Measurement and Significant Figures AP CHEMISTRY. Textbook: Chemistry by Zumdahl & Zumdahl, 9th edition, Instructor: Mrs.
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1 AP CHEMISTRY Textbook: Chemistry by Zumdahl & Zumdahl, 9th edition, Instructor: Mrs. Beth Smith Ch 1 Chemical Foundations Big Idea 1: The chemical elements are fundamental building materials of matter and all matter can be understood in terms of arrangements of atoms. These atoms retain their identity in chemical reactions. I CAN: Perform calculations involving significant figures. Identify the characteristics of the states of matter: solids, liquids and gases. Name compounds and write formulas for binary and ternary compounds and acids. Ch. 1 Chemical Foundations Topics: Scientific Method, Measurement, Significant Figures, Dimensional Analysis, Classification of Matter Measurement and Significant Figures initio.com 1
2 Steps in the Scientific Method 1. Observations - quantitative - qualitative 2. Formulating hypotheses - possible explanation for the observation 3. Performing experiments - gathering new information to decide whether the hypothesis is valid Outcomes Over the Long-Term Theory (Model) - A set of tested hypotheses that give an overall explanation of some natural phenomenon. Natural Law - The same observation applies to many different systems Law vs. Theory A law summarizes what happens A theory (model) is an attempt to explain why it happens. Einstein's theory of gravity describes gravitational forces in terms of the curvature of spacetime caused by the presence of mass Nature of Measurement A measurement is a quantitative observation consisting of 2 parts: Part 1 - number Part 2 - scale (unit) Examples: 20 grams 6.63 x Joule. sec 2
3 The Fundamental SI Units (le Système International, SI) SI Units Celsius & Kelvin SI Prefixes Common to Chemistry 3
4 Uncertainty in Measurement A digit that must be estimated is called uncertain. A measurement always has some degree of uncertainty. Measurements are performed with instruments No instrument can read to an infinite number of decimal places Precision and Accuracy Accuracy refers to the agreement of a particular value with the true value. Precision refers to the degree of agreement among several measurements made in the same manner. Neither accurate nor precise Precise but not accurate Precise AND accurate Types of Error Random Error (Indeterminate Error) - measurement has an equal probability of being high or low. Systematic Error (Determinate Error) - Occurs in the same direction each time (high or low), often resulting from poor technique or incorrect calibration. This can result in measurements that are precise, but not accurate. Nonzero integers always count as significant figures has 4 sig figs. 4
5 Zeros - Leading zeros do not count as significant figures has 3 sig figs. Zeros -Captive zeros always count as significant figures has 4 sig figs. Zeros Trailing zeros are significant only if the number contains a decimal point has 4 sig figs. Exact numbers have an infinite number of significant figures. 1 inch = 2.54 cm, exactly 5
6 Sig Fig Practice #1 How many significant figures in each of the following? m kg 100,890 L 3.29 x 10 3 s cm 3,200,000 Rules for Significant Figures in Mathematical Operations Multiplication and Division: # sig figs in the result equals the number in the least precise measurement used in the calculation x 2.0 = (2 sig figs) Sig Fig Practice #2 Calculation Calculator says: Answer 3.24 m x 7.0 m m g 23.7 cm g/cm cm x cm cm m 3.0 s m/s lb x 3.23 ft lb ft g 2.87 ml g/ml Rules for Significant Figures in Mathematical Operations Addition and Subtraction: The number of decimal places in the result equals the number of decimal places in the least precise measurement = (3 sig figs) 6
7 Sig Fig Practice #3 Calculation Calculator says: Answer 3.24 m m m g g g 0.02 cm cm cm L L L lb lb lb ml ml 0.16 ml 7
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