化学：中心科学 英文版 原书第10版 教学课件 作者 美 厄巴那 BROWMN02_A35 A42PR.pdfVIP

BROWMN02_A35-A42PR 1/17/05 16:34 Page A-35 Answers to “Give It Some Thought” Questions Chapter 1 most common oxyanions have the -ate ending. An -ite ending also indicates an oxyanion, but one having less O than the page 3 (a) about 100 elements, (b) atoms and molecules. anion whose name ends in -ate. page 6 oxygen, O page 63 (bottom) BO33- and SiO4 4- . The borate has three O page 8 The water molecule contains the atoms of two different atoms, like the other oxyanions of the second period in elements. Figure 2.27, and its charge is 3 - , following the trend of in- page 11 (a) is a chemical change because a new substance is creasing negative charge as you move to the left in the peri- being formed. (b) is a physical change because the water od. The silicate has four O atoms, as do the other oxyanions merely changes its physical state and not its composition. in the third period in Figure 2.27, and its charge is 4 - , also - 12 following the trend of increasing charge moving to the left. page 15 1 pg, which equals 10 g. page 21 (b) is inexact because it is a measured quantity. Both (a) Chapter 3 and (c) are exact; (a) involves counting, and (c) is a defined value.