Which of the following is accurate about the octet rule? You MUST explain your reasoning for answer Most of the time, nonmetals will form four covalent bonds in order to achieve a stable octet.
Fluorine, nitrogen, and oxygen can form more or less than four bonds and still satisfy the octet rule.

Which compound contain an iron with a 3+ charge

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.)

Can someone me with 3 and 4 plz. this is for masteries test.