问题 填空题

(7分)用下图装置在实验室收集一瓶C02进行性质实验,据图回答问题:

(1)写出图中标号仪器的名称:

A是___________,B是____________。

(2)检查装置气密性的操作和现象是:先用夹子夹住导气管中的橡皮管,再向A中加入水至形成一段水柱,静置,若观察到______________,说明气密性良好。

(3)检验C02是否收集满的操作和现象是:将燃着的木条放在__________,若火焰熄灭,说明已经收集满。

(4)Na、Mg等活泼金属可以在CO2中燃烧。某同学收集到一瓶CO2后,通过实验验证Mg条能够在CO2中燃烧。下列物品中他需要使用的有______。   

①酒精灯 ②铁架台 ③坩埚钳 ④砂纸   ⑤试管夹 ⑥蒸发皿

答案

(1)A:长颈漏斗      B:集气瓶 (2)若观察到 一段时间水柱液面不下降

(3)集气瓶口   (4)①③④

先用夹子夹住导气管中的橡皮管,向长颈漏斗注入水,当锥形瓶内与长颈漏斗内产生液面差时说明锥形瓶内气压大于外界大气压,如果液面不动,则装置气密性良好。二氧化碳验满:将燃着的木条放在集气瓶口,若木条熄灭则已经收集满。镁条在二氧化碳中燃烧的验证:用坩埚钳夹持经砂纸打磨过的镁条,在酒精灯上引燃,然后插入盛有二氧化碳气体的集气瓶中。

完形填空

Read the passage and fill in the blanks with proper words(在短文的空格内填入合适的词,使其内容通顺,每空格限填一词,首字母已给出):(14分)

One Sunday morning, Millie and Amy went to Sunshine Park. They love to chat there. As usual, they sat under the big tree. Suddenly, they heard a whisper from the bushes behind the tree. They turned a   小题1:    but could not see anything. They were frightened.

’Is anybody there?" Millie asked. N  小题2:    answered. They listened very carefully and heard the strange noise again. The two girls were very afraid. They ran away quickly. On their w  小题3:   they met Andy.

’What happened?* Andy asked.

’There’s a ghost in the park. Please help us.’ Millie said.

’R  小题4:  ? Tell me more,’ Andy said.

Millie told Andy everything. Andy went to the park, stood beside the tree and listened

carefully. Then he heard the whisper! He looked behind the tree and heard another whisper. He was not sure the sound came from the bushes. He s  小题5:  carefully.

’Oh! Here it is," Andy said to himself. He found a little cat in the bushes. It was very weak. When it miaowed, it made a sound like a whisper.

Andy put the little cat into a box and went to find Millie and Amy. They were s  小题6:    frightened. Andy opened the box and showed them the ‘ghost’.

’This is the ghost in the park," Andy said, Millie and Amy were surprised—it was a little cat- L  小题7:   that day, they took the little cat to the animal centre. People in the animal centre would take care of it

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