The symmetry of a molecule (or any other object) tells us whether it is chiral. A molecule is "achiral" (not chiral) if it has an axis of symmetry.
ð ə WORD_BOUNDARY s ɪ m ə t ɹ i WORD_BOUNDARY ə v ə WORD_BOUNDARY m ɑ l ɪ k j uː l WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY ɛ n i WORD_BOUNDARY ʌ ð ə ɹ ɹ WORD_BOUNDARY ɑ b d̠ʒ ɛ k t WORD_BOUNDARY t ɛ l z WORD_BOUNDARY ʌ s WORD_BOUNDARY w ɛ ð ə ɹ ɹ WORD_BOUNDARY ɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY k aɪ ɹ ə l WORD_BOUNDARY ʌ WORD_BOUNDARY m ɑ l ɪ k j uː l WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ t̠ʃ ɜː ɹ ə l WORD_BOUNDARY n ɑ t WORD_BOUNDARY k aɪ ɹ ə l WORD_BOUNDARY ɪ f WORD_BOUNDARY ɪ t WORD_BOUNDARY h ʌ z WORD_BOUNDARY ʌ n WORD_BOUNDARY æ k s ɪ s WORD_BOUNDARY ʌ v WORD_BOUNDARY s ɪ m ə t ɹ i WORD_BOUNDARY