In a recrystallization of benzoic acid, you begin with a sample of 4.00 grams. After several recrystallizations, a dry sample of 3.45 grams was obtained experimentally. What was your percent recovery? (The format of your answer is important, e. g. 33.2 percent would be entered as 33.2 without any percent symbol or the word percent.)

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Which statement best describes the function of enzymes?