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By Ralph Petrucci,Jeffry D. Madura,Geoff Herring,Carey Bissonnette
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Chemical compounds are substances comprising atoms of two or more elements joined together. Scientists have identified millions of different chemical compounds. In some cases, we can isolate a molecule of a compound. A molecule is the smallest entity having the same proportions of the constituent atoms as does the compound as a whole. A molecule of water consists of three atoms: two hydrogen atoms joined to a single oxygen atom. A molecule of hydrogen peroxide has two hydrogen atoms and two oxygen atoms; the two oxygen atoms are joined together and one hydrogen atom is attached to each oxygen atom.
37 in.? Explain. 48 * 104. 5. *C. J. Guare, J. Chem. , 68, 818 (1991). As added practice in working with significant figures, review the calculations in Section 1-6. You will note that they conform to the significant figure rules presented here. Some people prefer the round 5 to even rule. 6. In banking and with large data sets, rounding needs to be unbiased. With a small number of data, this is less important. 22 Chapter 1 EXAMPLE 1-5 Matter: Its Properties and Measurement Applying Significant Figure Rules: Multiplication/Division Express the result of the following calculation with the correct number of significant figures.
54 cm)? To solve this problem, we begin by relating the volume of a cube to its length, that is, V = l3. Then we can map out the conversion pathway: in. osmium ¡ cm osmium ¡ cm3 osmium ¡ g osmium (converts in. 54 cm 1 in. 5 g>mL. 000 kg of mercury at 25 °C. 5 g>mL (at 25 °C); (2) noting what we are trying to determine a volume in milliliters (which we designate mL mercury); and (3) looking for the relevant conversion factors. Outlining the conversion pathway will help us find these conversion factors: kg mercury ¡ g mercury ¡ mL mercury We need the factor 1000 g>kg to convert from kilograms to grams.