Grade

Subject

Type of questions

Chemistry Senior High

問7の答えが4だったのですが、まぐれで正解したので、何故これが答えなのか分かりません。 解説をお願いしたいですm(_ _)m

ⅡI 次の会話文を読み、 下の各問いに答えよ。 先生: 今日は,食酢に含まれている酢酸CH COOH のモル濃度を, 中和反応を用いた 実験によって求めてみましょう。 食酢に含まれている酸は、酢酸のみであると考 えて構いません。 どのような実験器具を用いますか。 生徒 X: ビュレットやホールピペットを用いればよいと思います。 先生: よくわかりましたね。 次に示している器具を用意していますので、自由に使って ください。 器具はすべて乾いています。 また、 中和滴定に用いる塩基は, 0.10 mol/Lの水酸化ナトリウム水溶液を用いてください。 [用意している器具] 容量25mLのピュレット 容量10mLのホールピペット, 容量100mLのメスフラスコ, 容量 100mLのコニカルピーカー, ろうと、ピュレット台, 安全ピペッター 先生: それでは,食酢をホールピペットで10.0mLはかりとって、 コニカルピーカー に入れたものを試料Aとして、 指示薬を加えて滴定実験をはじめてください。 52. 12A112 生徒Y酢酸は弱酸だから、同じモル濃度と体積の塩酸とくらべると、 1pHは酢酸水溶 液の方が大きいし、 24 和点までに必要な水酸化ナトリウム水溶液の体積は、酢 酸水溶液との滴定の方が少なくてすむよね。 生徒X : この反応は弱酸と強塩基の中和だね。 3中和点は塩基性側に偏るから, 4指示薬 はフェノールフタレインを用いることにしよう。 生徒 Y: 先生。 ビュレットに入れた水酸化ナトリウム水溶液をすべて加えても、指示薬の 色が変わりません。 何か失敗したのですか。 先生実験では,うまくいかないことはよくあります。 食酢 100ml中に酢酸のみが 4.2g/ 含まれているとして,食酢 10.0mL を用いた滴定実験で過不足なく中和するまで に必要な 0.10 mol/Lの水酸化ナトリウム水溶液の体積は何mLですか。 生徒Y a mLになります。 だからうまくいかなかったのですね。 先生:その通りです。 では、何を改善すればうまくいくと考えられますか。 生徒 X わかりました。 このままでは一度に滴定できないので. て滴定実験をすると うまくいくと思います。 b -18- を試料とし 00 60)4,20 22.4 70 150810 0-07 0.0.7 先生:そうですね。 それでは, 試料 B に指示を加えて,再び滴定実験をはじめてく ださい。 (Nat CH 問5 会話文中の下線部1~4の記述のうち、誤りを含むものを一つ選び、 番号で答えよ。 問6 会話文中の空欄 1ホールピペットを食酢で2~3回洗った後に,食酢をこのホールピペットで 10.0mL はかりとって, コニカルピーカーに入れたもの 2 コニカルピーカーを食酢で2~3回洗った後に, 食酢をホールピペットで 10.0mL はかりとって, このコニカルビーカーに入れたもの 3 食酢をホールピペットで10.0mL はかりとって、 純水で洗った後の, ぬれたま まのコニカルビーカーに入れたもの @ 4 スフラスコとホールピペットを用いて食酢を正確に 10倍にうすめた水溶液を、 ホールピペットで10.0mLはかりとって, コニカルピーカーに入れたもの 0.42g Ysg 22.4 4wel almble Boy/mod NaOH+clicot→ CHicco Na+H2O 4.28 (H+) a AA 77 全話文中の空欄 b に当てはまる記述として最も適当なものを、 次の1~4 のうちから一つ選び, 番号で答えよ。 X に当てはまる数値を, 有効数字2桁で答えよ。 770 CH3C00 ×1000=1565aL

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English Senior High

英文がわからないです心の優しい方、英文の解き方を教えて欲しいです🙇‍♀️

35 15 20 signatures in business. However, no one used fingerprints in crime work until the late In ancient times, people used fingerprints to identify people. They also used them as 1880s. Three men, working in three different areas of the world, made this possible. (1) The first man who collected a large number of fingerprints was William Herschel. He worked for the British government in India. He took fingerprints when people (7) official papers. For many years, he collected the same people's fingerprints several times. He made an important discovery. Fingerprints do not change over time. At about the same time, a Scottish doctor in Japan began to study fingerprints. Henry Faulds was looking at ancient Japanese pottery* one day when he noticed small It occurred to him that the lines were 2,000-year-old fingerprints. Faulds wondered, "Are fingerprints unique to each person?" He began to take fingerprints of all his friends, co-workers, and students at his medical school. Each print was (). He also wondered, "Can you change your fingerprints?” shaved the fingerprints off his fingers with a razor to find out. Would they grow back lines on the pots. (2) He the same? They did. One day, there was a theft in Faulds's medical school. Some alcohol was missing. Faulds found fingerprints on the bottle. He compared the fingerprints to the ones in his records, and he found a match. The thief was one of his medical students. By examining fingerprints, Faulds solved the crime. Both Herschel and Faulds collected fingerprints, but there was a problem. It was very difficult to use their collections to identify a specific fingerprint. Francis Galton in England made it easier. He noticed common patterns in fingerprints. He used these to help classify fingerprints. These features, called "Galton details," made it easier for police to search through fingerprint records. The system is still in use today. When 25 police find a fingerprint, they look at the Galton details. Then they search for other fingerprints with similar features. (4) Like Faulds, Galton believed that each person had a unique fingerprint. According to Galton, the chance of two people with the same fingerprint was 1 in 64 billion. Even the fingerprints of identical twins are ( ). Fingerprints were the perfect tool to 30 identify criminals. For mo than 100 years, no one found two people with the same prints. Then, in 2004, terrorists (I) a crime in Madrid, Spain. Police in Madrid found a fingerprint. They used computers to search databases of fingerprint records all over the world. Three fingerprint experts agreed that a man on the West Coast of the United States was one of the criminals. Police arrested him, but the experts were wrong. The man was innocent. Another man was (). Amazingly, the two men who were 6,000 5 10 136 Lesson 日本大学 470 words 22 (3) 23 024 25 26

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Mathematics Senior High

求める果物の買い方を求める式で9はどこから出てきましたか?

題 14 完大] 128 重複組合せ かきなし,もも, びわの4種類の果物が店頭にたくさんある。 6個の果物を買 うとき、何通りの買い方があるか。 ただし, 含まれない果物があってもよいも のとする。 CHART GUIDE 重複を許して作る組合せ ○と仕切りの順列と考える SUS 4種類の果物から、6個を買うというだけで, それぞれの果物の個数に指定がない。 この ような場合は、次のように考える。 買物かごを用意し, その中に3個の仕切り ( で表す) を入れ, 4つの部分に分ける。 その 4つの部分に,順にかき, なし,もも, びわ を計6個入れる。 このとき、果物を○で表すと、例えば もも2|びわ 1 もも0 3 〇〇一〇一〇〇|〇 はかき2|なし1 〇一〇〇|| 〇〇〇 はかき1 | なし2 を表す。このように,果物の買い方は6個の ○ と3個の|の並べ方の総数に対応するから, 同じものを含む順列を利用して求める。 回答 例えば,かきを1個, なしを1個, ももを3個, びわを1個買 うことを6個 と3個の仕切りを用いて 19 それぞれの果物をか で表すと, 2, 2, 1 は COTO | 000 1 0 のように表すとする。 このように考えると, 果物の買い方の総数は, 6個の○と3 個の仕切り | を1列に並べる順列の総数に等しい。 9! =84 (通り) よって 求める果物の買い方の総数は 6!3! thy Lecture 重複組合せ 異なるn個のものから重複を許して個取って作る組合せの総数は,例題の解答と同様に考えて が (n-1) 個 〇が個あるとき,それらを1列に並べる順列 の総数に等しいから、その数は n-1+rC, である。 このような組合せを重複組合せといい、その総数を,H, で表す。 すなわち nH₂=n+r-1Cr (r>n><& £W) 上の例題では、異なる4種類の果物から重複を許して6個の果物を取り出す組合せの総数を考え 4H6=4+6-1C6=9C6=9C3= ているから、その総数は 9・8・7 -=84 (通り) 3・2・1 1, な 〇一〇〇一〇 0, 3, 1, 2 1100010100 で表される。 同じものを含む順列 1

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English Senior High

質問です。 (5)のⅡ群のところは答えがクなのですが、私はカだと思ってしまいました、、、 また、(6)については、答えはイなのですが、ウだと思ってしまいました。 どうしてこれらの答えになるのかがよく分からなくて、、 教えて下さい〜!!! 宜しくお願いします。

3 次の英文は, 中学生の花子 (Hanako) が行ったスピーチである。 これを読んで、 問い (1) ~ (9) に答えよ。 (24,5) There are some people cleaning streets in my town every morning. Also, there are some *crows looking for something in the trash. Many kinds of trash are *scattered around the *dump by them. That is a problem of trash and crows. Many people don't want to *fight with crows, but they want to solve the problem. IA J There is one way to solve the problem. I often see yellow plastic bags for trash. I heard that crows 2[(7) put (1) see (5) the yellow / (I) in / () cannot / () the things] bags. If crows think that there isn't any trash in them, they will go to another place, and we don't have to fight with crows. [B] *However, many crows still come to dumps in my town. They learn quickly and understand well, and they know where to find something for their lives. So, they come back to look for it in trash if they think they can do that easily. What are they trying to find in our trash? If I can answer this question, I may find a better way to solve the problem of trash and crows. So, I started learning about crows. My uncle is studying about crows. He often watches crows in some places and tries to understand their lives. He 3 (tell) me about it last week. They get up very early in the morning and usually start looking for their food in the trash of some restaurants or food shops. In such trash, crows can find their favorite food like *French fries or *mayonnaise. My uncle said that they like *oily food. I thought it's interesting because I like the same food. [ C] Also, they want to find something for making their houses. For example, they need *soft things like dog hair or "cotton because they want to put their eggs on such things. I was surprised to learn that crows find these things very well. There are some better ideas to solve the problem of trash and crows, my uncle said. First, people should put a big *net over the trash. When there is a net, it is difficult for crows to scatter trash around a dump. Heavy nets with small mesh are better. Second, when people put their trash in the dump, they should be careful about the time. Usually, the trash is 4(collect) in the morning. Crows may come and scatter it before that if you put the trash in the dump the previous night. 【D If it is difficult for crows to get their food in our town, they will move to another place. 5My uncle knows what we can do to solve the problem of trash and crows because he always tries to understand them. I think he can see the problem from the side of the crows. 6 We don't want to fight with crows, but ? I've heard that the crows sometimes hit people. Do they want to fight with us? That may not be true. My uncle said that the crows are trying different ways to say, "Don't come around our house!" They want to protect their children when someone comes around their house. Crows are large birds and they can fly, so they look strong. However, they are afraid if someone is near them and they don't usually want to fight with us. So, they don't come around the trash when someone is there. I learned about crows and I understood them better than before. They are just trying very hard to get. things for their lives, and they can find them in our trash easily. So, I don't think they are bad. Scattering trash is a problem to us. However, if I see this problem from the side of the crows, then I will know what I can do to solve it. For example, I will not make much food trash, especially oily food trash, and I can be careful about my way of putting the trash in the dump. There is not an easy way to solve the problem of trash and crows, but now, I know it is important to think about it from the side of the crows. We often think about a problem only from our own side, but if we look at it from another side, we may find a better idea.

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