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

By David A. Ucko (Auth.)

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It is divided into 100 small divisions, called c e n t i m e t e r s , 25 M|||||li|'t|||||M|M||||||ip CHI 1 2 3 4 5 6 7 8 10 9 11 12 13 14 ^I'Jijl'lVlil'fe inch •Ii 1 1 i1 • 1 i Ii 1 2 > Ii i Ii 1 i Ii 1 3 i Ii 1 i 1 i iIi 1 i 1 i 4 1 i Ii I i Ii 5 i1 i I i Ii 1 iIi 1 ( i1 i i Ii 1 i Ii 1 F I G U R E 2-4 Portions of a meter stick and a yard stick (shown actual size). 001 m). 5 cm. each of which is further divided into 10 smaller divisions, called millimeters. 54 c m Units that a r e even smaller than t h e millimeter are sometimes useful.

This step m a y m a k e the next problem easier to handle. 51 T h e following summarizes t h e steps involved in problem solving: 1 Understand. 2 Make connections. 3 Set u p . 4 Solve: estimate, calculate. 5 C h e c k a n d review. Practice is essential t o problem solving. By working out m a n y examples in this step-by-step m a n n e r , y o u will d e v e l o p skill a n d confidence in your ability t o tackle n e w p r o b l e m s . D o n ' t feel discouraged if you have difficulties at first.

O t h e r examples are given in Table 2-11. 916 3 3 The first number being dropped is underlined. 35 + 20. 21 190. 19 46 digit being kept is rounded off to the nearest even digit. ) T h e n u m b e r of digits that remain in the a n s w e r to an arithmetical calculation d e p e n d s on the m e a s u r e d values involved. Certain rules apply to addition and subtraction, and different o n e s apply to multiplication and division. W h e n adding or subtracting m e a s u r e m e n t s , the final a n s w e r can h a v e only as m a n y decimal places as the m e a s u r e m e n t with fewest decimal places.

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