学年

教科

質問の種類

化学 高校生

この文章のfとgの部分が分かりません。詳しく教えてもらえると嬉しいです。

次の文を読んで問いに答えよ。 原子核を構成する陽子の数をその元素の原子番号)といい, 陽子と中性子の数 の和を(質量数)という。 天然に安定に存在する炭素には、(イ)が12のC] と(イ)が13 [123C]の2種類がある。 このように(ア)が等しく, (イ)の異な る原子を,互いに同位体)であるという。(ウ)の化学的性質はほぼ等し い。 天然に安定に存在する水素には]HとHの2種類, 酸素には(イ)が16 17 18 の [10] 101[180]の3種類の(ウ)が知られている。このような複数の ( c[ ウ)の組み合わせを考慮すると,水は ( 9 )種類の水分子の混合物と考えられる。 炭素の(ウ)のうち, [ 'C] は放射線 (3線)を出して [17] へと変化する 14 14 力(放射性同位体あり,天然には極微量しか存在しない。[f]は宇宙線による原子 核反応により地球の上層大気中でたえず生成しているので,その存在比は、時代や地域 にかかわらず,大気中ではほぼ一定である。 生物体中の [f]の存在比は,生きている 間は大気中のそれと同じであるが, 生物が死滅すると外界からの供給が断たれるので, 時間の経過とともに指数関数的に減少していく。 したがって, [f] の存在比から生物の 生存していた年代が推定できる。

解決済み 回答数: 1
英語 高校生

問4の(2)についてです 私は(2)に「先生を思い出す」と言う意味でウを選んだのですが、答えはアでした。なぜウだと不適なのか教えていただきたいです🙇🏻‍♀️😭

(配点 23) Everyone wants to do well on tests. Here is some advice from successful students on how to do well on tests. Listen to the teacher from the first day of class for hints about what is important. For example, the teacher will emphasize the important information by repeating it or telling you it is important. When you look over your textbook and notes again, you should already know what is important. After each lecture, look over your notes again. Come to class ready to ask questions about what you don't understand. C Look at the visual aids the teacher uses. For example, if the teacher asks you to look at a diagram or graph in your textbook, make sure you understand why that diagram or graph is important. There may be a question on the test that asks about that diagram. Study for an essay exam. Students who prepare for essay exams do better on all types of exams. Students need to know more information for essay exams than for true/false or short-answer exams. There are no hints on the exam itself, so students must learn more for essay exams. To prepare for an essay exam, always read the *material twice before you start taking notes. When you read the material the first time, it may seem difficult. When you read the material the second time, it will seem easier. This is similar to when you (1) have to find the way to a friend's house for the first time. The second time you go to your friend's house, it's easier because you know the way. It may even seem shorter because you don't have to slow down as much to check street names or landmarks. The same is true with the material you read. The second time you will already know the words and ideas. In China, they lp to stop de After you've read the material twice, take notes. At this point, you'll find that you know some of the material and can focus on what is most important. Don't ignore *footnotes in your reading. Sometimes teachers think the information in a footnote is important and will ask a question about it. Write down the important information in is in the years t your notes. After you take notes, go back and add your opinions to them. Write down For food in the desert. the ideas that you agree with and the ideas that you disagree with. People remember ants ex large number

解決済み 回答数: 1