ENVS 010 Lecture Notes - Lecture 1: Relative Atomic Mass, Chemical Bond, Atomic Number

• School: SJSU
• Department: Environmental Studies, Department of
• Course: ENVS 010
• Professor: Rachel Lazzeri-Aerts

Document Summary

Atoms bond to each other = molecules. Elements - substances cannot be broken down into other substances by chemical reaction. Compounds - 2 or more elements in a fixed ratio. During chemical reactions, atoms are a whole, swap as molecules build up or break down. Living organism composed of matter, matter composed of elements. Atoms composed of protons, neutrons, and electrons. # of protons determine the element, # of neutrons determines the isotope, # of electrons determines the ion state & chemical activ. During chemical reaction, atoms gain, release & share electrons with other atoms. Atoms attract & held by chemical bond. Molecule of water contains 2 polar covalent bonds. (polar covalent bonds + hydro bonds hold atoms together within a molecule of water) Chemical bonds = ionic (transfer electrons) / covalent (shares electrons) Covalent bonds = nonpolar (equal share) / polar (unequal share) Hydrogen bonds = important structure of water.