There isn't a single, universally accepted term for "chemical reaction with hydrogen." The name for the reaction depends on what hydrogen is doing and what other substances are involved. Here are some possibilities:

Types of Reactions:

* Hydrogenation: This is the most common term, and it describes the addition of hydrogen to a molecule, usually an unsaturated organic compound. This is often catalyzed by a metal catalyst.

* Reduction: In many cases, hydrogen acts as a reducing agent, meaning it donates electrons to another substance. This is a broad term encompassing many types of reactions.

* Combustion: When hydrogen reacts with oxygen, it burns to produce water and heat. This is a highly exothermic reaction.

* Acid-Base Reactions: Hydrogen ions (H+) play a critical role in acid-base reactions. For example, hydrogen can be released from acids like hydrochloric acid (HCl).

Examples:

* Hydrogenation of an alkene: Ethene (C2H4) reacts with hydrogen to form ethane (C2H6).

* Reduction of a metal oxide: Copper oxide (CuO) is reduced to copper (Cu) by reacting it with hydrogen.

* Combustion of hydrogen: 2H2 + O2 → 2H2O

* Reaction of hydrogen with a base: Sodium hydroxide (NaOH) reacts with hydrogen to form sodium hydride (NaH) and water (H2O).

Important Note:

The term "chemical reaction with hydrogen" is very general. To understand the reaction more fully, you need to know the specifics of what hydrogen is reacting with and what the products are.