なぜ2になるのですか？ 立体異性体、光学活性体の数の求め方教えてください。

問10 2,3-dichlorobutane に関する記述のうち、正しいものはどれか。 ただし、配座異性体は 考えないものとする。 H H 1 CH 1 Y、立体異性体の数は3、 光学活性体の数は3。 2立体異性体の数は3、 光学活性体の数は2。 3、立体異性体の数は4、 光学活性体の数は4。 4立体異性体の数は4、 光学活性体の数は2。 5、立体異性体の数は4、 光学活性体の数は3。 C Cl HS 24 Sae R CH3 R し。CH3 s Br Br9-H HG Bト XYイ R エ エ

有機化学の問題です。答えは④になるのですが、水素の化学的環境の数え方が分からないので教えて欲しいです。 1枚目が問題で、2枚目と3枚目が解答になります。

模試 第2回 b 分子式C&H,4で表されるアルカンのうち、水素の化学的環境が2種類しか ないものの構造式として最も適当なものを,次の0~のうちから一つ選 べ。 21 HCP 〇○0-H0-0 0 CH-CH2-CH2-CH2-CH2-CH3 0HW-CH-COOCH HC) 00 HMOOHO 0 の CHs-CH-CH2-CH2-CHs CH'COMH -CH-COOM 3 CHs-CH2-CH-CH2-CH。 CH。 CHs 0 CHCO CHCOOW CH O CH。-CH-CH-CH。 a CH'COMH-CH-COCCH 1 CH。 CH。 HCK 1 CHs-C -CH2-CH。 CH。 -CH-COOCH 0 CHCL ○ CHCOOMH-CH-0

（2）を教えてください🙇‍♀️

Activity 4 Make a * temporary bed with cardboard Activity 5 Learn useful Japanese words and how to Activity 2 Experience earthquakes in a special car call 110 or 119;only for foreign people Tikari : Hello. Ms. Bell. We are 12:00~ Lunch(Try emergency food) going to have evacuation drills next Sunday. What should we do Schedule Opening Ceremony eters aayl o Date and Time Sunday September 1st 9:30~15:30 O Evacuation Place Tsubame Elementary School 9:30 Ken 10:00~ Activities Ms. 1 13:00~ Activities A Closing Ceremony 15:00 s. Bell: Evacuation drills? No. 5 Can anyone go? You can choose one activity at each time, Hik Activities en : Of course. Here is the Activity 3 Practice how to use an AED 0 Time 10:00~11:00 Ms. olo poster about the drills. We are going together. 1:00~12:00 O 0 O 13:00~14:00 10 14:00~15:00 lo (注) Would you like to come 10 口(1) with us? yun : We're going to meet at Midori Park at nine. If you come by that time, we co. together. eari :What shall we do for lunch? 15 :Well, Ill get some sandwiches at the convenience store on the way. 口に Bell: B Look at this. Let's try some emergency food. ari : Why not? Do you know what kind of food we can try, Ken? : No. Umm Cup Ramen? ri : No, I don't think so because 20 『n: Yes, it may be difficult after big natural disasters. Anyway, we will know on the do. :Ms. Bell, do you often have natural disasters in your country? Are they different+2 Bell: Yes, we do. I can only talk about my hometown, but from my experience CHID earthquakes are bigger here, I think. After I came to Japan, there was a bia earthquake. I was very surprised, and didn't know what to do. i: Then, why don't you do Activity 25 あ You have already experienced a at at TOTAL natural disaster, but you can learn how to protect yourself. 2ll: C I will do that. So, in the event, we can experience four kinds of activities. What are you going to choose? : Umm. Let's see. I'm interested in AEDS. I want to know what they are like. 30 : Oh, you don't know abóut them! They are used to save people's lives. : Of course I know, but I just wtant to try them because I've never touched them. :I took the course last year, but I'll try it again. II when we are in an emergency. 7:Iagree. Can all of us take part in the same activity together? 35 :I join the same activity with my family every year. This year we are going to learn how to make beds we can use in evacuation places in the morning. After that, I will be free. ;Tam going to help with the fire drills as a volunteer.

赤全部がどういうことかよく分からないので解説お願いしますm(_ _)m

→表4 O表4 ペンタン CH12 の異性体と沸点 (常圧) 近い。 接触面積が広いほどファ ンデルワールス力は大き くなり,分枝によって分 子どうしの接触面積が減 異性体 構造 沸点(℃) CH,CH.CH.CH.CH ペンタン 2-メチルブタン (イソペンタン) 36 CH。 28 CH-CH-CH,CHg 2,2-ジメチルプロパン (ネオペンタン) CH。 CH-C-CH。 CH。 10 少するとファンデルワー ルス力は小さくなるから 2-メチルブタンと2,2-ジメチルプロパンは, 慣用名でそれ ぞれイソペンタン,ネオペンタンともよばれる。 イソ(isc は同じという意味。 である。

比較級の問題です。 答えををおしえてください

(12) The older we grow, ( (13) The more Bob rowed the boat, ( (11) Sunlight is no ( )necessary to good health than fresh air. (b) more (a) less (C) much (d) little ) our memory tends to become. (a) the weak (b) so weak (C)) too weak (d) the weaker )he got. (b) the farther away (a) the more away ) the more farther away (d) the more far away (14) We have to get ( )as we can. (a) information as much (b) as much information (c) information as many (d) as many information (15) The computer's performance was ( ) better than expected. (a) much (b) more (C) most (d) very ) human beings as companions. (16) Dogs are often superior ( (b) than (C) more (d) to (a) from )as dead. (17) A man who stops learning is as ( (b) good (C) soon (d) far (a) much (18) She knows ( ) than to do such a stupid thing. (d) less (b) better (C) good (a) more

見にくいかもしれないですが、答えを確認したいので誰か教えてください🙇‍♀️

特殊構文 1 各文の空所に入る最も適切な語を選びなさい。 ) broke the window? ★1, Who( b, on the earth c, in world d, into the world a, m arnh ★ 2, This is the ( )book I have been looking for. b, very €, very much d, much more a, Tuch 3,“Why dida't you come yesterdayT" "But I ( )come" 3, do b, don't C, did d, does 4, twas becaus of the typhoon ( b,that )the train was delayed. d, why a, for €, what )was it that said such a foolish thing? €, Who ★ 5,( a, It b, Which d, Why 6,He wants1obeatcacher and ( a, 0Iwant b,0 Want I €, 0Ido d. o dol 7, Never ( )of seeing you here. b, dreamed I a, Idreamed C, did I dream d, didI dreamed 多, Hardly ( )her when 1 fell in love. a,Imet b, metI C, Ihad met d, had I met )sent this e-mail? a, Do you know who b, Do you think wto d. Do you think €, Who do you kaow 10,( )2t married to her? , Who do you know b, Who do you think €, Do you think who 11, You musta''t use a mobile phhone ( d. Do you know ) driving €, unless you 2, unless b, while d, while you 12, Beth rarely speaks unless ( b,speaking a, spoken 13, Ican hardily believe the ncws ( €, she speaks ) he lost the garne. d. she spoke a, which 14. Those who hust pandas in China are given severe punishment if b,what C, when d. that ,ey catch b. are caugha d, cauga 6, 2e caghe tem

最初の赤線で、炭素含有率が少ないほど燃やしたときにすすが多くなるってどういうことですか？ 二酸化炭素になる割合が多くなり、すすが少なくなると考えてはだめなんですか？ あと、炭素含有率を調べる式の立て方がよく分かりません。写真の赤線部分は何をしてるんでしょうか？

問6 33 正解6 実験IIより,イとウは燃焼試験の結果にほとんど差が ない。問5を考慮すると, イとウは(PE, PP)と考えら れる。PE, PP, PET, PS のうち, PS の炭素含有率 は92%で最大,PET の炭素含有率は 63%で最小である。 これよりPS の方が PET より、すすが多いと推測され る。よって, 実験IIより, エは PS, オは PET と考え られる。一? [参考] PS +ctte- CH 12 × 100 = 92% 13 PET o PS の C% * 100 CH f0-eM. 三 0-C- 5C C, H, O。 60 -×100 63% 96 PET のC% ×100 =

図形 2枚目の最後の部分、④⑤よりHBK=CHKになるというのがわかりません。。(その前までの比の関係はわかります) どなたか教えて下さると幸いです

数学I 数学A HC A1数学A 直角三角形HBC においてZHBC = 30° なので、BC =2|ア例である。一 第4問(選択問題) (配点 20) 方 ZMAC =Z は相似になる。した ABC 」なので、AMACと A| イ AABCにおいて, ZAは鈍角で, ZB= 30* である。点Cから直線ABに引 いた重線と直線 ABとの交点をHとする。辺 BC の中点を M とし、直線ACは 3点A, B. Mを通る円と点Aで接しているとする。 下の「ア]~ゥ 次のO~Oのうちから一つずつ選べ。 がって AC? = MC- ウ となる。M は辺 BC の中点なので |オ |クについては、最も適当なものを AC = エ21 CH が成り立つ。したがって/AHACは オ であり、ZAMB = カキ とな O 鋭角三角形 0 血角二等辺三角形 @ 二等辺三角形 る。 正三角形 @直角三角形 ACとHM の交点をK, 直線 BK と HCの交点をLとする。AHBK と ABCK の面積比は HL: LCであり、ACHK と ABCKの面積比は @ ABC 6 AMB O HMC AR ACHK:ABCK = HA @ MAB @ MCA また,M は辺BCの中点だから、 が成り立つ。 したがって AHAL/と AHBC の面積比は であ IK の面積は等しい。 Q AB @ AC ○ AM ゆえに,HL:LC = HA: O BC @ BH O CH 参考図 9:3 ケ H AHAL:AHBC = 1: となる。 fos L4519 (05 AC:MC - BAQ 45 o HA@HLきHB.He |M B 3 E Siと 82の面積化は ABを広面とみて MC =AC: 、あさの比り、 CE (数学I·数学A第4問は次ページに続く。) (80 -35 - 24 - (804-24) - 25 - (804-25) 2-16 = 2AC :2= HC. BC BC 2AC 30、 fo, b0 7:3 : 2 = 2HC

解ける方答えを教えて頂きたいです

When I waa just a little girl, I realized that my grandmother was a witch. ( 1)that time, was reading atories about Snow White and Sleeping Beauty and (ア) (nbout/1/that'a/witchen /learned/ where) My grandma was good to talk to. In many waya ahe waa your typical grandmother ahe atudied tai chi, and made pottery and quilta. But if ahe wants to fool me(2 ) believing ahe ia not a witch, ahe ahould get rid of her black cat. Only she can touch Satan,and that devil eat's green eyes are really Bcary. Anyway, over the yeara I got into the habit of going( 3 )to mee Grandma after school and telling her all my troubles, I never let her know that I knew her secret and ahe didn't sny anything(4)。 But when I was in my second year in high achool, I ran into a problem. It required a little magie to set right, so I thought I'd aak her straight out. “Grandma, are you a witch? 1 said. "Of course," she said. "I thought you knew." "Do you know how to cast apella and make potiona?" "wDepends," ahe said. "What's on your mind? Is ita love potion you need? "Tell me all about it, Amy" “Well," I said, "you know it's my Year 10 Formal in November, and nobody haa aaked me yet. Id really like to go with Stevo. You know him. He's always lived next door to us. But he goes out with all the popular girla at school and thinka ( 5 ) me as just hia siater." My grandma thought a minute then went into her bedroom. She came back and put a little bottle of red liquid in my hand. “This will fix him," she said. “How can I get him to take it?" “Oh, you're the one ( あ ) has to take it. Three sips are all you'll need. When will you see him next?" “He's coming to my house tomorrow after school." “When he comes, ask him in and take a sip of the magic potion. Then take your shoes8 off and go outside, and jump up and down the path for a minute or so on that pogo stick I gave you." “He'll think I'm crazy. I can't do that." “Do you want him to take you to the Formal or not?After that, come inside and take another aip. Then let that lovely hair of yours out of that ponytail, brush it for two minutes, and put a flower in your hair. After that sit on the floor and take the third sip." “Will that work? Hell think I'm crazy." “Just think positive," said my grandma, "And by the way, don't wear that old pair of jeana and that baggy shirt" Next day I was waiting for Stevo after school. I had on my new akirt and my new blouse. Iopened the door, still not sure if I'd be able to go through ( 6 )the plan. “Where are you off to?" he asked. "Anyway I can't atay long." “It'e OK,"I said looking at my watch. "Tve got plenty of time." And before I knew it I'd taken the first sip. It (4) (the medicine/abit/1/ike /used/tasted) to take when I wasa little ldd. “You sick or something?" he said. 1 just gave him my new Mona Lisa smile and kicked off my ahoes. "Juat a sec," I said. I picked n the pogo stick from the corner, went out the front door, and jumped up and down the path for a while. I saw Stevo looking out the window at me with ama puzzled expression. Iwent back inside and he said, "You all right?"

3行目 4行目 の所をまとめて、「円周角の定理から、」と書いても⭕️ですか？

id (2)△ADGと△BCHにおいて, w、m a sor.ns (S文)Sodbus -s. tgi仮定より,AD=BC…D ie tesh oemodvn ts baviems I 文 Mooe弧CGに対する円周角は等しいから, ZDAG=2CBH…·② (I文時) 半円の弧ABに対する円周角だから, ZBCH=90° …③ 1(8文 bgodp 1BC//FGより,平行線の同位角は等しいから, ZBCH=ZFDA…④ ③, ④より, ZFDA=90° ……⑤ nadzoqm 219l ortos pribnstersbruao 6より,ZADG=180° -ZFDA=90° ……⑥ bolil.8 ③, 6より, ZADG=ZBCH…① 0, 2, Oより, 1組の辺とその両端の角がそれぞれ等しいので, △ADG=△BCH 25