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

By David A. Ucko (Auth.)

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1 meter) for its length, height, and width, its volume is 1 d m x 1 d m x 1 d m , or 1 d m , called o n e cubic decimeter (equal to 1 0 ~ m ) . 6 VOLUME FIGURE 2-5 A cubic meter. The volume of this cube is 1 m x / m x / m = 1 m. 3 its symbol is L o r 1. T h e liter is a c o m m o n l y used unit in chemistry. 06 q t . 3 B e c a u s e 1 decimeter equals 10 c e n t i m e t e r s , w e c a n think of t h e cubic d e c i m e t e r o r liter a s a b o x having t h e d i m e n s i o n s 10 c m x 10 c m x 10 c m (see Figure 2-6).

37 is r o u n d e d to $89. 9 ROUNDING-OFF NUMBERS highest dollar if its cents are 50 or m o r e . 57 b e c o m e s $90. Rounding-off is particularly important w h e n using a calculator. A s shown in Figure 2-10, most calculators display an a n s w e r with eight digits. In nearly every c a s e , not all of t h e s e digits are significant and the a n s w e r must therefore b e rounded-off. ) In general, the value of t h e last digit that is kept, such as dollars in t h e income tax e x a m p l e , d e p e n d s on t h e value of the digit j u s t to its right, which is d r o p p e d .

48 Which contains more liquid: a quart of milk or a liter of milk? 7) 49 What is energy? How is it related to matter? 50 Give one example of a kinetic energy and those given in the book). b potential energy (other than 51 What is internal energy? 52 What does it mean to say that energy is conserved? 53 How are kinetic and potential energy related? 8) 54 Why is it important to be able to recognize significant figures? 790 g. To how many significant figures is this mass expressed? 1 x 10" d m 2 57 Express the number 1500 with b two significant figures.

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