CHEM 1151 GENERAL CHEMISTRY BILIN PAULA TSAI

CHEMISTRY THE CENTRAL SCIENCE –Explains all aspects of daily life A QUALITATIVE SCIENCE –Make and record observations A QUANTITATIVE SCIENCE –How much, how many?

CHEMISTRY AN EXPERIMENTAL SCIENCE –Observe and test; laboratory requirement INTELLECTUAL PURSUIT –Scientific method (observe, hypothesize, test, theorize, predict, retest and refine, develop law) METHOD OF INQUIRY –To probe the world around us and to enable advances in our quality of life

CHEMISTRY APPLIED TO ALL ASPECTS OF LIFE Health care including diagnostics, medicine and prevention Materials for buildings, clothing, roads Transportation fuel Agriculture and food Communication, electronics and computers

CHEMISTRY Study of Matter –Matter is characterized by mass and volume –Matter has physical and chemical properties –There are three states of matter: Gas, Liquid, SolidAgriculture and food Study of how matter changes: Chemical Reactions

CHEMISTRY Physical properties –Color, boiling point, freezing point, solubility, density, hardness, conductivity, odor Physical changes –Change in form of matter without changing its chemical identity. E.g. boiling

CHEMISTRY Chemical properties –Reactivity, change in composition, rearrangement of atoms to give new chemical species –Chemical changes (Reactions)

QUANTITATIVE SCIENCE: NUMBER and UNIT How good or precise is the number? –Significant Figures (all certain + one uncertain digit; pp ) –Rules for addition/subtraction and multiplication/division (p ) –Rules for Rounding (p.21-22) Does is make sense? (Ballpark Check) –Develop sense of order of magnitude How can it be expressed? –Scientific Notation (Appen. A)

Units Fundamental SI Units (Table 1.3) Derived SI Units –prefixes (Table 1.4) –combining SI units; I.e. volume (length cubed), density (mass/volume) ( Table 1.5) Dimensional Analysis or Unit Factor Method (conversion to other units) –SI and English(Back End Page)