CHE 129 Study Guide - Final Guide: Sodium Hydroxide, Magnesium Hydroxide, Sodium Chlorite

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 129
• Professor: Carlos Simmerling

Document Summary

Formed between a metal and a non-metal; electrons are transferred. Require a lot of energy to break bonds. Requires not much energy to break bonds. Lists the elements involved, with integer numbers that tell you their relative amounts. Subscripts are the simplest ratio of atoms present. Ex: the empirical formula of c2h4 is ch2. The subscripts tell you exactly how many atoms of each element are in a single molecule. Describes compounds by mass percent of elements present. Ratio of masses is not the same as ratio of atoms. Ex: what is the mass percent of sodium in sodium chlorite (naclo2) %na=(cid:2923)a(cid:2929)(cid:2929) (cid:2925)(cid:2916) (cid:2929)(cid:2925)(cid:2914)(cid:2919)(cid:2931)(cid:2923) (cid:2923)a(cid:2929)(cid:2929) (cid:2925)(cid:2916) (cid:2898)ac(cid:2922)(cid:2899)2 x 100. Assume there is 100g of the sample. Use the molar masses to convert the grams of each element to moles. Divide the smallest number of moles of an element into the moles of each element present.