2.3 The student found that only 0.4 mol of copper oxide was available to react with the doubled quantity of sulfuric acid in question 2.2.
Explain the effect this would have on the amount of product obtained.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.