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化学 大学生・専門学校生・社会人

(5)の赤線でかいてある、体積が20mlのところが分からないです💦なぜそうなるのでしょうか 教えてください🙇‍♀️

<中和> いて、メスフラスコにはかりとり、 水溶液A10.0mLをホールピペットを用 これに純水を加えて正確 水溶液 B10.0mLを別のホールピペットを用いてコニカルビーカーに に100mLに希釈した。これを水溶液とする。 はかりとり、 これに0.100mal/Lの塩酸を滴下し NaOH+HCl→NaCl + H2O 1/5 [H+] 147 (3) 水溶液Aのモル濃度は何molmo 有効数字2桁で記せ。 A.NaOH+HCl→NoCl + H2O 希釈前のNaOH水溶液Aのモル濃度をc[mol/L] とすると、希釈後の水溶液のモル濃度は,C×400[mm] 図の曲線より、中和点までに要した。0.100mol/L の塩酸の体積は、6mLだから、 20 1000 ①内反応がおこる。 144 溶液に水や溶媒を加えて薄める事 塩酸の体積 1x 6x 100 [mol/] x 1000 [2] = 1 * 0.100 [math] x 1000 [L] よって、c=0.6 mo No. して、PHを調べた。 [H+]=モル濃度(mol/L)×電離度 7ナ Date (5) 0,100mol/ 塩酸を10.0mL 適下した時のコニカルビーカー 内のPHはいくらか?小数第一まで求めよ。Logio2=0.3/Log13=0.48. A.塩酸を10.0mL 適下した時、そのうちの6.0ml分は、①の中和反応 により、消費されるので、残りの4.0ml分の塩酸が反応せずに 水溶液中に残ることになる。なので、コニカルビーカー内の水溶液 中の水素イオン濃度[H+]は、水溶液の体積が20.0m上であること に注意して、次のように計算できる。 0.100 mol/ x 1000 L 2.0×10mol/ PH= 6.0 10 - log₁0 (2₁0×10-2) =2-log122=117m

未解決 回答数: 2
物理 高校生

この問題の(4)なんですが力学的エネルギー保存則を用いて解いていますが、自分は放物運動の鉛直方向の考えを利用して解きました。 質問がそもそも自分の考え方でこの問題が解けるのか、 解ける場合何が間違っているのかを教えて欲しいです。

出題パターン 19 力学的エネルギーの保存 図のようになめらかな水平面となめらかな斜面を接続し,左端の壁に質量 の無視できるばねを固定する。 質量mの小球Aをばねに押しつけて aだ け縮めて静かに放すと, 小球Aはばねが自然長になったところでばねから 離れ,そのまま床の上を進み,B点を通過して斜面をすべり上がり,斜面を 飛び出して最高点まで上がり、床に向かって落ちた。2009 140 重力加速度の大きさをg, ばね定数をk, 斜面の端C点の高さをん,斜面 の傾きを45°とし、空気の抵抗は無視できるものとする。 工学 A NES mo NOS- B C h L ** 45° (1) 小球A がばねから離れたときの速さvo を求めよ。 (2) 小球AがC点に達したときの速さをvo を用いて表せ。 0 (E) N (3) 小球 A が斜面をすべり上がって C点を飛び出すための a の最小値を求 めよ。 NPMS (4) 小球AがC点を離れ, 最高点に達したときの高さLをv を用いて表 RA[/² EXI せ。 平 SI-A リビ団子 ちも大公平木りおち私の息

未解決 回答数: 2
英語 中学生

英検の過去問なんですが、答えが見つからない ので答えを教えてほしいです

(2) (1) A: Mom, I met a ( B: That's great. 1 famous (5) (6) 1 (18) Grade 4 (8) 2 次の (1) から (15) まで ( 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、その番号のマーク欄をぬりつぶしなさい。 (3) A: When did the Sylvia Hotel open? B: In 1913. It's over a hundred years ( 1 many 2 quiet (4) A: Everyone is here, so we can ( B: OK. 1 visit Mary ( 1 misses day. (7) A: Your ( Ted made some friends at his new school, so he was ( thin 1 2 slow 3 glad Peter became a ( 1 member B: Thank you. 1 question Grade 4 2 next ) soccer player on the train today. 2 start 3 hard 2 bench ) to get a bird for her birthday. 2 picks 3 hopes 1 That's my dream. 3 I'll watch you. 1 Have fun. 3 Not yet. 3 tall 1 Did you make them? 3 Is it finished? Daughter: I will. 1 I'm hungry. 3 stay at home. 3 carry ) of the swimming club. ) is so beautiful! I love seeing the flowers in spring. 2 holiday 3 sound 2 ) the movie now. 3 salad 3 moved (17) Father: How was your band practice today? Son: ( ) We learned a new song. 1 I have a ticket. 3 You're right. I ( ) a bad cold today, so I couldn't have lunch with my grandmother. I was really sad. 1 kept 2 had Mother: Would you like a cupcake? Daughter: Yes, please. ( ) Mother: No, they were on sale at the supermarket. 4 thick (19) Girl: Thanks for studying with me today. Boy: ( ) I enjoyed it. 次の (16) から (20) までの会話について ( 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、その番号のマーク欄をぬりつ ぶしなさい。 (16) Girl: I love playing the piano. Boy: Do you want to be a professional pianist in the future? Girl: Yes. ( ) 4 old lazy 4 drop 2 After math. 4 No problem. (20) Daughter: Dad, shall I cut the vegetables for the salad? Father: Yes, please, but ( 4 follows He swims every 2 It's my guitar. 4 You can have one. 2 it's a fruit. 4 be careful. 4 towel 4 garden 2 It was fun. 4 It was on the radio. 4 rode 2 Will they be ready? 4 Are you late? (9) (12) Grade 4 (13) A: What can you cook? B: I like to make food from different countries. ( Italian food and Chinese food. 1 For 2 To (10) A: Did you meet the new English teacher? B: Yes, he comes ( 1 until 2 (11) A: What ( (14) 3 ) of dog do you want? B: I want a big dog because I love to go on long walks. 1 room 2 wind 3 kind (22) (15) A: Excuse me. ( B: That one is $10. 1 Where (23) After school, Chris enjoys ( listen to her funny stories. 1 talking 2 opening (24) 4級 354. 34 $18,73 Today, it will snow much ( and I will make a big snowman. 1 harder 2 hard (25) (21) 新しいくつを買ってはどうですか。 1 arplad I love riding my bike to the park, but my sister ( likes to stay at home. 1 haven't 2 doesn't Brush breakfast. 1 ) South Africa. He loves rugby. along 3 This is 10 みが 朝食を食べたら歯を磨きなさい。 (after 2 your 3 you 2番目 1 2 Why (4) 2 ( you buy 3 why 4 new shoes 2番目 4番目 1 2 5 My brother tomorrow. ) much is this T-shirt? 3 2 3 As スープをもっともらえますか。 have ( soup can 2 2 Grade 4 LI 856 次の (21) から (25) までの日本文の意味を表すように ①から⑤までを並べ の中に入れなさい。 そして、2番目と4番目にくるものの かえて 最も適切な組合せを1,2,3,4の中から一つ選び、その番号のマークを ぬりつぶしなさい。 ※ただし, ( の中では、夏のはじめにくる語も 小文字になっています。 2番目 2 over W 4 from 2番目 3 holding BEL はじ これは私の初めてのシンガポール旅行です。 (Singapore 2 my first 4 to ) with his teacher. 3 don't 2② 3 hardest 3 When ) than yesterday. 3 4 eat 5 teeth) 3 4 In 4 3 4 side ) example, (3) some more 3 (5 3 4 asking 5 trip) 5 don't) He likes to 4 isn't (4) (write 2 to 3 by 4 has 5 a report) 2番目 2 4番目 わたし あに あす 私の兄は明日までに, レポートを書かなければいけません。 4 too hard ). 4 How (51) My brother She 4 4番目 ⑤5⑤ - (3) (3) please? 4 3-0

未解決 回答数: 1
英語 高校生

これといてください。至急です お願いします 英語分かるかた

2010 解答用紙を6/1(木)に提出 解説は英語でします。 【1】 次の英文を読んで、後の設問に答えよ。 (配点 50) A few years ago, a certain famous university in Japan asked a unique question as its entrance examination in English. The question was this: Write a reply in English to a junior high school student who doesn't like studying. He says he has no intention of going abroad, so he doesn't think he needs to study English. Nor does he want to get a job in which the knowledge of math or science is required. He, therefore, insists that he cannot understand the reason he is forced every day to study subjects he is not interested in. As an entrance examination, it's not very difficult to write an answer to this question. (2) you take it seriously, however, it touches on such a profound aspect of human nature that it is worth thinking about. Fundamentally, why do you have to study? What is learning for? Would you still like to study even if there were no schools or examinations in the world? In my opinion, it is possible to answer such questions from a practical and essential point of view. First, it is not rare for anyone to find changes in their own preferences or desires over time. Sometimes we find ourselves possessing no interest in what we thought to be precious before. Sometimes we are surprised to realize that what we thought to be of little value is so important. So it is quite hard, especially for young people, to predict actually what one will want in the future, say, ten years from now. That's why it is highly desirable for students to prepare for their future by increasing their knowledge and improving their intelligence. Whatever job one may get, it is quite (4) that knowledge or intelligence gets in the way. This can be demonstrated partly by many adults confessing that they should have studied harder. ( 5 ), it's only while one is young that one has a good memory and can absorb and retain a vivid impression of what one has learned. Next, I would like to talk about a more subtle viewpoint. Essentially, no human beings can be satisfied with what they already have, and everyone has, at 1921 the bottom of their heart, the desire for a better existence. Please do not interpret (67 INT this only in terms of materialism or religious belief. Of course, food, clothing. and housing are important. Still, ( 7 ). Also, in the present age, it is difficulí to feel there is anything in the belief that God will come to help you have a better existence some day. Even if all of your basic needs are met, without one important thing, you cannot feel that your life is meaningful. This one thing is the ambition to improve yourself. When you learn something you didn't know before, you will surely feel the satisfaction that no other element in life can give. In this sense, learning will enable you to broaden your world, giving you the joy of knowing. In short, learning is an important way to make your own life richer. (A) 下線 (1) (3) を和訳せよ。 (B) 空所 (2) ( 5 )に入れるのに最も適切なものを、それぞれ次のア~エ の中から1つずつ選び、 その記号を記せ。 (2) 7 Because If (5) 7 For example In conclusion Though In addition What is worse (C) 空所 (4) に入れるのに最も適切な 同じ段落の中から抜き出して、 解答欄に記入せよ。 下線部)が表す内容を、 本文に即して70字以内の日本語で説明せよ。 1931 1. Unless

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