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English Senior High

「,well behind 」の部分の構造、意味を教えてください。

[Review] Back in the late sixties, thinkers on both sides of the Atlantic were troubled by problems which may seem strange to us today: they were worried that the leisure age which they believed was fast approaching would leave people with too much time on their hands. They were worried that the work ethic was losing its grip on a new rebellious generation and they pondered how they would motivate people to work. They needn't have worried. The much-predicted "leisure age" promised by technology has not materialized. In fact, quite the reverse: people are working harder than ever. There is less leisure time and, most surprising of all, the very workers with the greatest bargaining power are choosing to work the hardest. The problem is the burnout of white- collar Britain. For over a century, the average number of hours spent working over a lifetime slowly declined in Britain. The historian James Arrowsmith has calculated that in 1856 our ancestors put in 124,000 hours over a 40-year working life and, by 1981, it was 69,000. There it remained for a decade, but in the early nineties it began to increase again. On average full-time British workers now put in 80,224 hours over their working life, and that figure rises to 92,000 for those on a 50-hour week, which is common among the self- employed, the skilled, and professional and managerial workers. Many are working the kind of hours that would have been familiar to factory workers in the middle of the 19th century. The only difference is that now it's the bosses who are more likely to be putting in the hours than those on the shop floor. Britain has followed a US model of all work, no play, in contrast to continental Europe. Full-time workers in Britain now work the longest hours in Europe an average of 43.6 hours per week compared with an EU average of 40.3. Even more marked is the difference in holidays between Britain and continental Europe; the UK has, on average, 28 days a year, well behind France with 47, Italy with 44 and Germany with 41. Add the difference in weekly hours and holidays and it amounts to the British working almost eight weeks a year more than their European counterparts. -

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Chemistry Senior High

黄色いマーカーのところなのですが、なんでNaHCO3とだけ反応するんですか?

解説 (b) フェノールフタレインのみが適している。 (c) メチルオレンジとフェノールフタレインの両方が適している。 (d) メチルオレンジとフェノールフタレインのどちらも不適である。 応用例題 31 NaOH と Na2CO の混合溶液の中和滴定 炭酸ナトリウムと水酸化ナトリウムの混合水溶液がある。 この溶液 25.0mLに指示 応用 159 薬としてフェノールフタレイン (変色域: pH=8.0~9.8) を加え, 塩酸標準溶液(濃度 0.100mol/L) で滴定したところ, 滴定値が13.5mL で赤色が消えた。 次にメチルオレン ジ (変色域:pH=3.1~4.4) を指示薬として加えて滴定したところ、溶液の色が黄色か ら赤色に変化するのに、さらに11.5mL 塩酸標準溶液を必要とした。 (1) フェノールフタレインの変色域までに起こる2つの反応の反応式をそれぞれ書け。 (2) フェノールフタレインの赤色が消えてからメチルオレンジの変色域までに起こる 反応の反応式を書けにさ (3) 溶液中の炭酸ナトリウムと水酸化ナトリウムのモル濃度を有効数字2桁で求めよ。 塩酸 HCI と炭酸ナトリウム Na2CO3 の中和反応 ● ●エクセル 第1 中和点 Na2CO3 + HCI → NaHCO3 + NaCl 第2中和点 NaHCO3 + HCI → NaCl + H2O +CO2 (1) フェノールフタレインの変色域までに, NaOH + HCI → NaCl + H2O Na2CO3 + HCI → NaHCO3 + NaCl の2つの反応が起こる。 ・・・反応 A ・・・反応 B ①二段階で中和反応 起こり, 反応 A 完了してから反応 が起こる。

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