CHEM 101 Midterm: Chemistry Midterm 1 Study Guide
Document Summary
Studies the properties of matter and energy and how they change. Macrodomain: objects that are large enough to experience with our senses. Symbolic domain: meausurement units we use to describe. Chemical equations are models, and other symbols that represent physical ideas. Law: a statement that summarizes a vast number of experimental observations, and describes or predicts some aspect of the natural world. Theory: a well substantiated, comprehensive, testable explanation of a particular aspect of nature. Nucleus = 10-15; 15 units of magnitude smaller than humans. Instruments have limited precision: the smallest value that can be reproducibly measured. Present measurements to the least certain digit. One digit smaller than the last clearly readable digit. The precision of the graduated cylinder is 0. 1 ml. Only count non-zero digits and any zeroes that are placed after a non-zero digit on either side of the decimal. 12000 = 1. 2000 x 104 is 5 sig figs. 1. 2 x 104 is definitely 2 sig figs.
