8.(09湖南)Every evening after dinner, if not____ from work , I will spend some time walking my dog.
A. being tired B. tiring C. tired D. to be tired
7.(09福建) In April, 2009, President Hu inspected the warships in Qingdao, ____the 60th anniversary of the founding of the PLA Navy.
A. marking B. marked C. having marked D. being marked
5.(09北京) ___ twice, the postman refused to deliver our letters unless we chained our dog. A. Being bitten B. Bitten C. Having bitten D. To be bitten (09福建)6. not to miss the flight at 15:20, the manager set out for the airport in a hurry. A. Reminding B. Reminded C. To remind D. Having reminded
3.(09北京) For breakfast he only drinks juice from fresh fruit _____ on his own farm. A. grown B. being grown C. to be grown D. to grow
(09北京)4. All of them try to use the power of the workstation ___ information in a more effective way.
A. presenting B. presented C. being presented D. to present
2.(09全国2 ).It is often ____ that human beings are naturally equipped to speak. A. said B. to say C. saying D. being said
1.(09全国2 ) They use computers to keep the traffic smoothly.
A. being run B. run C. to run D. running
16、(天津市2008年化学中考试题)
.某同学取四份50克的水,分别加入一定质量的KNO3固体配
制成t℃时的溶液,
充分搅拌后过滤去未溶解的固体,将相关数据记录如下:
操作序号 |
1 |
2 |
3 |
4 |
加入KNO3质量/g |
40 |
50 |
60 |
70 |
溶液质量/g |
90 |
100 |
105 |
105 |
(1)试判断从第 步操作开始所配制的溶液是饱和溶液。
(2)根据以上数据,计算t℃时KNO3的饱和溶液中溶质质量分数。
15.(桂林市灌阳县2009届初中毕业班第一次中考模拟考化学试
卷)(7分)
甲.乙.丙三种物质的溶解度曲线如右图所示,据图回答:
(1)50 ℃时,乙物质的溶解度是 g;
(2)30 ℃时,三种物质的溶解度由大到小的顺为 ;
(3)要使饱和的丙溶液变为不饱和,可采取的措施是 ;
(4)40 ℃时, (填“能”或“不能”)配制溶质质量
分数相同的甲和乙的饱和溶液;
(5)50 ℃时,将等质量的甲.乙.丙三种物质的饱和溶液同时降温至10 ℃时,析出晶体最多的是 ,所得溶液中溶质质量分数最小的是 。
14.(天津市2008年化学中考试题)(5分)
如图所示是甲、乙、丙三种物质的溶解度曲线,在20℃时,分别取等质量的三种物质的饱和溶液放入三只烧杯中,然后向溶液中分别加入等质量的相应固体物质,再将温度升高到40℃,结果甲物质全部溶解,丙物质部分溶解,试回答下列问题:
(1)乙物质的溶解情况是 _________________;
(2)依次写出甲、乙、丙三种物质的溶解度曲线的序号:
;(用a、b、c填写)
(3)当温度在20℃~30℃时,三种物质的溶解度由大到小的
顺序是_______________________;(用甲、乙、丙填空)
(4)40℃时,溶液中含水最少的是 物质。
(5)40℃时,甲溶液中溶质质量分数____大于丙溶液中溶质质量分数;(填“一定”或“不一定”)。
13. (天津市2009年化学中考模拟试题)
为检验糖尿病患者尿液中葡萄糖的含量,需要配制320克5%的硫酸铜溶液,配制时需要用到的主要仪器有 要使溶液中的溶质完全转化为沉淀,需要10%的烧碱溶液 克。
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