学年

質問の種類

化学 高校生

酸化還元反応の計算問題で化学反応式を立てる時の決まりはありますか?どっちの物質が還元されてるなどが検討がつきません。

酸化還元反応 計算プリント(計算式・答えは右に) 1 次の文を読んで、下の各問いに答えよ。 硫酸酸性のシュウ酸水溶液にニクロム酸カリウム水溶液を加える (1) シュウ酸 0.60mol を酸化するには、ニクロム酸カリウムは何mol 必要か。 (2)0.15mol/Lのシュウ酸水溶液20mLを酸化するには, 0.10mol/Lのクロム酸カリウム水溶液を何 mL 加えればよいか。 解答 1 (1) (COOH)2 →2COz+2H++ ・Gr20+14H++6→2G3+クH2O (cool)2 M 2xa60 2 0.252gのシュウ酸の結晶 (COOH)2H2O を水に溶かしての正確に100mLとし,その中から 25.0mLを正確にとり, 硫酸で酸性にした。これを温めながら0.010mol/Lの過マンガン酸カリウ ム水溶液を少量ずつ加えて反応をちょうど完了させた。 (COOH)22H2O=126 (1) 下線部①および②の操作で用いられる器具の名称を記せ。 (2) 下線部③の反応がちょうど完了した時点をどのように決めるか。 (3) この滴定で, 過マンガン酸カリウム水溶液は何mL必要か。 3 濃度不明の過酸化水素水がある。 この水溶液の過酸化水素の濃度を過マンガン酸カリウム水溶液 を用いた酸化還元滴定で求めた。 過酸化水素水 10.0mL に入れ, 希硫酸を加えて硫酸酸性にした。 0.020mol/Lの過マンガン酸カリウム水溶液を少しずつ滴下していくと, 8.0mLを加えたところで終点 となった。 この過酸化水素水のモル濃度を求めよ。 (5004)2 x=0.20 Karaly 6個xx 10,20 mol) 20 2x0.15× 6×0.1x. 1000 x 1000 X=10 ( 10 mL) (1)① メスフラスコ (3) の ②ホールピペット 消えなくなったと (cooH)2→2CO2+2H++2e- MnOf+8日+5→M+4H2O × 25= 100 H2O2O2+2H+2 X=20 KMnO4 5×0.01x 20mL) 1000 x=0.040 Kunds =5×6.02× 8 1000 0.040 mol/L) Mnogt8tl+se M4120 2xxx 10 1000 ~ ((00) 2 4 0.12mol/L ニクロム酸カリウム水溶液20mLに希硫酸を加えて酸性にした水溶液と、 ある濃度の硫酸 鉄(II) 水溶液 60mL が過不足なく反応した。 この硫酸鉄(II) 水溶液の濃度は何mol/Lか。 2x0252 126 3 酸化還元の計算のポイント Ch0+14H++6→2G3+クH2O Fet K2Cr2O7 20 6×0.12×1000 = →Festte- Feloq xxx 60 1000. 10.24 mol/L)

解決済み 回答数: 1
英語 高校生

文法問題です。答えがないので合っているかどうか教えてほしいです

Choose the best answer to fill in each blank. (1) I like that white bicycle of 1 she 2 her 4 herself Fil 1 【神戸学院大 】 sa (1) p.495 (1) I f 3 hers many people in the I v (2) p.153 (2) H (2) The photographer is well known United States. Let's go and see her photo exhibition. with H as (3) Stop talking. 2 for Didn't you hear the bell ( 3 to )? 【 関東学院大】 (3)参 p.178 1 rang 2 rings 3 ring 4 ringed (3) D (4) The book is ( ) a guide to Africa as a story set in the (4) .265 【日本女子大 】 area. 1 no less than (4) 2 none the better for 3 not so much 4 not the same (5) (5) We requested that the meeting ( ) put off. finished our preparation. We hadn't (5) p.327 1 be (6) Please help yourself ( 2 should 3 is 4 would be (6 ) whatever you like. 【桜美林大 】 (6) p.498 1 by (7) Do you know that young lady ( 2 in 3 for 4 to 1 talk 2 talking ) with our boss? 【日本歯科大】 3 to talk 4 talked (8) I brought my friend to the cafeteria to eat lunch. After eating (7) 参 p.224 (8) 参 p.340 lunch, he asked me ( ) smoke there. 【名古屋工業大 】 ① that he can 2 where could he 3 whether or not 4 if he could (9) "I think Matt is a hard worker." "You ( ) be joking. He's rather lazy." A (9) p.117 ①had better ③ have 2 must would rather (10) We should decide when to start the new project ( discussed the other day. 1 which 3 with which (11) I sent Jane two letters, ( ①neither of which 3 of neither which for which 4 in which ) she has received. 2 neither which which of neither AJEA ) we (10) pp.58, 285 【創価大】 (11) 参 .306

解決済み 回答数: 1
英語 中学生

英検3級の問題です 勉強はしているのですがなぜか正答率が上がらなくて困ってます💦 どうして間違えるのか、どうすればいいのか得意な方アドバイスお願いします🙏

B: Sure, Andy. No problem. ) the rules? 2 wake 模擬試験 注意 音声はポケリスアプリで聞いてください。 実際の試験ではマークシートが配布されます。 この模擬試験では解答をそのまま 書き込んでください。 1 次の(1)から(15)までの( )に入れるのに最も適切なものを 1, 2, 3, 4の中から一つ選びなさい。 ⑩ask (8) The homework Mr. Baker gave us is a ( little 2 less 3 sell ④explain difficult. I need someone's help. ) 3 many 4 more (9) My hobby is cooking. When I was little, my grandmother often taught me ( cake. 1 why 2 what (10) A: Do you like climbing mountains? B: No, I don't like it at ( 1 every 3 how ) because I get too tired. 2 best 3 all 4 who 4 each (1) A: Are you going to ( ) the basketball club? B: Yes. That's my favorite sport. 1 leave 2 move 3 join (2) A: I will go to the new ( ). Do you want to come with me? B: Yes, I'd love to. I want to see the dolphin show. 1 stadium 2 aquarium (3) A: Would you like another piece of pizza? B: No, thanks. I'm already ( ). 1 angry 2 local 4 drive 3 shape 4 capital 3 thirsty (4) A: Can I see your student card? I need to check your name and ( B: OK. Here you are. 1 line 2 air 4 full ) to make a (11) Ann was ( ) from school yesterday because she had a bad headache. She also had fever. 1 serious 2 familiar 3 absent 4 expensive (12) Michael has been practicing tennis very hard for two years. ( ) last, he won firs the tennis competition yesterday. I On At (13) A: Do you know the boy ( ) with Jenny? 3 By B: Yes. He is from England. He will study with us for two months. 4 Of (1 talked talking (14) A: I like this song very much. 3 talk 4 talks B: Oh, I know this song. It is ( ) in many countries. age 3 statue 1 sing 2 sang sung sir (15) Students ( who 2 whose ) want to go to the ski camp must come to the cafeteria af 3 what 4 v 3 bring 4 steal (5) A: Excuse me, how many books can I ( ) from this library? B: Five books. You can keep them for ten days. ⑪borrow 2 lend [6) A: Have you finished your breakfast, Betty? B: No. I'm ( ) eating, Mom. still 3 else 4 away ever

解決済み 回答数: 1