Final answer:
HCl and H₂SO₄ are strong acids and should be circled. NaOH is a strong base and should be underlined. CH₃OH does not typically behave as an acid or base and should neither be circled nor underlined.
Step-by-step explanation:
To identify which compounds on the list are acids or bases, we look at their chemical formulas and determine whether they donate protons (H+ ions) in a solution for acids, or accept protons for bases. According to the Brønsted-Lowry theory of acids and bases, an acid is a proton donor, and a base is a proton acceptor.
- HCl (hydrochloric acid) is a strong acid, so we circle HCl.
- NaOH (sodium hydroxide) is a strong base because it contains the hydroxide ion (OH−), so we underline NaOH.
- CH3OH (methanol) is neither a strong acid nor a strong base and does not typically behave as an acid or base.
- H2SO4 (sulfuric acid) is a strong acid, so we circle H2SO4.
Therefore, the compounds HCl and H2SO4 are both strong acids and should be circled. NaOH is a strong base and should be underlined.