Mn ơi giải hội mk 50 câu trắc nghiệm này nha!

Trong phòng thí nghiệm giả sử chỉ có: dung dịch KOH, khí CO 2 , cốc thủy tinh chỉ có một vạch chia, pipet, đèn cồn, giá thí nghiệm. Hãy trình bày hai phương pháp pha chế dung dịch K 2 CO 3 ?

Ghi toàn bộ từ vựng ở unit 19 sách hack não 1500 dàng cho những bạ có sách hộ tui vs, cần gấp nha.

Một trường tổ chức cho khoảng từ 700 đến 1200 học sinh đi tham quan. Nếu xếp 30 em hay 45 em vào 1 xe thì đều thiếu 5 em, đủ còn xếp 43 em vào một xe thì vừa đủ. tính số học sinh đi thăm quan

an act of great generosity? 1. ______ an opportunity to be creative? 2. ______ learning to be more independent? 3.______ something that was in shot supply? 4.______ regret at what may have been missed? 5. ______ something which is no longer available? 6. ______ someone who is unpredictable by nature? 7. ______ someone who found something puzzling? 8. ______ being particularly close to a family member? 9. ______ enjoying the fact that something was difficult? 10. ______ his/her intention to act differently from a parent? 11. ______ purchasing something which changed his/her life? 12. ______ getting in touch with people who could be of help? 13. ______ a way of making sure that he/she did not leave anything out? 14. ______ someone else making a decision with his/her wellbeing in mind? 15. ______ CHILDHOOD MEMORIES A. COLIN When I was eleven years old, my dad inherited quite a large amount of money from a distant relative. It was typical of him that he decided to use the money to take a whole party of local kids to Disneyland in Florida for three days. Fortunately, I was able to go as well, which was tremendous. In those days, you had to buy tickets for each ride and so we made a checklist of them all and ticked them off one by one until we’d been on every one. They still had a donkey train a canoe ride back then. My friend Eric bought a funny hat with his name on the front and then kept wondering how, all over Disneyland, random people knew his name and kept saying, “Hi Eric!”. My family will never let me forget how I ordered bowl of potato chips on room service at the motel, which cost them a staggering $20. They were good chips, though! B. MARILYN Most teenagers’ parents have normal jobs, you know like working in an office or being part of a company, but not my mom. She lives for her work and makes spur-of-the moment decisions. When I was a teenager, it almost felt as if I was the parent and she was the child, as I tried to tall her out of whatever her latest scheme involved. You see, my mum’s an archaeologist. She travel round the world finding exciting things in old ruins, and because she was always on the move, so was I! Sometimes I used to wonder if we’d ever settle down and lead a normal family life, but we never did, which is a shame really. Of course, now I’m going to make sure that I don’t do the same to my daughter. C. JEREMY I suppose being twins, my brother and I were always regarded as a single unit and, we did do everything together. From an early age; we were into inventing things, especially things which exploded like rockets, although I don’t ever recall any actually leaving the ground. We were keen on Maths at school and bought a computer when we were eleven years old. It was the best time for getting computers because there was very little software about in those days, so if you wanted to make the computer do anything, you had to write it yourself. Before long we were selling the stuff we’d written to software companies. I don’t think we knew how to turn our interest into money at that stage, having no commercial experience. But we soon found plenty of people who did know, but who couldn’t handle the technical side. We haven’t looked back since. D. TANYA When I was a teenager, my parents used to send my brother and me off on a week-long summer activity camp each year. Actually, we went to the same place five years running. I think it was because they wanted us to do something outdoors rather than have us sitting in front of a computer screen at home. And it was certainly challenging, if you consider we learnt to do things like climbing and caving. It wouldn’t suit all kids, but for us it was great. We found out how to fend for ourselves and we met lots of people from around the world. I’m still in touch with some of them by e-mail even now. Looking back, I guess it cost my parents a lot of money, but as far as I’m concerned it was a good investment because it really broadened my horizons.

Hai người xuất phát từ A cùng lúc đi đến B cách A 2500m người thứ nhất đi không nghỉ với vận tốc 36km/h người thứ 2 đi với vận tốc 12m/s trong thời gian 25s rồi nghỉ 10s sau đó chuyển động về B với vận tốc v biết người thứ nhất đến B sớm hơn người thứ 2 là 105s. Tìm giá trị của v

2.Không dùng thuốc thử hãy nêu cách nhận biết các dung dịch sau đựng trong các lọ mất nhãn riêng biệt: HCl, MgCl 2 , NaOH

Complete the questions. Use What.... / Who.... / Where.... / How..... 1, .................. these oranges? 1.5 a kilo. 2, .................. your favourite sport? Skiing 3, ................. the man in this photo? That's my father 4, ................. your new shoes? Black GIÚP EM VS E CẢM ƠN TRC Ạ :))

1. Tìm x biết x ∈ Z a, (x - 1)/6 = -1/-2 b, 3/x + 2 = 5/2x + 1 c, 2x-1/3 = 3x + 1/4 2 .Tìm x,y ∈ Z a, x/2 = 4/y b, x/2 = y/5 c, x/3 = y/4

Có 6 lọ dung dịch được đánh số ngẫu nhiên từ 1 đến 6. Mỗi dung dịch chứa một chất tan gồm BaCl 2 , H 2 SO 4 , NaOH, MgCl 2 , Na 2 CO 3 , HCl. Người ta tiến hành các thí nghiệm và thu được kết quả như sau: Thí nghiệm 1: Dung dịch 2 cho kết tủa khi tác dụng với các dung dịch 3 và 4. Thí nghiệm 2: Dung dịch 6 cho kết tủa khi tác dụng với các dung dịch 1 và 4. Thí nghiệm 3: Dung dịch 4 cho khí bay lên khi tác dụng với các dung dịch 3 và 5. Hãy xác định số thứ tự của các lọ dung dịch trên và viết các phương trình hóa học đã xảy ra