CHEM 1127Q Lecture Notes - Lecture 1: Distillation, Intensive And Extensive Properties

• School: UConn
• Department: Chemistry
• Course: CHEM 1127Q
• Professor: Cady

Document Summary

Matter is neither created nor destroyed in a chemical reaction. Mass of the reactants is the same as the products. There are many different types of matter. Pure substances are either elements or compounds (molecules) Heterogeneous are mixtures of two substances that are easily separated. Homogeneous mixtures that are impossible to separate without hella effort (ie) brass. There are two fundamental properties of matter: chemical properties which accompany chemical change (destroy stuff) 1. a) melting sugar into caramel - there is no bringing it back to sugar: physical properties which change without chemical change. Fresh water = 1. 000g/cm3 , and salt water = 1. 025g/cm3. Separation by physical or chemical properties works well for pure substances and homogeneous mixtures. To separate heterogeneous mixtures filtration is used if one thing is liquid and the other is solid. Extensive vs intensive properties: extensive properties: properties that depend on the amount of matter. Things like mass or volume: intensive properties: properties not dependent on amount.