CHE 131 Lecture Notes - Lecture 4: Acid Salt, Chemical Reaction, Noble Gas

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 131
• Professor: Benjamin Hsaio, Jiangyong Jia, Roy Lacey

Document Summary

Have a unique and defined chemical structure. Fixed ratio of atoms that are held together in a defined shape. Use chemical formulas to express the identities and quantities of substances involved in reaction. Same element in different ratio form different compounds. If 2 elements combine to form more than one compounds, the masses of one element (a) that combine with a fixed mass of (b) are in the ratio of small whole numbers (or multiples) # of electrons transferred is based on what group the element is in. Na lose 1 electron ba lose 2 electrons cl gain 1 electron s gain 2 electrons. Molecular compounds are composed of atoms held together by covalent bonds. Attraction / sharing electron between two positively/negatively charged nuclei. Attraction between positive ions and surrounding freely mobile electron. most metals contribute more than one mobile electron per atom. Bc ionic bonding can break off by force.