Question

a brønsted-lowry base is a compound that: accepts a hydrogen ion. supplies a peroxide ion. supplies a hydride ion. accepts an amide ion. accepts an hydroxide ion.

Explanation:

According to the Brønsted - Lowry theory, a base is defined as a substance that can accept a hydrogen ion ($H^{+}$). Let's analyze each option:

• Option 1: "accepts a hydrogen ion" aligns with the Brønsted - Lowry definition of a base.
• Option 2: "supplies a peroxide ion ($O_{2}^{2 - }$)" is not related to the Brønsted - Lowry concept of a base.
• Option 3: "supplies a hydride ion ($H^{-}$)" is not relevant to the Brønsted - Lowry base definition.
• Option 4: "accepts an amide ion ($NH_{2}^{-}$)" is not in line with the Brønsted - Lowry theory.
• Option 5: "accepts an hydroxide ion ($OH^{-}$)" is not the Brønsted - Lowry definition. The Brønsted - Lowry focus is on hydrogen ion transfer.

Answer:

accepts a hydrogen ion.