction under normal conditions. Lead does not react with hydrogen under normal conditions. The chemical reaction between lead and hydrogen usually only occurs at very high temperatures and high pressures. Also, currently no complex PbH₂ compound is known in chemistry.