Hòa tan hoàn toàn 20,7 gam hỗn hợp X gồm Al và Al2O3 bằng dung dịch HCl 7,3% (lấy dư 10% so với lượng phản ứng), sau phản ứng thu được 6,72 lít khí H2 (đktc). a. Viết các phương trình phản ứng xảy ra. b. Tính khối lượng dung dịch HCl đã dùng.
2x/x+1 + căny = -1 và 1/x+1 + 2y = 4 Giải giúp mk hpt này nhé =)))
Giúp minh cau nay minh cam ơn nhieu
Xe chạy một thời gian dài. Sau khi xuống xe, sờ vào thành xe, đôi lúc ta thấy như bị điện giật. Vì sao?
Hình ảnh bên mô tả cấu tạo bộ xương người. Các loại xương tương ứng với các số (1), (2), (3) lần lượt là: A: xương thân, xương đầu, xương chi. B: xương đầu, xương chi, xương thân. C: xương chi, xương đầu, xương thân. D: xương đầu, xương thân, xương chi. Giải thích
m.n giúp tui vs huhu cho hàm số y=f(x)=2 phần 3 x -1 phần 2 a. tính f=-3;f(3 phần 4) b. tìm x biết f x =1 phần 2 c. trong các điểm sau điểm nào thuộc đồ thị hàm số??? A. (3 phần 4 ; -1 phần 2) B.(0,5 ; -2) pleas ae
Every time Parkas sees a movie made in India,he ........ Homesick. A will feel. B felt. C feels. D is feel ling
Đốt hoàn toàn hỗn hợp 5.6g cacbon và lưu huỳnh cần 6.72 lít khí ooxxi (đktc). a. viết pthh b.Tính khối lượng % khối lượng mỗi chất trong hỗn hợp
giúp mik với ạ.Gấp lắm 1/Remeber to ...strictly at the swimming pool. 2/.....does your father like?- he like tennis. 3/Hoa... 3 goals to my team and he made it a hat trick
I. Choose the word A, B, C or D which has the underlined part pronounced differently from the others. (1 pt) 1. A. recycle B. collect C. cooking D. electric 2. A. morning B. forget C. pork D. forty 3. A. game B. arrange C. skate D. cake 4. A. help B. benefit C. elderly D. garden ¬II. Choose the best answer A, B, C or D to complete each sentence. (1,5 pts) 1. I do not have _____ oranges, but I have _____ apples. A. some/ some B. some/ any C. any/ some D. any/ any 2. The Japanese eat a lot of fish and healthy food, _____ they live longer. A. so B. because C. or D. but 3. Hoa loves _____ outdoors with trees and flowers. A. to be B. be C. been D. being 4. Mozart was one of the most famous _____ of classical music. A. actors B. composers C. artists D. makers 5. _____ kilos of chicken do you want? A. How much B. How many C. How often D. How far 6. Before moving to Ha Noi, my parents _____ in Hai Phong. A. lived B. have lived C. live D. living ¬III. Give the correct form of the verbs in brackets to complete the following sentences. (0,5 pt) 1. Linh is my close friend. We (know)…………………. each other for five years. 2. We (clean)………………………up the dirty streets in our area last Sunday. C. READING: I. Fill in each blank with one suitable word from the box.(1 pt) created his childhood why most Chaplin was born in London on the 16th of April, 1889. He spent his (1) ___________ in poverty and hardship. In 1910 he began to perform pantomime in the United States. He first appeared on screen in 1914. He (2) ______________ his world-famous character, the Tramp, and he played this classic role in more than 70 films during (3) ______________ career. He also composed background music for (4) _____________ of his films. Chaplin died on the 25th of December, 1977, at his home in Switzerland. II. Read the passage below then answer the questions. (1 pt) The average lifespan of the Japanese is 78 for males and 85 for females, the longest in the world. The main secret lies in their food. The Japanese eat a lot of tofu, which is made from soybeans. Tofu contains a lot of vegetable protein, calcium and Vitamin B. It doesn’t contain much fat, and it doesn’t provide many calories. Seafood and vegetables play an important role in their diet, too. They cook the seafood with less cooking oil and less time. For each meal, they have more dishes on the table than us but they eat only a little of everything, never stuffing themselves. 1. What is the average lifespan of the Japanese? ________________________________________________________________. 2. What is tofu made from? ________________________________________________________________. 3. How do they cook the seafood? ________________________________________________________________. 4. Do they eat a lot of everything? ________________________________________________________________. D. WRITING: I. Rewrite the second sentence in the way that its meaning stays the same as the first one. (1 pt) 1. What hobby do you like best, Mai? What __________________________________________________________? 2. The road was slippery, so they couldn’t drive fast. (because) They____________________________________________________________. 3. Thu is taller than Lan. (not as…as) Lan _____________________________________________________________. 4. I love country music. Hoa likes country music. (too) I _______________________________________________________________. II. Write a paragraph (60- 80 words) about a popular dish in Viet Nam. (1 pt) ……………………………………………………………..…………………………………………………………………………………………………………………………………………………………………..…………………………………………………………
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