CHEM 1210 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Stoichiometry, Roman Numerals

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Energy: the capacity to do work (e=fd) or transfer heat. Potential- stored energy within matter due to position, condition, composition. Microscopic-ca(cid:374)"t see (cid:449)ith (cid:374)aked eye but can see (cid:449)ith (cid:373)icroscope. Atomic- too small to see with microscope, chemical process. Chemical- when molecules change into different molecules and bonds are broken. Iron rusts, souring milk, combustion of gas, flammability. State, density, volume, color, melting/boiling point, solubility, thermal expansivity, electrical conductivity, viscosity, opacity. Extensive- proportional to the quantity of the substance. Percent abundance: % of atoms of a natural sample of the pure element represented by a particular isotope. All metals: co(cid:373)posed of ato(cid:373)ic lattice, (cid:373)ostly (cid:862)close packed(cid:863) Accuracy- how closely measured values agree with the correct value. Precision-how closely measured values agree with each other. Ions- atoms or groups of atoms that posses an electrical charge. Molar mass: mass in grams numerically equal to the atomic weight of the element in amu. Covalent: bonds with 2 nonmetals (named using prefixes)