What does the law of conservation of mass state?

mass cannot be created nor destroyed in a chemical reaction

mass can be created but not destroyed in a chemical reaction.

mass can be destroyed but not created during a chemical reaction.

mass can be created and destroyed during a chemical reaction.

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

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

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