K h2o= [H+].[OH-]=1,0.10-14=>[OH-]=1,0.10-14/1,0.10-3=1,0.10-11M
=>Pha thêm axit vào nước [H+], mà K không đổi => [OH-] => [H+] > [OH-]
=> MÔI TRƯỜNG AXIT LÀ MÔI TRƯỜNG TRONG ĐÓ:
[H+]>[OH-] hay [H+]>1,0.10-7M.
[$H^{+}$]=1,0.$10^{-3}$
=> [$OH^{-}$]= $\frac{1,0.10^{-14}}{1,0.10^{-3}}$= 1,0.$10^{-11}$
Vậy [$OH^{-}$] < [$H^{+}$] => Môi trường axit
Calli: hài wa. NL: Mod này hài wa.
Bài 1: Cho tam giác ABC cân tại A, các đường phân giác BD, CE ( D thuộc AC, E thuộc AB ) a) Chứng minh rằng ED song song với BC b) Chứng minh rằng BEDC là hình thang cân có đáy nhỏ bằng cạnh bên
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6. I'm sure you'll have no..............the exam a. difficulty to pass b. difficulties to pass c. difficulties passing d. difficulty passing 7. ................a hotel we looked for somewhere to have dinner a. Finding b. after finding c. having found d. we found 8.I.........English for four years now a.have learned b. am learning c. learned d. have been learning 9. I'll......................another time , Kevin a. keep pace with you b. keep you pace with c. be-kept up with you d. keep pace you with 10. Just keep on............what you like a. do b. did c. doing d. done 11. the guide encouraged the tourists....................the ? prado museum in madrid a. visit b. to visit c. visiting d. vistied 12. Shhh ! I hear someone................in the distance. Do you hear it too ? a. shout b.shouted c. to shout d. shouting 13. Are you looking forward.................on your cassation ? a. you go b.going c. to going d. to go
Bài 1. Cho đường tròn tâm O và điểm A ở bên ngoài đường tròn. Một cát tuyến qua A cắt đường tròn tại B, C phân biệt. Các tiếp tuyến của đường tròn tại B và C cắt nhau tại D. Đường thẳng qua D vuông góc với OA cắt đường tròn E và F (E thuộc đoạn DF). Gọi M là trung điểm của đoạn BC. Chứng minh: a. 5 điểm A, E, M, O, F cùng thuộc một đường tròn. b. AE, AF là các tiếp tuyến của đường tròn (O).
so sánh công thức mạch mắc Nối Tiếp và Song song
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I. Rewrite these sentences 1. I haven’t eaten this kind of food before. This is the first…………………………………………………………….. 2. My brother started working in that factory five years ago. My brother has…………………………………………………………….. 3. How long is it since they built the house? When………………………………………………………………………? 4. The last time she went out with him was two years ago. She hasn't ..................................................................................................... 5.We started living here in 1997 We have............................................................................................... 6.I last saw Minh six months ago. I haven’t.................................................................................................... 7.It’s three years since I last spoke to her. -I haven’t..................................................................... 8.I’ve never eaten this kind of cake. -I t’s ........................................................................ 9) We’ve never met such a famous singer before. - It’s the first time ___________________________________________ 10. .How long is it since you used the car? -When .......................................................................
Giúp mình đi ạ mình đang rất cần gấp lun ạ
Calli:Văng:< NL:Khi đang tl mà bị văng Thì kệ, làm tiếp tính sau Hnay đang vui vẽ cái cỏ 4,3 lá mà nó cứ shao shao:'>
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