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Science Junior High

(2)が分かりません。  答えは1.3グラムです。解き方を 教えてください。

電子てんびん うすい塩酸 ー合えなさい。 問1 い塩酸の濃度はどれも同じであったものとします。 【実験1】 まず、 図のように,うすい塩酸50.mLを入れたビーカーと炭酸水素ナトリウム 1.0gをのせた薬包紙を電子てんびんにのせ,全体の質量をはかった。次に、 うすい 塩酸に炭酸水素ナトリウムを加えて完全に反応させ,再び薬包紙を含めた全体の質 量をはかった。また, うすい塩酸50mLに加える炭酸水素ナトリ) ウムの質量を2.0g, 3.0g,4.0g, 5.0g,6.0gと変えて,同様の操作を行った。表1はその結果を とめたものである。 やくばうし 図 炭酸水素ナトリウム 薬包紙 2% 5outl.og 3b 表1 炭酸水素ナトリウムの質量 [g] 反応前の全体の質量 [g] 1.0) (136.3 2.0 3.0 4.0 5.0 6.0 反応後の全体の質量 [g] 138.2 138.6139.2 141.39153.4 135.8y 137.2! .+14 【実験2】 137.1 137.2 138.8 150.9 0542Cor うすい塩酸の量を10㎡L, 炭酸水素ナトリウムの量を4.0gにして, 実験1と同様の操作を行って、10キ% NHCO の前後での全体の質量をはかった。また,うすい塩酸20mL, 30mL,40mL、50 mL,60mLを入れたと ーを用意し, の結果をまとめたものである。 それぞれに加える炭酸水素ナトリウムの質量を全て4.0gにして、同様の操作を行った。表2は 表2 うすい塩酸の体積 [mL] 10 20 30 40 50 60 反応前の全体の質量 [g] 106.1 117.2128.0 139.2 148.2 161.1 102.0 105.6 116.2 126.5 |137.2 146.2 159.1 反応後の全体の質量 [g]

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English Senior High

36,37,38の答えが分かりません。 どなたか教えていただけませんか?

asked strange questions so that the answers would sound funny and make them smile. that answer was true or not. Later in the interview, the volunteers were deliberately In the study, the scientists conducted interviews with volunteers. The volunteers recent study by scientists at the University of Portsmouth has shown that people can When people communicate face to face, they do not just communicate by speaking language. There are other factors involved, such as gestures. If the person you are tell if a speaker is smiling or not even without seeing their face but just by listening were asked to answer all questions with “I do in the summer,” regardless of whether talking to frowns, you know that he or she is unhappy. Whena person laughs during a conversation, you can tell that that person thought something was funny. However, a The interviews were videotaped with the purpose of gathering samples of different C 35) Smiling from Ear to Ear to their voice. of smiles. The scientists then analyzed the smiles. types According to the scientists, there are as many as 50 different kinds of smiles. T he researchers then had different group of volunteers listen to the audio portion of the recordings. This group of volunteers could tell what kind of smile the speaker had on his or her face by just hearing their voice. This indicated to the scientists that the voice has characteristics that communicate feelings and that people can interpret them. Another study also suggests that customer satisfaction is closely related to friendliness. As we all know, the best way to show friendliness is to smile. Researchers think that using the smiling voices in products or services effectively, Such as answering systems and computer programs, can contribute to better customer service. This can also be applied to hiring and training staff. Since people can tell ifa smile is real or not by a person's facial expression, and it has been proven that people, for example, customers can tell if a staff member's smile is real or not just by listening, then smiling not only from the bottom of your heart, but with your voice may be a g0od way to improve business.

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