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

What does x represent in the formula for the compound xcl4?

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)