Which statement is true about oxidation-reduction reactions? a. every oxidation must be accompanied by a reduction. b. there are four commonly accessed oxidation states of carbon. c. dehydrogenases typically remove two electrons and two hydrides. d. they usually proceed through homolytic cleavage. e. during oxidation a compound gains electrons.

Two things that biomedical has invented or innvated

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.