CHEM 1073- Midterm Exam Guide - Comprehensive Notes for the exam ( 24 pages long!)

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Atomic symbols - atomic theory & compounds - atomic structure. 118 elements, 98 can be found in nature. Elements: one or 2 letter symbols, match name and symbol to rst 36 on periodic table. A 1g sample of methane is collected from a cow and contains 0. 75g of carbon and 0. 25g of carbon. Fracking = mass of c/mass of h = 12/4 = 3. Cow = mass of c/mass of h = 0. 75/0. 25 = 3. Dalton"s atomic theory (lo 20: explains law of consent composition and others. Elements are composed of tiny, indestructible particles (atoms: all atoms of a given elements are identical (have the same mass) The atoms of a given elements are di erent from those of any other element: atoms of di erent elements combine to form compounds. A given compound always has the same relative numbers and types of atoms. Atoms are not created or destroyed in chemical reactions.