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化学 高校生

問2についての質問です。 メタンは共有結合だからイオン結合より強い引力が働いているのではないでしょうか。 解説お願いします。

入試攻略 への(必須問題 問1 14, 15 および 16族元素の水素化合物の沸点について同族どうしで 比較すると, CHa, SiH』 ではそれぞれ -161°C, -112°Cと分子量の増 加に応じて上昇しているが, NHa, PHs では -33Cと -88°C, H.O, H.S では 100°Cと -60℃と逆に低下している。その理由は何か。 問2 アルミニウムの水素化合物 AIH。は CHa, SiHaと異なり室温では固 体である。その理由を述べよ。 (東京大) 解説 問1 -O-H, -N-H, F-Hの構造を見たら, 必ず水素結合を思い出すように しましょう。 問2 AlH。 は金属元素と非金属元素からなる結合でできており, AlP+ と H- (水素化物イオン)からなるイオン結合性の化合物だと考えられます。 CH。と SiH。では, 分子量が大きい SiH4 のほうがファンデルワールス 力が強く,沸点が高くなる。これに対して, NH3と H.O では, 分子間に通 常のファンデルワールス力より強い水素結合が形成されるため, PHs よ り NH。が, H-Sより H.O のほうが沸点が高くなる。 問2 AIH。は CH』や SIH4 と異なり, Al°* と水素化物イオンH-のイオン結 合からなる化合物である。 一般にイオン結合はファンデルワールスカよ り強い引力であるために AIHs は固体となっている。 答え 問 1 10 分子間で働く引カ 89

解決済み 回答数: 1
英語 高校生

答えと解説お願いします。。。

学習日 6) April Fools' エイプリルフール Day Jeg ns vaW 「1 Tom wanted to play a trick on Jack because it was April Fools' Day. He said. “Jack, do you know that the shop on the corner is paying 5 *"cents for old bottles? If セント you have any around the house, you should take , them to the shop." Jack always 1) wanted more money, so he didn't think about what day it was. As soon as he went back home, he asked his mother to collect all the old bottles in the house. Jack got 5 them from her and went to the shop. “Tm told you're paying 5 cents for a bottle," he said to the **shopkeeper. "Well, That will be 50 cents, please." The shopkeeper thought he 店主 here are ten bottles. 2) was joking, but soon remembered it was April Fools' Day. He said to Jack, “I think 10 someone played a trick on you, young man. 2 At first。Jack was very angry. But then he had a 'good' idea. He quickly went 3) to Tom's house and rang the doorbell. When Tom opened the door, Jack was smiling. Tom couldn't understand why Jack looked so happy. “D Did you go to the shop on the corner?" Tom asked. Jack answered, “Oh, yes. Of course. But, Tom, you were wrong. The 15 shopkeeper is paying only 4 cents, not 5 cents. I got 40 cents for ten bottles, anyway. Thank you very much for the advice." He smiled again and went back to his Own house. 3 After Jack went home, Tom began to collect as many bottles as possible. Before 20 noon, he got so many that he asked his father to carry them to the shop by truck. “I have 400 bottles for you," he said to the shopkeeper. “That will be 16 dollars, please." “You, too!" the shopkeeper said. “I know someone who **had a fine April 5) ~な日を過す Fools' Day with his friend." And then Tom knew that. he was the bigger fool. 6) 1 317 words

解決済み 回答数: 1