CHEM 1122 Lecture Notes - Lecture 4: Silly Putty, Amorphous Solid, Crystal
Document Summary
What is matter, anything that occupies space and has mass, ultimately composed of atoms. Atoms bond to form molecules: molecules have specific arrangement of atoms, classifying, into 3 categories, solid wood, metal, humans, ice, have structure but are stuck in place, crystalline solid gemstone, plastic, amorphous solid (changes structure/shape) Glass, plastic, silly putty: not compressible, have fixed volume and fixed shape, liquid water, gasoline, vegetable oil. Take shape of container: not compressible, have fixed volume, and have variable-fixed shape, gas steam, co2, he, o2, cl2, no fixed shape but take shape of container. Are compressible but have no fixed volume: no fixed volume = molecules disperse in random motion to get away from gas molecules, pure vs. impure mixture. Pure-systems made of only one thing: ex) nacl (table salt, mixture is comprised of multiple things, ex) nacl and kcl (sea salt) 2 types of mixtures: homogeneous = same throughout. = 2 liquids that are miscible (mixable: heterogeneous = different throughout.
