What is the percent yield of oxygen in 2KClO —> 2KCl + 3O2

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer