Final answer:
True, a compound that is a base according to the Arrhenius definition is also a base according to the Bronsted-Lowry definition, because Arrhenius bases produce hydroxide ions which can accept protons.
Step-by-step explanation:
If a compound is a base according to the Arrhenius definition, it will also be a base according to the Bronsted-Lowry definition. This statement is true. The Arrhenius definition specifies that a base is a substance that dissolves in water to yield hydroxide ions (OH-).
The Bronsted-Lowry definition is more general and includes any substance that can accept a proton (H+). Since Arrhenius bases produce OH- which can accept a proton to form water, they also meet the criteria of Bronsted-Lowry bases. Therefore, all Arrhenius bases are also Bronsted-Lowry bases.