5.f a.helen kellerb.a c.grace d.c

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已知A、B、C、D、E、F是含有同一种元素的化合物，其中F能使红色湿润石蕊试纸变蓝色，它们之间能发生如下反应：① A+H2O → B+C
② C+F → D
D+NaOH → F+E+H2O （1）写出它们的化学式：D_______________，F_______________。（2）写出①反应的化学方程式：_______________________________（3）写出反应③的离子方程式：___________________________。（4）工业生产C的过程中有如下一步反应：即F经催化氧化生成B和H2O，写出该步反应的化学方程式：________________________________。
（1）NH4NO3
NH3 （2）3NO2 + H2O= 2HNO3+ NO （3）NH4++ OH-NH3 ↑+ H2O （4）4NH3 + 5O2 4NO + 6H2O
试题分析：F能使红色湿润石蕊试纸变蓝色则F为NH3；A、B、C、D、E、F是含有同一种元素的化合物而且有上述关系，则A是NO2，B为NO，C为HNO3，D为NH4NO3，E为NaNO3.（1）化学式：D: NH4NO3; F: NH3;（2）①反应的化学方程式3NO2 + H2O= 2HNO3+ NO;（3）反应③的离子方程式NH4++ OH-NH3 ↑+ H2O.（4）工业生产HNO3过程中NH3经催化氧化生成NO和H2O的反应方程式为4NH3 + 5O2 4NO + 6H2O。
试题“已知A、B、C、D、E、F是含有同一种元素的化合物...”；主要考察你对
等知识点的理解。
句型转换。
1. It"s time for Helen"s English lesson. (同义句转换)
It"s time ______ Helen ______ have English lesson. 2. He wants to have a cup of tea. (同义句转换)
He _____ ______ to have a cup of tea. (同义句转换)3. He is a very good basketball player. (同义句转换)
He does well ______ ______ basketball. 4. He walks to school every day. (对画线部分提问)
_______ does he ______ to school every day? 5. The girl in red is my sister. (对画线部分提问)
______ girl is ______ sister?
重点句型。1. Thanks for the photo of your family.
______________________2. Here is my family photo!
______________________
句型转换。
1. The book was so interesting that I read it the whole night. (改为同义句)
It was ____ book that I read it the whole night. 2. Lily asked, "Where does Jim study?" (改为宾语从句)
Lily asked ____.
3. They got up early to catch the early bus. (改为同义句)
They got up early ____
they could catch the early bus. 4. To know about Chinese fashion cultures is meaningful for us. (改为同义句)
____ meaningful for us ____ about Chinese fashion cultures. 5. People say the modern car was made in America. (改为同义句)
____ the modern car was made in America.
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