1,D
2,D
3,B
4,A
Đáp án:
Câu `1.D.` một đoạn bút chì.
Vì chì là chất dẫn điện.Các chất còn lại không dẫn điện
Câu `2.D` Lý thuyết
Câu `3.B`
Do có nhiều Electron tự do nên kim loại có thể dẫn điện tốt hơn
Câu `4.A`
Cho 38 gam hỗn hợp Na2CO3 và NaHCO3 tác dụng với 200 gam dung dịch HCl, snh ra 8,96 lít khí (đktc). Tính khối lượng mỗi muối trong hỗn hợp ban đầu.
Exercise 6: Combine each pair of sentences using a suitable compound word. 1. John went to the show. He forgot his wallet. 2. The team will play together. They will lose the game. 3. The class is quiet during the test. They will not pass. 4. We looked everywhere for my brother. We could not find him. 5. Kerry went to the woods. She went hunting. 6. John loves to watch the movie Transformers. He loves to eat popcorn. 7. One of the greatest sports is tennis. Tennis is not watched very much on television. 8. The dog must eat dinner on time. He will be hungry. 9. David likes to play baseball. He loves to play soccer too. 10. Amanda needs to study harder. She will not graduate this year. Exercise 7: Complete the sentences with conjunction: and, or, but, so. 1. We needed some food for the week, .................. we went to the supermarket. 2. Alan invested a lot of money in the business, .................. the business went bankrupt. 3. Doug didn’t understand the homework assignment, .................. he asked the teacher for help. 4. Susan thinks she should stay home and relax, .................. she should go on vacation. 5. The doctors looked at the x-rays, .................. they decided to operate on the patient. 6. Tom asked his teacher for help, .................. he asked his parents. 7. Jack flew to London to visit his Uncle, .................. to visit the National Museum. 8. It is sunny, .................. it is very cold. 9. Henry studied very hard for the test, .................. passed with high marks. 10. I would like to play tennis today, .................. I would like to play golf. Exercise 8: Match each clause in column A with a clause in column B then match those pairs with suitable compound words. No. A Opt. B 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. You can look at the clothes in the shop windows. I was tired, Mrs. Taylor is tall Learning geography is difficult It is raining heavily outside, The exercises are quite difficult, I don’t know whether to turn left, Do you want to sit next to Nam No one likes classmates who are lazy You didn’t win the prize, A. B. C. D. E. F. G. H. I. J. so I went home early. so we’d better postpone ourpicnic. and Lan? but I’m doing quite well. and slim. so better luck next time. or you can’t go in and buy them. or right to reach thedepartment store. but interesting. and mean. 1 – 2 – 3 – 4. – 5 – 6 – 7 – 8 – 9 – 10 – Exercise 9: Insert the given words in right positions and rewrite the correct sentence. (You can use “,”if necessary). 1. To make this hand-cut flower, you need paper scissors. and 2. Shall we play tennis watch TV? or 3. l will have an exam next week, I haven’t learned anything but 4. I have to work overtime I can’t feed the dog on time. so 5. We knocked at the door, no one answered. but 6. The weather is hot in summer, we wear light clothes. so 7. My father is a doctor my mother is a shop assistant. and 8. I have a toothache I must see a dentist as early as I can. so 9. I love collecting stamps dolls. and 10. The TV is on, nobody is there watching. but HELP ME! PLEASE. CAN YOU DO IT EARLY =(((
Đốt cháy hoàn toàn 10,6 gam hỗn hợp khí C2H2, C3H4 trong oxi. Đem toàn bộ sản phẩm qua dung dịch Ca(OH)2 dư thu được 80g kết tủa. a. Viết các phương trình phản ứng. b. Tính khỗi lượng của mỗi khí trong hỗn hợp.
Cho △ ABC có 3 góc nhọn nội tiếp đường tròng ( O ). 3 đường cao AK, BE, CD cắt nhau tại H. a) Chứng minh: Tứ giác BDEC nội tiếp b) Chứng minh: AD . AB = AE . AC c) Gọi I, K là trung điểm của BC, DE. Chứng minh: OA // IJ Câu c ạ
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Mong mọi người giúp mik một bài hình nha :)))))
em hơi ngu văn nên m.n giúp em với ạ , m.n giải hộ em câu 2 và 3 ạ em cảm ơn
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