您所在的当前位置：高中化学试题 >

原电池原理

> 某同学利用家中废旧材料制作一个可使玩具扬声器发出声音的电池，装置如图所示。下列说法正确的是 A．碳棒上发生的主要反应为：2H＋＋2e－=H2↑ B．铝质易拉罐将逐渐得到保护 C．电池总反应为：4Al＋3O2＋6H2O==4Al(OH)3 D．电子方向为：铝质易拉罐→导线→扬声器→导线→碳棒→浸透食盐水的布

问题：

发布时间：2024-09-09

某同学利用家中废旧材料制作一个可使玩具扬声器发出声音的电池，装置如图所示。下列说法正确的是

A．碳棒上发生的主要反应为：2H^＋＋2e^－=H₂↑

B．铝质易拉罐将逐渐得到保护

C．电池总反应为：4Al＋3O₂＋6H₂O==4Al(OH)₃

D．电子方向为：铝质易拉罐→导线→扬声器→导线→碳棒→浸透食盐水的布

参考答案：

提问用户：ai***bMK

可能感兴趣的题目：

1 某城市水质硬度较大，容易产生水垢（细小的碳酸钙颗粒），长期使用的毛巾很容易变滑腻，你觉得可以选用厨房中的哪一种物品将水垢除去（　　） A．食盐 B．花生油 C．蔗糖 D．食醋
2 日本福岛第一核电站事故释放出的人工放射性核素碘－131( I)一旦被人体吸入，可能会引发甲状腺疾病。下列说法正确的是 A．I是一种新元素 B．I的摩尔质量为131g C．I核内有78个中子 D．碘元素位于周期表第四周期
3 把函数y=cos2x+ 3 sin2x的图象经过变化而得到y=-2sin2x的图象，这个变化是（　　） A．向左平移 7π 12 个单位 B．向右平移 7π 12 个单位 C．向左平移 7π 6 个单位 D．向右平移 7π 6 个单位
4 阅读下面的文字，完成后面题。我已经说过；我向来是不惮以最坏的恶意来推测中国人的。但这回却很有几点出于我的意外。一是当局者________这样地凶残，一是流言家________如此之下劣，一是中国的女性临难________如是之从容。我目睹中国女子的办事，是始于去年的，虽然是少数，但看那干练坚决，百折不回的气概，曾经屡次为之感叹。至于这一回在弹雨中互相救助，虽殒身不恤的事实，则更足为中国女子的勇毅，虽遭阴谋秘计，压抑至数千年，而终于没有消亡的明证了。倘要寻求这一次死伤者对于将来的意义，意义就在此罢。苟活者在淡红的血色中，会依稀看见微茫的希望；真的猛士，将更奋然而前行。呜呼，我说不出话，但以此记念刘和珍君。小题1:依次填入上文横线上的词语，与文意最相符的一项是（） A．竟至竟会竟会 B．竟会竟至竟能 C．竟能竟会竟至 D．竟至竟能竟会小题2:下面对“以最坏的恶意”和“出于我的意外”这两句话的意思理解最恰当的是（） A．反动派及其走狗文人凶残下劣的程度令人发指，出人意外。 B．中国女性如此之临危不惧真是出人意外。 C．反动派及其走狗文人凶残下劣和中国女性临危不惧的精神均出人意外。 D．作者是向来从坏处看“中国人“的，但对反动派及其走狗文人凶残下劣还没有料到，中国女性的临危不惧的精神也出人意料。小题3:对“我说不出话”的主要原因分析最恰当的是（）(2分) A．因痛失优秀青年而伤心得说不出话来。 B．因“出离愤怒”而说不出话来。 C．跟段祺瑞反动政府无理可说。 D．并不是无话可说，而是此时并不想说。
5 的展开式中各项系数的和为1458，则该展开式中项的系数为_______．
6 阅读理解。 Valentine"s Day is a holiday honouring lovers. It is named after Saint Valentine, an early Christian (基督教的) churchman who helped young lovers. Valentine was killed for his Christian beliefs on February 14 more than 1 700 years ago, but the day that has his name is even earlier than that. More than 2 000 years ago, the ancient Romans celebrated a holiday for lovers. As part of the celebration, girls wrote their names on pieces of paper and put them in a large container(容器) . Boys reached into the container and pulled one out. The girl whose name was written on the paper became his lover or sweet heart for a year. Lovers still put their names on pieces of paper and they send each other Valentine"s Day cards that tell of their.love. Sometimes they also send gifts, like flowers or chocolate candy. Americans usually send gifts and cards through the mail system. But some use another way to send this message. They have it printed in a newspaper. The cost is usually a few dollars. Some of the messages are simple and short, "Jane, I love you very much. " Others say more. This one, for example, "Dan, roses are red. Violets are blue. I hope you love me as much as I love you. Forever. Mary. " Most of the newspapers that print such messages are local, but USA Today is sold throughout the United States and 90 other countries as well. This means someone can send a Valentine message to a lover in a faraway city or town almost anywhere in the world. These messages cost 80 dollars or more. An employee (雇员) of USA Today says readers can have a small heart or rose printed along with their messages this year. Will this kind of Valentine"s Day message reach the one you love? Well, just make sure he or she reads the newspaper. 1. When was the day named after Valentine? A. More than 1,700 years ago before Valentine"s death. B. More than 2,000 years ago. C. On February 24. D. It is not mentioned in the passage. 2. Which is NOT true about the ancient Roman holiday? A. Girls put into a large container pieces of paper with their own names on them. B. Boys and girls became sweet hearts by chance. C. Girls and boys send gifts and cards through the mail system. D. It was celebrated as a holiday for lovers. 3. What can be inferred from the passage? A. Printing a message to show one"s love in USA Today will cost 80 dollars or more. B. Valentine was killed for helping lovers. C. Readers of USA Today can send roses to their lovers along with the printed messages. D. Valentine was honoured by people for his firm Christianbelief and warm heart. 4. What is the purpose of the passage? A.To briefly introduce the origin of Valentine"s Day and the modern style. B.To advertise for USA Today. C. To tell you that Americans are open to express their love. D. To sell roses on Valentine"s Day.
7 Can you think of an occasion ______ you can use this gesture. A．which B．that C．when D．on that
8 已知定义在R上的函数y=f（x）满足条件f（x+ 3 2 ）=-f（x），且函数y=f（x- 3 4 ）是奇函数，给出以下四个命题： ①函数f（x）是周期函数； ②函数f（x）的图象关于点（- 3 4 ，0）对称； ③函数f（x）是偶函数； ④函数f（x）在R上是单调函数．在上述四个命题中，正确命题的序号是______（写出所有正确命题的序号）
9 已知过抛物线y 2=2px（p＞0）的焦点，斜率为 2 2 的直线交抛物线于A（x 1，y 1）和B（x 2，y 2）（x 1＜x 2）两点，且|AB|=9，（1）求该抛物线的方程；（2）O为坐标原点，C为抛物线上一点，若 OC = OA +λ OB ，求λ的值．
10 你知道自然界的许多岩石中存在的主要成分是碳酸钙吗？比如：______．