Final answer:
Baking Soda (D) is the ionic compound among the options provided, as its sodium bicarbonate composition involves ionic bonds between sodium ions and bicarbonate ions.
Step-by-step explanation:
Based on physical properties, the substance that is an ionic compound among the options given is D. Baking Soda An ionic compound is formed from ionic bonds, which are electrostatic forces of attraction between oppositely charged cations and anions. Baking soda, or sodium bicarbonate (NaHCO3), consists of sodium ions (Na+) and bicarbonate ions (HCO3-), making it an ionic compound.
Unlike baking soda, the other substances listed do not exhibit properties typical of ionic compounds. Hair gel is mostly water-based with polymers and other ingredients that do not form ionic crystals. A silver bracelet is made of metallic silver, which has a metallic bonding, not ionic. Motor oil is composed of long-chain hydrocarbons, which are molecules with covalent bonds, not ionic.
The features of ionic compounds include high melting and boiling points, being poor conductors of electricity in solid state but conducting well when dissolved in water or molten due to the mobility of ions. Therefore, baking soda with these characteristics is identified as an ionic compound.