Four factors affect the rate of the reaction:
f ɔ ɹ WORD_BOUNDARY f æ k t ə ɹ z WORD_BOUNDARY ʌ f ɛ k t WORD_BOUNDARY ð ə WORD_BOUNDARY ɹ eɪ t WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY ɹ ɪ æ k ʃ ə n WORD_BOUNDARY