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化学 高校生

原子量を求める公式になぜ、同位体の種類の数で割るという内容が入っていないのですか?各元素の平均相対質量なら、割らないといけないと思うのですが…

相対質量と存在比から求める。このようにして求めた各元素の相対質量を 原子量 → p.42 っム 27g atomic weight 元素としての炭素の原子量は、 12 ちょうどではない 98.93 (例) 炭素の原子量= 12 + 13.003 × 1.07 =12.01 100 12Cの相対質量 12Cの存在比 13Cの相対質量 1°Cの存在比 100 自然界の炭素 12CO(質量12(基準)): 98.93% (相対質量13.003): 1.079 原子量の考え方: すべてが相対質量12.01の 炭素原子のであるとみなす 00 13C 第 1 章 各元素の同位体の 存在比はほぼー定 常に小さし 子の質量は とする機別 の数の和で O図2 炭素の原子量 存在比(%)) 原子量=(同位体の相対質量× の総和 100 →p41 同位体の質量·相対質量と存在比 (原子の数の比(百分率)) 原子1個の質量(g) 各原子の O表1 元素|同位体 H 2H 相対算業 1.6735×10-24 3.3445×10-24 99.9%8に 0.0115 1.0078 水素 2.0141 H 炭素 6C 1とほぼ用。 12(基準) 98.93 12C 19.926×10-24 12.01 13.003 1.07 13C 21.593×10-24 1.00 99.757 26.560×10-24 28.228×10-24 29.888×10-24 15.995 160 16.00 16.999 0.038 酸素 80 170 17.999 0.205 180 34.969 75.76 58.067×10- 61.383×10-24 -24 35.45 35CI 37CI 塩素 36.966 24.24 17CI 相対質量は同位体ごと, 原子量は元素ごとに求める +プラス 0物質によって,同位体の存在比にばらつきがある元素がある。そこで, 2011年より H, C, 0な ど 10種の元素の精密な原子量は, C:12.0096~12.0116 のように変動範囲で示されている。 ただ し,有効数字4桁の原子量は, C: 12.01 のように従来と同じ値を使用できる。 10 第1章 物質量と化学反応式

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英語 高校生

写真に書かれた英語の文法説明?を日本語で分かりやすく解説して欲しいです。お願いします……!

using participial adjectives USIIg real Iditionals to talk about present and future events%; Unit 2 oresent real conditional: To talk about a true or possible situation in the present, we use if + the imple present in the if clause, and the simple present in the result clause: Ifl have extra money at the end of the week, I get excited. The future real conditional: To talk about a true or possible situation in the future, we use if + the simple oresent in the if clause, and will + base form in the result clause: If you take this medicine, you will feel relaxed. We can also use time clauses to talk about the future. Notice that the structure is the same as the real Conditional: PRESENT: When I have extra money at the end of the week, I get excited. FUTURE: After you take this medicine, you will feel relaxed. Participial adjectives modify the nouns or pronouns they accompany. They are typically formed by adding -ing or -(e)d to a verb-also known as the present and past participle. (Remember, though, that the past participles of some verbs are irregular, such as freeze - frozen.) Generally, the "cause" of the feeling uses the -ing form: Her decision to quit was surprising. And the “receiver" of the feeling uses the -ed form: I was surprised by her decision to quit. ere are some other common participial adjectives: Base verb -ing -ed Base verb -ing -ed annoying annoyed frustrate frustrating frustrated annoy interest interesting interested bore boring bored satisfy satistying satisfied confuse confusing confused shock shocking shocked embarrass embarrassing embarrassed surprise surprising surprised excite exciting excited

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英語 高校生

1と2でつまずいてます😣 わかる方いましたら教えてください!

A) Reading 読解 | Theme → 助動詞/態 次の英文を読んで, 質問に答えなさい。 led Many people are afraid of the small flying animals called bats. There are stories about bats attacking people and drinking human blood. However, bats are Bats are, mammals, just like humans. There are about 1,000 different kinds 5 of bats in the world. Some weigh less than ten grams. Yet the largest bats are not a threat to people. 2 almost 2 meters long when their wings are extended. otyda 。 Most people think bats are rare. That is because they hide during the day 2 and are active only at night. However, bats can be found in almost every naw.。 the world. Some rest in trees or other places Not all bats spend their days in dark caves. 3 10 that keep them safe from attack and changes in weather. Unlike other animals their bodies are designed to@hang upside down. This is the best position for them to take flight suddenly. Bats are the only mammals that can really fly. Their wing structure, bones and muscles help them to move quickly. This helps them in 15 their search for food. Some bats use a guidance system called echolocation to fly in the dark. The creatures produce a series of noises through their mouth or nose. They can judge their distance from an object by the time it takes for the sound to return. Most bats eat insects. However, some bats drink the blood of birds, farm 20 animals and wild animals. These bats, called vampire bats, bite their victims and drink their blood, usually while the victim is sleeping. Our negative image of bats may come from them. (262 words) ots logg NOTES threat [erét] 脅威 hang hán] ぶら下がる a series of 一連の… extend iksténd] 広げる upside down さかさまに vampire [váémpaiarl 吸血鬼 rare [réar] 珍しい unlike [Anláik] …とは違って guidance system 誘導システム 8 Lesson 02

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