Hỗn hợp Na và K tác dụng hết với H2O cho 22,4 lít khí h2 (dktc) và dung dịch B. Trung hòa dd B bằng dd HCl 0,5M rồi cô cạn dd thu được 13,3g muối khan a)Tính thể tích dd HCl đã dùng b) Tính %m mỗi kim loại

Mark the letter A, B,C or D on your answer sheet to indicate the option that best complete each of the following exchanges. Question 23: John:“My first English test was not as good as I expected.” Jack: “-___________.” A. Good heaven! B. Very well, thanks. C. Never mind, better job next time D. How do you do? Question 24: Peter:“ Why don’t we wash our hands regularly to avoid coronaviruss?” David: “___________.” A. Thank you! B. Yes, let’s do that C. Not at all D. You’re wecome. Reading the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the questions from 25 to 29. Tigers are one of the most powerful and graceful animals in the world. The different species that still exist today, namely the Bengal, Indochina, Siberian, South China and Sumatra tigers are in danger of becoming extinct. Due to irresponsible hunting, the Bali, Caspian and Java tigers have already become extinct. This could soon happen to the other species too. In the past, tigers were considered as pets. With a smaller area to hunt, as man had taken up more of the land to build upon, the tigers found less area for themselves to hunt. They thus turned to farms to get their food. Farmers‘ livestock were attacked by these tigers. People were then encouraged to hunt and kill these animals with the promise of rewards. Even after the threat of tigers on livestock was over, man continued to hunt tigers, this time for recreation. Poachers hunt tigers for their body parts knowing that the skin of tigers is much bought after. Bones and other organs are also used as ingredients in traditional Chinese medicine. Although killing is illegal, it is still being carried out unless it is stopped, the remaining species of tigers will soon become extinct too. Question 25: How many species of tigers were there originally? A. three B. four C. five D. eight Question 26: There were fewer hunting grounds for the tigers because __________ A.man had occupied the land B. the farmers put their livestock there C. the tiger population was becoming bigger D. they liked hunting livestock Question 27: Man continues hunting tigers even they are no longer pets because A.he treats it as a form of recreation B. he loves tigers very much C. he still thinks tigers are pets D. he wants to make the tigers extinct Question 28: Poachers are people who _________ A.look after tigers B. make Chinese medicine C. hunt tigers illegally D. hunt tigers‘body parts Question 29: Illegal poaching will ________ A.cause the extinction of tigers B.increase the amount of Chinese medicine C.increase the amount of Chinese medicine D. increase the price of body parts

lm hộ mik nhanh nha ae mik cảm ơn ( nhớ giải thích nha ae )

Tìm vị trí điểm M để tổng diện tích hai hình vuông AMCD , BMEF đạt giá trị nhỏ nhất.

Câu 4. Một số tự nhiên có hai chữ số giống nhau, số này chia hết cho 2 và khi chia cho 5 có số dư là 3. Số có hai chữ số đó là : A. 88 В. 66 C. 44 D. 22.

mn ơi cho tớ hỏi , tại nguyên phân ,để tính số nst mà môi trường nội bào cung cấp tương đương với sô nst đơn là bao nhiêu thì dùng công thức a.2n(2^k-1) hay sao ạ ( lưu ý ở kì sau nha , tại tớ thấy kì sau có bộ nst 4n đơn í )

Vẽ bé mèo. NL:Ai nuôi bé mèo ko nek?Meooooooooooooooooooooo

tính nồng độ ion trong các dd : a, HNO, pH-4 b, H2SO4, pH-3 c, KOH, pH-9 d, Ba(OH)2, pH-10

chuyên gia tiếng anh giúp em vs khi lm ghi rõ công thức đầy đủ thiếu công thức báo mod xóa ráng chịu _____________________ ex2) cirle the best answer 11) My uncle's herd of cows (is / are) considered the best in the area 12) The Government (has / have) fallen and a general election will soon be held 13) The team ( is / are) trying on the new trainers 14) The pack of cards ( was / were) lying all over the drinking table 15) Whe the audience (has /have) kept silent the concert will begin 16) A team of plumbers ( was /were) playing against a team of carpenters 17) This class (is / are ) the best in the school 18) Many Hollywood stars ( walks / walk) gracefully on the red carpet 19) His fans ( scream / screams ) in excitement 20) Anne Hathaway and James Franco ( host / hosts) this year's Oscars

Exercise 1: Kết hợp câu dùng câu điều kiện 1. He can't go out because he has to study for his exam.  If ................................................................................................................................................................ 2. She is lazy so she can't pass the exam.  If ................................................................................................................................................................. 3. He smokes too much; that's why he can't get rid of his cough.  If ................................................................................................................................................................ 4. I can't play football this afternoon because I felt tired.  If ................................................................................................................................................................. 5. Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from the highway.  If ................................................................................................................................................................. 6. She can't be employed because she doesn't have a college degree.  If ................................................................................................................................................................. 7. She walked to the meeting. She was late.  If ................................................................................................................................................................ 8. Unless you promise to return back, I won't lend you.  If ................................................................................................................................................................ 9. We put off our trip because the weather was terrible.  If ................................................................................................................................................................ 10. Sally doesn't know what she has to do for homework because she was absent from school on Friday.  If .................................................................................................................................................................