Đáp án:
Giải thích các bước giải:nNaOH= 8/40=0,2(mol)
2NaOH + H2SO4 --> Na2SO4 + 2H2O
0,2 --> 0,1
--> mNa2SO4 = 0,1.142= 14,2(g)
`2NaOH + H_2SO_4 → Na_2SO_4 + 2H_2O`
`n_{H_2SO_4} = {3,6}/{18} = 0,2(mol)`
`n_{Na_2SO_4} = 1/2n_{H_2O} = 0,1(mol)`
`m_{Na_2SO_4} = 0,1 . 142 = 14,2(g)`
Cho hai danh từ sau: ngôi nhà, học sinh a) Hãy tạo thành cụm danh từ với mỗi danh từ trên. b) Đặt câu với hai cụm danh từ vừa tạo thành.
IV.Choose the best word or phrase (A, B, C or D) to complete each sentences. 16. Her children must wear their when they go to school every day. A. coat B. jeans C. uniform D. T-shirt 17. He’s a hard-working student.He usually learns by heart all new English at home. A. homework B. lessons C. vocabulary D. schoolbags 18. Her father is a(n) teacher.He often does some interesting experiments in front of his class. A. literature B. science C. English D. music 19. I am using my to draw a circle carefully in the art lesson at present. A. ruler B. notebook C. pencil sharpener D. compass 20. Nga and Mai are looking up some unknown words together on a paper in the library now. A. dictionary B. computer C. workbook D. map 21. You should put your warm clothes now because the weather is so cold. A. on B. at C. up D. away 22. He wants to be stronger,so he does every weekend morning. A. badminton B. football C. jog D. judo 23. I’m having school ____ with a bolled egg, some fried rice and some salads. A. day B. thing C. lunch D. ground 24. My brothers play ____ very skillfully. I hope I will play it well like them. A. piano B. the guitar C. karate D. the football 25. I regularly ___ jogging with my friends in the park. It helps improve our health. A. do B. play C. have D. go 26. Water ____ at about 100C. I learn about it from my previous physics lesson. A. boils B. boil C. is boiling D. are boiling 27. My mother and my sister ____ swimming twice a week. A. so B. goes C. are D. is 28. Look at him! He ___ morning exercise with his father. A. does B.is doing C. learns D. is learning 29. They usually pplay table tennis every afternoon, but today they ____ with their parents to prepare for the next exams. A. is studying B. study C. are studying D. studies 30. Their sister _____ alone at home now. She ____ with her friends in the park. A. is/is playing B. is/ isn’t plpaying C. isn’t/ isn’t playing D. isn’t/ is pplaying V. Choose the best response ( A, B, C or D) to complete each conversation 31. - How nice your schoolbag is! - _________________________ A. I bought it yesterday. B. Thanks a lot. C. It’s a present from my father. D. You’re welcome. 32. -Why are you interested in learning English? -__________________________ A. Because it helps me communicate with international frends. B. I think I’m very good at speaking English. C. I’m attending an English club. D. Because I’m studying in a boarding school. 33. -Would you like to go to the library? -____________________________ A. Not at all. B. You’re so kind,but I can’t go with you. C. Yes,reading books is my favourite hobby. D. Sorry, I can’t. I’m busy now.
Bài tập 2: Hiện nay, trong một số gia đình có tình trạng chồng ngược đãi, đánh đập hành hạ vợ. Trước tình trạng đó, nhiều người cho rằng đó là chuyện bình thường, là việc riêng của vợ chồng, gia đình người ta, không nên can thiệp. Em có tán thành quan niệm đó không? Vì sao? Bài tập 3: Em tán thành hoặc không tán thành với hành vi nào sau đây? Giải thích vì sao em đồng ý hoặc khô
Tính giá trị các biểu thức sau : 1, A = 1 + 3 + 3^2 + 3^3 + ..... + 3^2020 2, B = 6^2 + 6^4 + 6^6 + .... + 6^1010 3, C = 1 - 2 + 2^2 - 2^3 + ..... - 2^2011 + 2^2012 4, D = -2 + 2^2 - 2^3 + 2^4 - ..... - 2^2019 + 2^2020 Mình sẽ vote cảm ơn và bình chọn câu trả lời hay nhất cho bạn nào trả lời nhanh và chính xác nhé
Mọi người giúp mình bài khoanh này với ,mình hứa sẽ vote đầy đủ
Tìm lỗi sai và sửa lại cho đúng 1. Whether he approves of our plan or not, it will depend on what impression we make on him A. of B. or not C. it will D. on him 2. I stopped smoking because the doctor had told me that i should give it up if i want to be healthy. A. smoking B. had C. should D. want to be 3. For my mind, the whole affair is something of a mystery, isn't it? A. For B. whole C. of a D. isn't it
11 phần 11 viết mỗi phân số sau dưới dạng thương và tính giá trị của thương
Đề: Fill in the blank with the correct form of the given work 1) Eating...without being treated possiby cause a number of long-teem problems for your health. (Order)
hình thang có đáy lớn hơn đáy bé 20,4 dm và bằng 5/3 đáy bé , chiều cao hơn đáy bé 2,1 dm.tính diện tích hình thang.
I.Choose the word (A, B, C or D) whose stress is different from the others. 1. A. ready B. about C. heavy D. borrow 2. A. forgot B. early C. physics D. lesson 3. A. uniform B. exercise C. bicycle D. excited 4. A. canteen B. healthy C. rubber D. textbook 5. A. evening B.badminton C. already D. favourite II.Choose thev word (A, B, C or D) whose underlined part is pronounced differently, 6. A. rubber B. compass C. hungry D. notebook 7. A. borrow B. homework C. potato D. vocabulary 8. A. come B. poem C. going D. follow 9. A. other B. Monday C. brother D. closer 10. A. judo B. mother C. open D. postcard III.Choose the correct form of the words (A, B, C or D) to complete the sentences. 11. He is studying English in a(n) centre.There are a lot of foreign teachers and modern teaching devices there. A. internationally B. nation C. nationally D. international 12. His sister wrote an essay very .She received a good mark for it. A. creatively B. creating C. creative D. creation 13. My brother is very good at .He likes studying in the laboratory school. A. physical B. physically C. physics D. physicist 14. My sister often goes with my brother at the weekend. A. shop B. shopping C. shopped D. to shop 15. Tom’s father bought two for him and his brother to support their studying maths. A. calculated B. calculators C. calculating D. calculator
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến