Hotchquizz for APChem is designed to help memorize essential polyatomic ions that new students to AP Chemistry find hard to memorize. It provides a detailed quiz, a list of the quizzed items, and a favorites list in which users can log polyatomic ions they found difficult. Test yourself with the provided quizzes repeatedly to enhance your understanding of polyatomic ions, and save the hardest ones to your favorites list to visit them again before a quiz or test.