问题 问答题

写出下列物质在溶液中的电离方程式.

(1)硫酸铁:(2)碳酸钠:

答案

(1)硫酸铁电离后生成铁离子和硫酸根离子,故答案为:Fe2(SO43=2Fe3++3SO42-

(2)碳酸钠电离后生成钠离子和碳酸根离子,故答案为:Na2CO3=2Na++CO32-

写作题

书面表达。

        假如你是Kevin,正和朋友们在北京旅游.请给你父母写一封电子邮件,告诉他们你在北京旅游的情况.

要求:语句通顺、前后连贯,60词左右.邮件的开头已给出,不计入总词数.

From : kevin@ 163 . com                        

To : asost@ sina. com

Subject : Trip                                          

Date : May 5 ,2010  

Dear Mom and Dad,                                                              

     I am writing this e-mail to tell you my trip to Beijing.

_________________________________________________

_________________________________________________                                                                                              

                                                                                                                                 Love,                                                                        

                                                                                                                                Kevin  

问答题 简答题