CHEM 111 Lecture Notes - Decane, Sodium Chloride, Ethylene Glycol
Document Summary
Only pencil, calculator, and id at your desk. So, no sunglasses, hats, water bottles, backpacks, etc. Starting every hour from 9 am to 3 pm. Mixtures groups of substances that are physically intermingled, can be separated by physical means, can vary in composition. Compounds type of matter composed of elements that are chemically bonded together, cannot be separated by physical means, do not vary in composition. Give information about the identity and number of atoms in a compound. Empirical formula gives the relative number of atoms, such as the ionic formula unit. Empirical formula for hydrogen peroxide ho, showing a one-to-one ratio of atoms. Molecular formula gives the actual number of atoms in a molecule, excludes ionic compounds. Mass of compounds given in terms of formula units or molecules. Formula / molecular mass = of all atomic masses in the formula unit or molecule.
