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英語 高校生

英語 これの答えなんだと思いますか?解いてみたのですが答えがなくて自信がありません。15番の選択肢は①ago ②from now ③past ④in です。 答えだけでかまいませんお願いします🙇‍♀️

A frosty Novemper morning decorates the leafless trees to perfection. When I went up the hill, the white frost was sparkling, and the of milky mist hanging in the air. 6 trees arose on all sides. There were layers The frost has not yet taken to lingering* on the trees in the morning. The air was soon mild. When I went to plant a new tree just received from the nursery*, a gentle moistnes prevailed. Planting trees is pleasant work, encouraging I dug the hole, the soil moved easily beneath the spade, soft and damp. thought about the future, and especially 7 so when conditions are as favorable as this. The weak roots settle 9 into the loam and compost and bone-meal*, pressed into the pit that has been dug; and the infant" thing, little more than a twig, is magnified in the 10 into a handsome and graceful maturity. The village has responded readily 11 the urgings* to plant more trees. In various corners single saplings* are being installed; where more space is available, groups are being planted. A decision as to 12 is not arrived at without much discussion, opinion being split, in general terms, between decorative exoties which put on a great show of blossom and those less showy trees, unfortunately slower in growth, which are more 13 to the village scene. To my relief the latter choice has been preferred. My immediate contribution has been to plant on the grassy edge of the lane which passes my house. 14 there is no room_for anything tall, I chose a white hawthorn*, and as I set it in the earth I could picture it giving pleasure to people who will walk along this lane many years 15 long after I am dead. [注] linger「とどまる」、nursery「苗床」 loam and compost and bone-meal 「黒土(ローム)と堆肥と骨粉」 infant「未発達の」、urging「奨励」、sapling「苗木」、 hawthorn 「セイョウサンザシ」 問6 0 green 2 rich 3 bare fallen 6 問7 0 Below As ③ Though Above 7 間8 0 for 2) dark ③ pessimistic の optimistic 8 問9 0 up hard unresistingly with difficulties 9 問10 0 imagination 2 real ③ future の life 10 問11 0 for ③ to by 11 on 問12 0 the way of planting の what to plant ③ how to plant 0 plant or not 12 問13 の traditional 2 colorful ③ dangerous 0 against 13 問140 If As long as 3 Unless Since 14

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化学 高校生

解答あり 最後の(4)が分かりません、、、 答えは(3)6.4 (4)2.0×10^-4 です。

VPT II 炭酸 HECO3は2価の弱酸であり,次のように電離する。ここでK,, K2は各段階の電離定数である。 K= 4.0×10-7mol/L K, = 5.0×10-11 mol/L HCO3 H* + HCO3 HCO3 H+ + COg?- 2H+ + CO- で表される。 ーク 問4 HCO3 が完全に電離するときの反応式は HCO3 この電離式の平衡定数Kの値を, 単位を付して有効数字2桁で求めよ。 4.0×(0x5:0×10~" -20× [D e - 2-Dr() 図1は HECO3の水溶液に水酸化ヒナトリウムを加えていったときの滴定曲線であり, 図2はその ときの pH と物質(イオン) a,b,cの存在割合を表したグラフである。 問5 pH H2CD3 HCD3. C03 1.0 C a 0.5 7 X 0 - pH d mL 図1 図2 (1)図1で,Xの付近は水酸化ナトリウム水溶液を加えても, PHが大きくは変化していない。 この ように酸や塩基が少量加えられても PHの値をほぼ一定に保つはたらきを何と呼ぶか。 (2)図2のa,b,c はそれぞれ H.CO。 , HCO。-, CO3- の化学種の一つである。 bはどれか。 (3) 図2でaとbの存在割合が共に 0.5になる点( d )のPHを求めよ。ただしlog02=0.30 とする。 4)密閉容器に水と二酸化炭素を入れ, 圧力をかけて溶解させた。H:CO3の濃度が 0.10 mol/Lに なったときの水溶液の水素イオン濃度を, 有効数字2桁で求めよ。 化学種の存在割合

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