题干

以下是实验室中常用的部分仪器.

(1)仪器⑤的名称为____ 

(2)若用高锰酸钾制取氧气,除上述部分仪器外,还需增添的仪器是____(填仪器名称);若制取3.2g氧气,理论上至少需要高锰酸钾 ____  g.

(3)某同学要用大理石和稀盐酸混合制取并收集CO2,选用并组装如图1装置,造成的后果是____

上一题 下一题 0.0难度 选择题 更新时间:2019-05-23 11:39:56

答案(点此获取答案解析)

酒精灯,试管,31.6,产生的二氧化碳气体会由长颈漏斗逸出

同类题4

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Do you still remember the haze(雾霾)in the winter? So many people got terribly ill during or after the haze. ____Here is advice for you to protect yourself in hazy weather.

    Spend less time outdoors.This is the most effective way for self-protection in such bad weather.With PM2.5 increasing 103mg per cubic meter,residents will risk a 2.29% increase of death,which experts found out in 2012.If you have to get out,avoid riding bicycles.____

    Close your windows.Experts advice residents to avoid opening windows at home.If you have to ,avoid the time when smog is at its densest(浓的).____Besides,you can keep plants with broad leaves at home to absorb dust,and use air purifiers(清洁器).

    Smoke less.____In hazy weather,smoking would be even more harmful.Smokers are advised to keep their distance from cigarettes before the weather gets better.

    ____For example ,wear special masks outside to avoid breathing in PM2.5.Then take off your coat after getting indoors and keep it away from your other clean clothes,Don't forget to wash your face,rinse(漱)your mouth,and clean your nasal cavity(鼻腔)to clean the particulate matters(颗粒物)that fall on you.Last but not least,keep off stimulating(刺激性)foods.

A.Wear masks.

B.Pay attention to other daily things.

C.Also avoid rush hours,when pollutants will be denser.

D.That's because haze does harm to the health of people.

E.Cigarettes could cause more particulate matters,which are included in PM2.5 .

F.Take more fruits and vegetables instead,which are good for lung,spleen(脾)and kidney(肾).

G.For residents who use air-conditioner,make sure your apartment has enough oxygen indoors.