Get Basics for Chemistry PDF

By David A. Ucko (Auth.)

ISBN-10: 0127059601

ISBN-13: 9780127059600

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3 milli 1/1000 times liter unit of volume 1 mL = 10~ L 3 FIGURE 2-6 The relationship between a milliliter and a liter. One liter (dm ) contains 1000 milliliters (cm ). 001) L or 10~ L 3 (One milliliter of liquid fills about one-fifth of a t e a s p o o n . A c u p of coffee h a s a volume of about 200 m L . ) T h u s , 1 L = 1 d m = 1000 c m = 1000 m L . 3 FIGURE 2-7 Volumetric glassware: buret, pipet, graduated cylinder, syringe, volumetric flask (from left to right). Each can hold 50 mL of a liquid.

T h e n u m b e r of significant figures in the a n s w e r d e p e n d s upon t h e n u m b e r of significant figures in t h e given information, not in t h e metric c o n v e r s i o n factor. 018 g of iron each day from her diet. H o w would w e state this requirement in milligrams? According to o u r guidelines for solving p r o b l e m s , t h e first step is t o u n d e r s t a n d t h e problem clearly. 018 g You are given a quantity in grams and must find its value in milligrams. 3 METRIC CONVERSIONS T h e second step is to relate t h e u n k n o w n to t h e given information, to m a k e a connection.

Volume is a m e a s u r e of t h e a m o u n t of space occupied. T h e volume of a rectangular object like t h e b o x shown in Figure 2-5 is found by multiplying its length times its height times its width (volume = length x height x width). If each of t h e s e dimensions is exactly 1 meter, t h e volume of t h e b o x is 1 m x 1 m x 1 m , o r 1 m , namely o n e cubic meter. T h e cubic meter is t h e SI unit of v o l u m e . Since t h e cubic meter is rather large for chemical m e a s u r e m e n t s , smaller units of volume are m o r e c o m m o n l y used.

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Basics for Chemistry by David A. Ucko (Auth.)


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