The equation Ge + 4H2 -> GeH4

The chemical equation shows the combination of the element Germanium (Ge) and Hydrogen (H₂) to form the compound GeH₄ (Germane). Each molecule of Germanium will combine with 4 molecules of Hydrogen.

Reaction conditions: This reaction is usually carried out under high temperature and high pressure conditions to enhance the combination of the molecules.

Reaction process: During the reaction process, the molecules of Germanium and Hydrogen will interact with each other, leading to the formation of bonds between Ge atoms and H atoms, forming the compound GeH₄.

Phenomena occurring: When the reaction takes place, there will be a release of heat, leading to an increase in temperature of the reaction mixture. The reaction completes when one of the reactants runs out, specifically Ge or H₂. The product of the reaction is GeH₄, a colorless, odorless and very toxic gas.
This is a synthesis reaction, and can also be used to produce pure Germanium from its compounds.