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化学 高校生

質問です Pbは塩酸や硫酸には溶けないということは理解したのですが、硝酸には溶けますか?

12 (1) mol (2) 1.2×10mol (3) 48mg/L マンガン酸イオン MnO² 酸素 O2 酸化剤としてはたらくとき [[MO] [+8H[+] + 5e 0 + 4H+ + 4e マンガン酸カリウム KMnO [1mol は 5mol の電子を受け取り、Og または O + 4e- -mol 分に相当する。 mo ②週水20mL中の有機物を酸化するために、 5.0×10mol/L 1mol は 4mol の電子を受け取る。したがって、 KO1mol のはた KAO, 水溶液が4.8mL必要であったので、 1L(1000mL)中の有 化するのに必要な KMnO の物質量は、 4.8 1000 ml. 1000 20 ml. → MI + 4HO → 2HO → 20 =1.2×10mol 5.0×10mol/Lx は、試料ILに含まれる有機物を酸化するのに要するO2の質 位で表したものである。 (1)より、Kino.1molは、20 #*. mg -Lx. [molに相当するので,この河川水1L中の有機物を酸化するのに 必要なの物質量および質量は、 15 1.2×10molx -=1.5×10-³ mol 32g/mol×1.5×10mol=0.048g=48mg よって, COD は 48mg/Lとなる。 157 A:Zn B: Cu C: Na D : Ag E : Pb F: Fe G: Sn イオン化傾向の異なる金属を接触させると, イオン化傾向の大きい イオン化傾向が大きいと酸化されやすい。 B>D ほうはさらに反応しやすくなり, 小さいほうはさらに反応しにくく なる。 F G およびA>F (4)Cのイオン化傾向はきわめて大きい。 (5) イオン化傾向が水素より大きい金属は塩酸と反応して水素を発生。 A,C,F,G>H2>B,D 塩化鉛(ⅡI) PbClや硫酸鉛(ⅡI) PbSO4は水に不溶なため, 鉛は水 素よりイオン化傾向が大きいが, 塩酸や希硫酸には溶解しない。 つ まり, EはPb である。 よって, C>A>F>G>E>B>D Na Zn Fe Sn Pb Cu Ag 67 COD は、 chemical oxygen demand の略である。 塩化鉛(ⅡI)は冷水に 不溶だが、熱湯には溶け る。

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英語 高校生

考えても分かりません。解答お願いします

20 Unit 1 - History - Gutenberg is famous for inventing printing, but he didn't really invent it. He invented a better way of printing. [2] For hundreds of years people used blocks of wood* to print. They used a knife to cut words backward in the block of wood. Then they covered the block with ink and pressed it onto paper. When they pulled the paper from the inky blocks, the words appeared on the 金属 5 paper in the right direction. In Korea and China, people printed with metal type* instead of 右向き wood. (2)Either way, printing was difficult and very slow. It took several years to make one copy of a book. [3] Books were very expensive and rare. Only ( 3a ) people could buy them, and ( 3b ) 10 people could not read. But, as ( 3c -) people learned to read, books became more popular. So people wanted to find a quicker, better and less expensive way to print books. One of these people was Johannes Gutenberg. opsugas.l Y tinU 9003 iinil 4 Gutenberg was born in Mainz, Germany, around 1400. He was good at working with metal, but probably had no idea how people printed in China. His idea was to make a piece Clarey operan 15 of metal type for each letter of the alphabet and use the letters (4)over and over. (5)He could put the type together to make words and arrange words to make pages. With ink on the type, he could press paper on them to print a page. A "printing press" machine could make hundreds of copies of a single page quickly. After that page, he could rearrange the same letters to make other words and print other pages. LISSH Si nou 5 It took Gutenberg a long time to make the type for each letter of the alphabet. When he finished the type, he didn't have enough money to make the printing press. He borrowed money from a man named Johann Fust. After many years, Gutenberg's printing press was Legione ready. Gutenberg printed his first book, the Bible, around 1455. 6 There are only twenty-one complete copies of the original Bible. They are some of the 25 most expensive books in the world. In 1987, part of a Gutenberg Bible sold for $5.3 million. 7 Today people remember Johannes Gutenberg. The city of Mainz has a statue of him and a museum. His original printing press is in the museum. (6)They print several pages a day to show that it is in good condition. earoviaU 012mu 394 words/#IN block of wood: type: vrigsypola 01 sind 7 an Oupside down & 下線部 (6) を日本 7. 本文の内容に合わ Many people & Gutenberg g Gutenberg Olt was a long Though Gu cost a lot of Hannes Rotest

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