4. NaOH
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What I’m seeing on quizlet says what you’re describing is a ball-and-stick model.
A polar molecule is when the arrangement of the atoms in molecules are unequal where one end of the molecule has a positive charge while the other end has a negative charge. Examples of a polar molecule are water, ammonia, hydrogen sulfide and sulfur dioxide. The opposite is called a nonpolar molecule.
Answer:
A pH less than 7 is acidic