问题
选择题
将稀盐酸慢慢滴入装有氢氧化钠溶液的烧杯中,用温度计测出烧杯中溶液的温度,溶液温度随加入稀盐酸质量增加而发生变化,如下图所示。有关叙述中错误的是
[ ]A.b点表示氢氧化钠和盐酸恰好完全反应
B.恰好完全反应时所得溶液中溶质只有NaCl
C.从a到b过程中,烧杯中溶液的pH逐渐增大
D.稀盐酸与氢氧化钠溶液发生的反应是放热反应
答案
答案:C
将稀盐酸慢慢滴入装有氢氧化钠溶液的烧杯中,用温度计测出烧杯中溶液的温度,溶液温度随加入稀盐酸质量增加而发生变化,如下图所示。有关叙述中错误的是
[ ]A.b点表示氢氧化钠和盐酸恰好完全反应
B.恰好完全反应时所得溶液中溶质只有NaCl
C.从a到b过程中,烧杯中溶液的pH逐渐增大
D.稀盐酸与氢氧化钠溶液发生的反应是放热反应
答案:C
阅读理解。 | ||||||
| ||||||
1. The three passages above are most probably taken from. | ||||||
A. Newspapers B. Novels C. Diaries D. Books | ||||||
2. What does the underlined part mean? | ||||||
A. 拾起 B. 恢复 C. 顺便学到 D. 摘取 | ||||||
3. What can be the best title for the second passage? | ||||||
A. Two pushed-away students. B. The most beautiful teacher in China. C. The most beautiful bride (新娘). D. A Chinese language teacher. | ||||||
4. How many preschoolers were killed in the accident? | ||||||
A.64. B.21. C.19. D.43. | ||||||
5. Which is Not mentioned in the passage? | ||||||
A. Zhang Lili comes from Heilongjiang province. B. Liu Xiang joined in the National Games when he was 18. C. The school bus accident happened in Gansu province. D. More yellow school buses will be seen on the road in China. |