题目

1. She ___________ (自愿) her services for relief work. 2. His services to the country were never officially ___________ (承认). 3. Fresh air is ______________ (有益的) to one’s health. 4. I ___________(同意) of your trying to earn some money. 5. During one’s _____________ (青春期), one can easily be nervous. 6. I’ve made a few minor ______________(调整) to the seating plan. 7. As a young man, he worked as a ___________ (店主) in town. 8. She can look back on her career with great ____________(满意). 9. She’s ________ (挨饿)herself to try to lose weight. 2、固体的溶解度（1）溶解度的定义：在 一定温度下，某固态物质在 100g溶剂里达到 饱和状态时所溶解的 溶质的质量．四要素：①条件：一定温度；②标准：100g溶剂；③状态：达到饱和；④质量：溶解度的单位：克．（2）溶解度的含义：20℃时NaCl的溶解度为36g，含义：在20℃时，在100克水中 最多能溶解36克NaCl或在20℃时，NaCl在100克水中达到 饱和状态时所溶解的质量为36克．（3）影响固体溶解度的因素：①溶质、溶剂的性质（种类）；   ②温度；大多数固体物质的溶解度随 温度的升高而增大；如KNO3少数固体物质的溶解度 受温度的影响不大；如NaCl极少数物质的溶解度随 温度的升高而降低．如Ca（OH）2