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어학/화학공부 2023. 7. 3. 08:05

친핵성 치환반응(S는 Substitution으로 치환을, N은 Nucleophilic으로 친핵성)은 두 가지의 메커니즘으로 진행될 수 있다. 1) SN2 : 이분자 친핵성 치환반응 → 결합 분해와 결합 생성 과정이 동시에 진행되는 경우 *2는 반응에 관여하는 분자의 수(종류) 1. 반응속도 v = k[RX][Nu:-] : 2차식 cf) i) 1step rxn(반응) ii) C+(탄소 양이온 중간체) 거치지 않음 (전이상태 거침) 2. RX (기질) CH3X > 1˚ RX > 2˚ RX > 3˚ RX 3. 입체화학 반전 (inversion) 4. 친핵체 용매 영향 큼 · 극성 양성자성 용매 : F- Cl- ..

어학/화학공부 2023. 6. 28. 10:34

강산 강염기

1. 강산과 강염기 1.1 강산의 정의: 물에서 거의 완전히(100%) 이온화되는 산 1.2. 강염기의 정의: 물에서 거의 완전히(100%) 이온화되는 염기 *물에서 100% 이온화된다고 가정( 이 때문에 강산(강염기)는 평형상수인 Ka, Kb 자료가 없다. ) 이로인해 강산, 강염기는 강전해질이며 이온화 반응식을 나타낼 때 “→” 화살표 사용함. 예) HCl(aq) → H^+(aq) + Cl^-(aq) 예) NaOH(aq) → Na^+(aq) + OH^-(aq) 2. 약산과 약염기 2.1 약산의 정의: 물에서 극히 일부만 이온화되는 산 2.2. 약염기의 정의: 물에서 극히 일부만 이온화되는 염기 ( 이온화되는 정도는 Ka, Kb로 나타낸다. ) 이로인해 약산, 약염기는 약전해질이며, 이온화 반응을 나타..

어학/화학공부 2023. 6. 28. 07:49

Entertaining a Guest 4

Comprehension Questions 1.Why is Speaker A buying Speaker B lunch? I’d like to treat you to something special because of all the hard work that you have been doing these days 2.Why does Speaker B want to give a 10% a client? B: Do you think we could give one of my clients a 10% discount because they have been with us for 10 years but our competitors are aggressively doubling down on stealing the..

어학/영어공부 2023. 6. 1. 07:26

Entertaining a Guest 3

Comprehension Questions 1.What recently happened at the production facilities? in detail there is no content in dialog but, speaker A tightly controlled and showed B will not worry about any more mistakes. 2.Did Speaker B do a good or bad job fixing the issues? Speaker B good job the issuese. They ve fixed all the problems. 3.What does Speaker B suggest at the end of the dialogue to help both of..

어학/영어공부 2023. 5. 31. 07:24

30

1. Stretch your legs, place them on a chair, and stretch your hamstring. 2. Fold your legs into 4 shapes to relax your pelvic muscles as much as possible 3. In the same position as lunge, place your knees on the floor and relax your front thigh muscles 3. Do it three times, five times each 1. 다리를 펴서 의자에두고 햄스트링을 스트레칭한다. 2. 다리를 4자로접어 골반근육을 최대한 이완시킨다 3. 런지와동일한 자세로하는데 무릎을 바닥이 대고 앞허벅지근육을 이완시킨다 3. 양다리..

어학/영어공부 2023. 5. 4. 07:09

영어수업 29

A: Welcome to Singapore! Due to COVID-19 issues, we have some red tape you must go through so I will have to ask you some questions. What is the purpose of your visit, business or pleasure? B: The purpose of my visit is to have a business meeting. I’m staying here for one month and I have all my documentation here so you can go over it to check. A: It says here that you got a negative result for..

어학/영어공부 2023. 5. 2. 22:05

영어수업 28

A: Okay Mr. Hong, here is your boarding pass and your passport. Did you have any bags to check? B: If I check my luggage, where should I pick it up? If it is too far out of the way, then I’ll just take it as a carry on . A: The baggage claim area is on the way out of the airport so it is very convenient. B: Great, then I have a bag to check. But the airline lost my bag last time, so is there som..

어학/영어공부 2023. 4. 25. 23:04

영어수업 27 - Choosing a Seat for a Flight

A: Hello, is this the airline? I am looking for a flight back home, but there doesn’t seem to be any available online. Could you check at your end ? B: Yes, this is FLY Airlines. Where are you flying to? A: I need a flight to Seoul as soon as possible. B: We have several seats available.Would you like a window or an aisle seat, sir? A: I will go for the first class window seat. I finally clinche..

어학/영어공부 2023. 4. 20. 01:39

영어수업 26 Booking a Flight Ticket

A: Hello, this is Air Pacifica, how may I help you? B: Hello, I got in touch with you because I’d like to book a ticket to the Maldives. A: Are you flying for business or pleasure? B: It is for business. I am so lucky that I get to go on this unforeseen business trip to such an amazing place and even get paid for it. Things like this happen from time to time but overall it is very rare. A: You a..

어학/영어공부 2023. 4. 17. 13:37

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