题干

通过近一年的化学学习,你已经掌握了实验室制取气体的有关方法.请根据图回答问题:

(1)仪器①的名称是 ____,利用A装置可制取的气体有H2、O2和 ____

(2)B装置在化学实验中有广泛的用途.

①用排水法收集氢气,可在B装置中装满水后,使氢气从 ____口进入(填“a”或“b”).

②若要得到干燥的氢气,可在B装置中加入 ____,气体应从口进入 ____(填“a”或“b”).

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答案(点此获取答案解析)

锥形瓶,二氧化碳,a,浓硫酸,b

同类题2

根据短文理解,选择正确答案。

    In 1978, I was 18 and was working as a nurse in a small town about 270 km away from Sydney, Australia. I was looking forward to having five fays off from duty. Unfortunately, the only one train a day back to my home in Sydney had already left. So I thought I'd hitch a ride (搭便车).

    I waited by the side of the highway for three hours but no one stopped for me. Finally, a man walked over and introduced himself as Gordon. He said that although he couldn't give me a lift, I should come back to his house for lunch. He noticed me standing for hours in the November heat and thought I must be hungry. I was doubtful as a young girl but he assured (使…放心)me I was safe, and he also offered to help me find a lift home afterwards. When we arrived at his house, he made us sandwiches. After lunch, he helped me find a lift home.

    Twenty-five years later, in 2003, while I was driving to a nearby town one day, I saw an elderly man standing in the glaring heat, trying to hitch a ride. I thought it was another chance to repay someone for the kindness I'd been given decades earlier. I pulled over and picked him up. I made him comfortable on the back seat and offered him some water.

    After a few moments of small talk, the man said to me, “You haven't changed a bit, even your red hair is still the same.” I couldn't remember where I'd met him. He then told me he was the man who had given me lunch and helped me find a lift all those years ago. It was Gordon.