CHEM 121 Chapter Notes - Chapter 0 textbook and lecture: Dimensional Analysis, Scientific Notation, Significant Figures
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Matter~ anything with a physical presence (touch, taste, smell); anything with mass. Weight~ measure of the force gravity exerts on an object. Weight is dependent on location (you weigh less on the moon but your mass is the same) Temp in k = temp in c + 273. 15. Temp in c = temp in k - 273. 15. F= 9 f x c + 32 f. 0. 6 measuring volume: volume~ amount of space occupied by an object. 0. 7 density: density = mass (g)____ volume (ml or cm3, volume= mass density. 0. 8 energy: joule~ (kg x m2) s2. 0. 9 accuracy, precision, and significant figures: accuracy~ how close a measured value is to the true value. Accurate if measurement is close to true value: precision~ how well a number of independent measurements agree with one another; degree of reproducibility. Precise if multiple measurements vary little from each other: sig figs. All non zero digits are significant (1, 2, 3 )
