While many compounds that contain one or more hydrogen atoms can behave as acids according to the Bronsted-Lowry definition, not all of them are classified as Arrhenius acids. The key distinction lies in the ability of the compound to dissociate in water and release hydrogen ions (H+).

According to the Arrhenius definition of acids, a substance is considered an acid if it dissociates in water to produce hydrogen ions (H+). This definition heavily emphasizes the ionization process and the presence of free H+ ions in the solution.

Many compounds that contain hydrogen atoms do not undergo ionization in water. This means they do not release H+ ions when dissolved, and therefore, they do not meet the criteria to be classified as Arrhenius acids. For instance:

1. Hydrocarbons: Hydrocarbons, such as methane (CH4) or benzene (C6H6), are composed solely of carbon and hydrogen atoms. However, they do not ionize in water and do not release H+ ions. Thus, they are not considered Arrhenius acids.

2. Alcohols: Alcohols, such as ethanol (CH3CH2OH), contain both carbon-hydrogen bonds and an -OH (hydroxyl) group. Despite having a hydrogen atom bonded to an oxygen atom, alcohols undergo very limited ionization in water. The -OH group releases a proton (H+) to a very small extent, forming hydronium ions (H3O+). However, the extent of ionization is negligible compared to strong acids. Hence, alcohols are not classified as Arrhenius acids.

3. Ammonia (NH3): Ammonia is a compound of nitrogen and hydrogen. However, it behaves as a base rather than an acid in water. When dissolved in water, ammonia undergoes a reaction called protonation, where it accepts a proton from water, forming ammonium ions (NH4+) and hydroxide ions (OH-). Therefore, ammonia is not an Arrhenius acid.

In contrast, compounds like hydrochloric acid (HCl), sulfuric acid (H2SO4), or nitric acid (HNO3) are classified as Arrhenius acids because they readily dissociate in water, releasing significant amounts of hydrogen ions.

In summary, while many compounds contain hydrogen atoms, only those that undergo ionization in water and release hydrogen ions (H+) are classified as Arrhenius acids according to the strict definition. Compounds that do not ionize to a significant extent, like hydrocarbons, alcohols, or ammonia, are not considered Arrhenius acids.