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TOEIC・English Undergraduate

自分の回答と照らし合わせて確認したいので、答えがなにになるかどなたか教えてください。 解説もあると助かります。

5 A Matter of Taste Reading Passage 042 At the age of just 22, Jamie Oliver became well known across the UK as "The Naked Chef." He called himself this not because he cooked wearing no clothes, but because he wanted to simplify food preparation so that everybody could follow his recipes. He wanted to "strip down" the idea of cooking. Since then he has had numerous TV shows, published 50 many books, and has become a household name in the UK. Today, one of the activities Jamie Oliver is best known for is his great effort to improve the school dinners that children eat every day. One day, he visited the kitchen of a typical London secondary school, and he was shocked to see how much processed junk food the kids were given to eat each day. Fat and sugar levels were extremely high, and nutritional values very 10 low. The "turkey twizzler" became the symbol of these unhealthy meals: processed meat containing 21.2% fat and only 34% actual turkey. Oliver ran the school kitchen for one year and tried to show that it was possible to serve healthy meals on a limited budget—and that kids actually enjoyed eating them. His mission was to radically change the eating habits of children in that school, and across the country. 150 200 15 20 25 CULTIES 250 His project (the "Feed Me Better" campaign) has had some influence on school dinners in the UK. After watching the documentary Jamie's School Dinners, 271,677 people signed a petition calling for healthier school meals. This led the Prime Minister to agree to spend 280 million pounds (about 37 billion yen) on school dinners, to ban some junk food from school menus, and to create a School Food Trust to provide support and advice for people preparing school meals. Research, by the way, shows that children who stop eating sugary, fatty food and instead eat Oliver's school dinners are better behaved in class, and they get higher test 300 scores, too. 350 Of course, the project has had some problems. At first, many students (and even parents) resisted the removal of the junk food they were so used to. In one famous instance, some parents were passing local takeaway food to their children through the school fence. Also, schools that followed the plan for a while were often found to gradually drift back into bad habits. After all, it is easier and cheaper to just give the kids junk food. However, Oliver's efforts represent a positive start, and with obesity becoming such a huge problem (see Unit 4), 400 it's a very necessary start.

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Chemistry Undergraduate

2〜4がわかりません。2は近似して計算してみたのですが3、4につながる答えにならず困惑しています。教えて頂きたいです。

課題2 以下の操作は、 第2属の金属イオンを沈殿させるために、 0.3 M塩酸酸性に相当する水素イオン濃度に溶液を調製する過程 である (テキストp.47)。 ろ液2(全量)を注意深くpH試験紙で確認しながら、アンモ |ニア水を用いてpH=3程度の微酸性とする。 ここに6M塩酸を 0.5mL加え、純水で希釈して全体を10mLにする。 1)0.3M塩酸の水素イオン濃度[H+]を求めよ。 2)この操作で本当に1) で求めた 0.3 M塩酸酸性に相当する 水素イオン濃度になるのか検証せよ (水の電離の影響を考え なくてもよい)。ヒント: pH=3の溶液をある量(例えば9 mL) と仮に定めると考えやすい。 pHの計算 実験テキスト : 1.5 一般化学 : 14-7-14-10 課題2続き 3) 前ページの操作のうち、 「pH=3程度の微酸性」の部分を 「pH=7の中性」とした場合 (実際にそのように調整するのは 難しい)、 1)と比べてpHがどれくらい異なるか検証せよ。 4) 前ページの操作のうち、 操作に不手際があり、 「純水で 希釈して全体を10mLにする」 部分が 「純水で希釈して全体 を12mLにする」と変更せざるをえなくなった。 このとき、 0.3 M塩酸酸性に相当する溶液を得るためには、どの部分を変 更する必要があるだろうか。 説明せよ。

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