题干

冬天使用的热敷袋里面有铁粉、氯化钠、碳粉,利用铁被氧化放出的热量取暖.某同学拆开一袋后取里面的固体粉末进行实验:

①将粉末投入盛有足量稀盐酸的烧杯中,观察到有大量气泡产生,底部有黑色粉末.则发生反应的离子方程式为____

②为分离出反应后的溶液,可将上述烧杯中混合物进行____操作,该操作需要的玻璃仪器为____

③在②得到的溶液中通入氯气,发生如下离子反应:2Fe2++Cl2=2Fe3++2Cl-;在该离子方程式中,当有ag氧化产物生成时,需通入标准状况下的氯气体积为____L(用含a的代数式表示).

④该同学将少量铜片投入制得的含FeCl3的溶液中,发现铜片慢慢溶解消失,溶液由黄色变为青绿色.则发生反应的离子方程式为____

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答案(点此获取答案解析)

Fe+2H+=Fe2++H2↑,过滤,烧杯、玻璃棒和漏斗,0.2a,2Fe3++Cu=Cu2++2Fe2+

同类题5

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    I'm a 20-year-old boy,and the following is my story.

    A month after I graduated from high school in August,2007,I was coming home from swim practice in the training centre of the city and was involved in a car accident.I was so seriously injured that I was in a coma for more than two months at Prince Georges Hospital.

    I suffered a lot from the experience of dying eight times during my coma and I couldn't open my mouth to talk or to communicate when I eventually came around.At that time,it seemed that walking was never going to happen again due to all the extreme injuries.Just like my body,my dreams were completely destroyed.But I was not going to let my injuries stop me from realizing my dreams.

    After receiving a total of 15 operations and 36 blood transfusions,I had to make every great effort to learn to talk,eat,walk,shower,and live on my own again.When I was out of hospital,I still had to Go to outpatient therapy in Waldorf,Maryland.After I spent a few months in a wheelchair,I took baby steps to walk on my own.It was a miracle that I was able to walk again,but I still wanted to prove that I could not only walk,but also run.When it came true,I wanted to get back into the pool again.After having a few lung tests,I was able to go in the pool a little bit each week. After a few months of swim training,I began my freshman year at St.Mary's College of Maryland and then became a proud member of the swim team.

    By telling my story,I want to make a positive influence on the world.I am just trying to live every day to the fullest and inspire other people never to give up their dreams no matter how bad a situation is to them.I remember when I was still in my hospital bed,I would have my mom and dad push me round in my wheelchair to the other rooms to see the other patients and chat with them and their family members.I wanted to let them know that everything was going to be okay.Somehow,things would work out for the best.