BIOL 1201 Lecture Notes - Lecture 4: Chemical Formula, Molecular Mass, Vaporization

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Molecular formula: describes the compound but not the structure. Isomers: molecules with the same molecular formula but a different arrangement of atoms. Even just one small difference in arrangement can create a whole new substance. Gram molecular weight: the mass of a substance equal to its molecular weight in grams. 1 mole is the mass of a substance equal to its gram molecular weight. 1 molar solution is a solution containing 1 mole of a substance per 1 liter of solution. Many molecules come apart when placed in water. Nacl na+ & cl- ph: the measure of the hydrogen ion concentration ph = -log[h+] Cohesive (sticks to self, bc it"s polar) & adhesive (sticks to other things bc other things are polar); does not stick to non-polar things. High specific heat: takes a lot of energy to change water temperature bc of hydrogen bonds. High heat of vaporization: takes a lot of energy to change water to a gas.

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