CHEM 205 Lecture Notes - Lecture 4: Relative Atomic Mass, Pencil, Chemical Formula

• School: Concordia University
• Department: Chemistry
• Course: CHEM 205
• Professor: Cerrie Rogers

Document Summary

Molecules, compounds and molar mass: molar mass (mm or m)= mass (g) of one mole of substance. Located inside red blood cells: hemoglobin= the protein that carries oxygen in the blood, requires fe to function properly, fe defi(cid:272)ie(cid:374)(cid:272)(cid:455): fatigue, i(cid:374)fe(cid:272)tio(cid:374)s, (cid:373)outh i(cid:374)fla(cid:373)(cid:373)atio(cid:374) . Goal: find mole ratio of elements present: determine mass of each element in your sample. If given mass % data, but no sample mass: use 100g. When the anhydrous salt is removed from the over, its mass is 1. 883g. 3. 1 reactions obey law of conservation of mass. Joh(cid:374) dalto(cid:374): (cid:862)che(cid:373)i(cid:272)al (cid:272)ha(cid:374)ge i(cid:374)(cid:448)ol(cid:448)es a (cid:396)eo(cid:396)ga(cid:374)izatio(cid:374) of the ato(cid:373)s i(cid:374) o(cid:374)e o(cid:396) (cid:373)o(cid:396)e su(cid:271)sta(cid:374)(cid:272)es. (cid:863: a(cid:374)toi(cid:374)e la(cid:448)oisie(cid:396): (cid:862)matte(cid:396) (cid:272)a(cid:374) (cid:374)eithe(cid:396) (cid:271)e (cid:272)(cid:396)eated (cid:374)o(cid:396) dest(cid:396)o(cid:455)ed. (cid:863) Law of conservation of matter: applies during chemical reactions: total # atoms of each element is the same in reactants and products, t(cid:449)o sides of (cid:272)he(cid:373)i(cid:272)al e(cid:395)uatio(cid:374)s a(cid:396)e (cid:862)(cid:271)ala(cid:374)(cid:272)ed(cid:863) ato(cid:373)-by-atom. 3. 2 balancing chemical equations: symbolic representation of a chemical reaction: