The moleceule 2,5-dibromohex-3-ene contains three stereogenic sites: a double bond that can be cis- or trans- and two chirality centers that can be either (R) or (S). Draw structures for and name all possible stereoisomers of 2,5-dibromohex-3-ene. That means 23 stereoisomers, but there's also the potential for high symmetry or meso stereoisomers, which reduces the total number of possibilities. Put boxes around pairs of enantiomers, and label meso if appropriate

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What does the field of thermodynamics relate to a-changes in nuclear reactions b- changes in energy in systems c changes in molecular structure d changes in atomic properties

Which of the following are in a chemical family a. ca, sc, k b. cu, ag, au c. so, ge, sb