By John E. McMurry, Robert C. Fay
Normal Chemistry: Atoms First, moment variation begins from the construction blocks of chemistry, the atom, permitting the authors to inform a cohesive tale that progresses logically via molecules and compounds to aid scholars intuitively stick to complicated ideas extra logically. This unified thread of principles is helping scholars construct a greater starting place and eventually achieve a deeper knowing of chemical thoughts. scholars can extra simply comprehend the microscopic-to-macroscopic connections among unobservable atoms and the observable habit of subject in way of life, and are introduced instantly into genuine chemistry–instead of being compelled to memorize facts.
Reflecting a real atoms first point of view, the second one version gains skilled atoms-first authors, accommodates suggestions from a panel of atoms-first specialists, and follows historic ideals in educating chemistry thoughts established and actual experimental information first. This method distinguishes this article available in the market established wherein different authors train conception first, via experimental data.
2nd Edition
ISBN-10: 0321809262 • ISBN-13: 9780321809261
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Additional info for General Chemistry: Atoms First (2nd Edition)
Sample text
One further point about significant figures: Certain numbers, such as those obtained when counting objects, are exact and have an effectively infinite number of significant figures. 1. In addition, the power of 10 used in scientific notation is an exact number. That is, the number 103 is exactly 1000, but the number 1 * 103 has one significant figure. 4 Significant Figures How many significant figures does each of the following measurements have? 0015 g. 7801 g. 7791 g? 8 How many significant figures does each of the following quantities have?
184 J. 184 kilojoules (kJ). 184 kJ ᭡ The 75 watt incandescent bulb in this lamp uses energy at the rate of 75 J/s. Only about 5% of that energy appears as light, however; the remaining 95% is given off as heat. The energy value, or caloric content, of food is measured in Calories. Thus, the statement that a banana contains 70 Calories means that 70 Cal (70 kcal, or 290 kJ) of energy is released when the banana is used by the body for fuel. A Big Mac hamburger from McDonald’s contains 540 Calories.
That is, the number 103 is exactly 1000, but the number 1 * 103 has one significant figure. 4 Significant Figures How many significant figures does each of the following measurements have? 0015 g. 7801 g. 7791 g? 8 How many significant figures does each of the following quantities have? Explain your answers. 9 Characterize each of the following dartboards according to the accuracy and precision of the results. 10 ROUNDING NUMBERS It often happens when dealing with measurements, particularly when doing arithmetic on a calculator, that a quantity appears to have more significant figures than are really justified.