问题 问答题

氯气(Cl2)通常情况下为有强烈刺激性气味的黄绿色的气体,具有强氧化性,一定条件下可与除Pt、Au外大部分金属反应。氢气在氯气中能安静地燃烧,发出苍白色火焰,而红热的铜丝在氯气里剧烈燃烧,冒出大量的棕黄色的烟。请根据资料回答下列问题:

(1)根据上述资料提供的信息,你对燃烧有什么新的认识?__________________________。

(2)氯气的活动性比氧气的活动性_________(填“强”或“弱”)。

(3)与金属相似,活泼的非金属也能置换不活泼的非金属。已知以下两个反应都能发生:①Cl2+2NaBr=Br2+2NaCl; ②Br2+2NaI=I2+2NaBr。则Cl2、Br2、I2三种单质的活动性由弱到强的顺序为_________________,请完成氯气与碘化钾(KI)溶液反应的化学方程式_______________________________________。

答案

:(1)一般情况下,氧气有助燃性,可以支持燃烧,而该题中显示氢气在氯气中也可以燃烧,所以启示为:物质不一定只在氧气中才能燃烧.

故答案为:物质燃烧不一定需要氧气;

(2)红热的铜丝在氯气里剧烈燃烧,而氧气不能,所以氯气的活动性比氧气的活动性强.

故答案为:强;

(3)因为活泼的非金属也能置换不活泼的非金属,以及①Cl2+2NaBr=Br2+2NaCl; ②Br2+2NaI=I2+2NaBr.可知Cl2、Br2、I2三种单质的活动性由弱到强的顺序为:I2、Br2、Cl2;根据三者的活动性顺序可知,氯可以置换出化合物中的碘,故氯气与碘化钾(KI)溶液反应的化学方程式是:Cl2+2Kl═I2+2KCl.

故答案为:I2、Br2、Cl2;Cl2+2Kl═I2+2KCl.

解答题
阅读理解

In my opinion, there is only one legitimate (合法的) handgun sport and that is aim practice. It is practiced at objects which are properly monitored and usually quite safe. Only certain handguns are true “sporting weapons”, seen as such by the sport’s lovers.

On the other hand, shooting at tin cans and other small objects in one’s backyard is not and should not be considered a serious sport. When uncontrolled, it can be a very dangerous practice.

Some opponents (反对者) of handgun control have stated that we are out to stop all hunting and that controlling the handgun would severely affect hunting. That is simply untrue. Handgun control would in no way limit the freedom of the true hunter. Few if any hunters consider the handgun an effective hunting weapon.

There are a few hunters who do hunt with handguns, but most states place restrictions (限制) on the type of guns that can be used in hunting, the reason is that killing of game should be done in as humane (人道的) a way as possible. Some small handguns are more likely to wound the animal rather than kill it at once. Only long guns, rifles and shotguns are effective arms of hunting.

People must understand that handguns and hunters are separate matters. Because most of the hunters use a rifle or shotgun, there is no reason why their search for game and sport should be affected by handgun control. Mixing the anti-hunting matter with the handgun matter confuses the killing of animals with killing of people.

小题1:In the writer’s opinion, people should use handguns only when           .

A.hunters shoot at animals

B.they aim at a criminal

C.objects are under control

D.objects are only small tin cans in the backyard小题2:According to the writer, hunting is not affected by handgun control because         .

A.hunters can use knives rather than guns to hunt animals

B.state government encourages hunters to use other guns

C.nobody cares what weapons are used to kill animals

D.most hunters use rifles rather than handguns小题3:This passage mainly talks about           .

A.the relation between hunting and handgun control

B.the importance of aim practice

C.how handgun control affects hunting

D.different types of guns used in hunting