CH1 notes

# CH1 notes - better represented with exponential...

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Chapter 1 Chemistry: The Study of Change Definitions Significant Figures Dimensional Analysis Classification of Matter HW #P1 Quiz #1 will cover HW #P1

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Chapter 1 Matter and Measurement I. Definitions, History and other B.S. A. What is Chemistry 1. Synthesis of New Materials 2. Control Changes of Matter 3. Identity and Concentration of Substances Chemistry is the study of matter.
B. Historical Perspectives 1. Crafts 2. Philosophy B Nature of Matter 3. Scientific Method

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II. Significant Figures B Uncertainty in Measurement A. Rules for Numbers 1. All nonzero digits are significant 457 0.25 2. Zeros between nonzero digits are significant 1005 1.03 3. Zeros to left of 1st nonzero digit are not significant 0.02 0.0026 4. Zeros at the end of a number to the right of a decimal are significant 0.02000 3.0 5. Zeros at the end of a number without a decimal B ? 11,600 could have 3, 4 or 5

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Unformatted text preview: better represented with exponential notation (Appendix A1 in text) 1.16 h 10 4 1.160 h 10 4 1.1600 h 10 4 B. Rules for Calculations 1. In addition or subtraction one reports the result to the same number of decimal places as the term with the fewest decimal places. 2. In multiplication and division one reports the result with no more significant figures than the measurement with the fewest significant figures. III. Dimensional Analysis B Unit Conversion number h 1 = number 6 h 1 = 6 Examples: 1. I weigh 180 lb, how many kilograms? 2. A sign says 40 km/h, how many miles/h? 3. What is the volume in cm 3 of a block that is 2.0" h 3.0" h 4.0"? For dimensional analysis the units must be correct and carefully checked. IV. Classification of Matter Gas, Liquid, Solid...
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