CHEM 111 Lecture Notes - Lecture 16: Core Electron, Lattice Energy, Molecular Machine

• School: BYU
• Department: Chemistry and Biochemistry
• Course: CHEM 111
• Professor: David Dearden

Document Summary

Exam 1 starting tomorrow don"t forget to take it at the testing center be sure you have all pages! review tomorrow. All alkali metals react with water to form hydrogen gas. Ionization energy is lowered going down the column, makes it easier to remove electrons. Gets denser going down because individual atoms are becoming heavier going down. 2 atoms that form a bond have (the biologists" heresy!) breaking bonds always costs energy correct answer - less energy than when they were separate. Combustion of h2, ch4, c2h6, c4h10 combustion - reaction with anything that involves oxygen, really. Combust hydrogen-hydrogen bonds and creates hydrogen-oxygen bonds - net worth of increased energy. Bond formation involves going to a lower energy. For chemistry, only the valence electrons are important. Certain arrangements of electrons in atoms are especially low energy (stable) Let"s take a closer look at energies in nacl formation.