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化学 高校生

電気分解についてです。陰極での反応の部分で、•cu2+,Ag+のようにイオン化傾向が小さい……… と書かれているものがありますが、このイオンというものは水溶液中に存在するものなのでしょうか???教えていただきたいです

分 dix キ 電気分解 electrolysis D 電気分解 ようゆうえん ゆうかいえん 外部 ●電気分解 電解質の水溶液や高温の溶融塩(融解塩)に電極を入れ, さんかかんげん から直流電流を流すと,各電極で酸化還元反応を起こすことができる。 でんき ぶんかいでんかい。 れを電気分解 (電解) という。 電気分解は,これまでに学習した電池とは逆 に,電気エネルギーを使って化学反応を起こす操作といえる。 ●電気分解のしくみ 電気分解では,直流電源(電池) の負極につないだ電 いんきょく ようきょく 極を陰極,正極につないだ電極を陽極と呼ぶ。電気分解の電極には、ふっ う化学的に安定な白金 Pt や黒鉛C を用いる。 こくえん 電解質水溶液の電気分解では,陰極と陽極で次のような反応が進行する。 電子を受ける。 《陰極での反応》 電子が流れ込む陰極では,最も還元されやすい物質 が電子を受け取る (還元反応)。 .2+ ・Cu²+,Ag+ のようにイオン化傾向が小さい金属イオンが存在する 場合は,これらが還元されて, Cu や Ag が析出する。 せきしゅつ ・K+ や Na* のようなイオン化傾向の大きい金属イオンが存在する場 合は,これらの金属イオンは極めて還元されにくいので、代わりに H2O(酸性溶液では H*)が還元されて,H2 が発生する。 《陽極での反応》 電子が流れ出す陽極では,最も酸化されやすい物質 が電子を失う (酸化反応)。 【白金,炭素を陽極にした場合】 ・水溶液中にCI やⅠ などのハロゲン化物イオンが存在する場合は, これらが酸化されて, Cl2 や I2 が生じる。 ・水溶液中に SONO3 などが存在する場合は、代わりにH2O (塩基性溶液ではOHT) が酸化されて O2 が発生する。 【白金や炭素以外の金属を陽極にした場合】 ・その金属自身が酸化されて, 陽イオンとなって溶け出す。 15 5 10 25 of ev ta TU オ 20

未解決 回答数: 1
英語 高校生

4の解き方がわかりません。 例えば(a)で、続く文であくびを謝っていることも全て把握した上で、挨拶なのでpolitelyかと考えたのですが、なぜ誤りなのか教えていただきたいです。

13 Lucy is a British schoolgirl who lives in Oxford. She is talking to her father, Fred, in the kitchen of their home. Read the conversation below and answer the following questions. Lucy: (a) Good morning, Dad. Oh, sorry for yawning. What are you doing with that microwave oven? It looks heavy. Do you need a hand with moving it? Fred: I think I'll be OK, Lucy. I'm just going to put it in the car and take it to the city dump. Lucy: Couldn't you send it away to be repaired? Fred: It's ten years old and well out of warranty now, so I very much doubt that the manufacturer would do it. They probably don't even carry the spare parts anymore. Lucy: That's a shame. Oh, I know what! Why not take it to the Repair Café near my school? Fred: What's that? I've never heard of it. Lucy: It's brilliant! We visited it as part of our environmental science course recently. It's a meeting place where people can get together to mend broken items cooperatively. And have a chat and a cup of coffee! Fred: I'm all ears. Tell me more. Lucy: Well, the first Repair Café was started by a Dutch woman called Martine Postma in Amsterdam in 2009. (1) 彼女は,使い捨て文化で環境が破壊されて, ゴミの量が地球規模で増えることを心配してたん . She wanted to find a local solution to this global problem. Fred: That's what they call "thinking globally, acting locally," isn't it? Lucy: Exactly. She also wanted to address the decline in community spirit amongst urban dwellers and do something about people's loss of practical skills and ingenuity. Fred: And the idea (2) caught on? Lucy: Very much so. The concept has grown into a global movement. The one in Oxford started about four years ago. Fred: Impressive! What kind of things do they repair? Lucy: Oh, all sorts. Electrical appliances, clothes, furniture, crockery, bicycles, and even toys. Fred: How successful are they at repairing things? Lucy: Well, of course, they cannot guarantee to fix every item brought to them, but they have a fairly good success rate. One study found that on average 60 to 70 percent of items were repaired. The rate is higher for some items such as bicycles and clothes but lower for things like laptop computers. Fred: I can understand that. Just between you and me, I think some electronics manufacturers deliberately make products in such a way that you cannot disassemble them and repair them unless you have specialized tools and equipment. Lucy: Yes, and that's where Repair Cafés can help. But these cafés are not just about repairing things for people. They are places where we can meet others, share ideas, and be inspired. The volunteer repairers are very keen to involve the visitors in thinking about the repair and actually carrying out the repair themselves. They also encourage people to think about living together in more sustainable communities. Fred: I suppose you could say they are about repairing our minds, not just our things. Lucy: Quite so, although often the two are very closely related. Many people attach (3)sentimental value to old things that might, for example, be part of their family history. Fred: I see what you mean. It almost sounds too good to be true. (a)Is there a catch? For example, how much does it cost? Lucy: Advice and help from the repairers is free, but people who use the café are invited to make a donation. That money is used to cover the costs involved in running the café. If specific spare parts are needed, the repairers will advise you on how to obtain them. Fred: Well, that's marvelous! (e)Then I'll take this old microwave there. Are they open today? Lucy: Yes, and I'll come with you. I've got a pair of jeans that are badly in need of some attention. QUESTIONS 1. Translate the underlined part after (1) into English. 2. What does the underlined phrase after (2) mean? Select the most appropriate expression from the list below. (A) became popular (B) hit a dead end (C) occurred to you (D) played a significant role (E) worked in practice 3. The underlined phrase after (3) means the value of an object which is derived from personal or emotional association rather than its material worth. Give ONE object that has "sentimental value" for you and explain why it has such value. Your answer should be between 15 and 20 English words in length. (Indicate the number of words you have written at the end of your answer.)

解決済み 回答数: 1
英語 高校生

この英語の問題がわかりません…… 分かりやすい解答とこの問題の問題集を教えてくださると嬉しいです!

DAY2 文法・語法・語彙 ■4】 次の設問 (A), (B) に答えよ。 (配点 30 ) (A) 次の(1)~(6)の各英文には、下線部ア~エのいずれか1つに文法・語法に関して不 適切な あるいは文意を通らなくする箇所が含まれている。その下線部の記号を記 せ。 to consult → consult (1) Electronic dictionaries enable us not only to search words we want to find out the meaning of very quickly but also to consult several dictionaries at the same time. My I- 3 or T (2) I recently moved to a new neighborhood. The reason is why I wanted to p live close to my office. Now I can walk to the office within 20 minutes, which イ近くに住んでる. ウ makes my life easier and less tiring. (3) When you shop for a smartphone, having many options are great, but it might make it difficult to figure out which ones have the features you'll actually use. (4) Because there is so much personal information readily available online, it is far easier now than the past for criminals to steal others' identities. (5) Personally, I am against the idea of sending aging parents to nursing facilities because I have long convinced that home is where they feel happiest. (6) Nowadays people are talking about the possibility of e-sports, a term_referring to organized, competitive computer gaming, will become an Olympic spom in the near future, though some doubt if it deserves to be one. ェー

回答募集中 回答数: 0
英語 高校生

この空欄に共通語を入れないといけないんですけど分からないのでよろしければ全部じゃなくても良いので手伝っていただきたいです💦

(3) (a) We must keep an ( ) on the political situation. (b) She hit him hard and gave him a black ( ). (4) (a) This is going to cost you a good ( ) of money. (b) In this African town, there are many merchants who ) in diamonds. (5) (a) That politician always takes a strong () on difficult social issues (b) He was so shocked by the news that he could hardly ( ) up. (6) (a) Why are you sitting so far ( ) from us? Come over here and join us. (b) The two brothers look so much alike that it is difficult to tell them ( ). (c) The dog has pulled the newspaper ( ) again! (d) I don't like to mix business with pleasure, but try to keep the two things firmly ( ). (8) (a) In my ( ) you should try the exam again. (b) The ( uldn't got (7) (a) () all his campaigning, he couldn't get enough votes to win. (b) It might be better for us to make allowance ( ) his inexperience because he is a newcomer. (9) (a) You will be sure to like him, ( ) you talk with him. (b) He writes a letter ( ) in a while, but not so often. The earth goes around the sun ( ) a year of 251) (10) (a) A( ) from the mountain top was spectacular. ) is a place where you can get water. (b) The doctor said that he would be ( (11) (a) Will you ( 15 (c) He has knowledge and experience as ( ). ) if he took this medicine. ) after the children while I'm out? in the long run 結局は (b) ( ) in the mirror before you drive off

解決済み 回答数: 1