Nêu hiện tượng và giải thích hiện tượng khi sục khí Clo vào dung dịch KI dư ( có pha hồ tinh bột)

Giúp mik với các cậu ô mik cần trc 4h30 nha

$cos^{2}$(A) - $sin^{2}$(B) = 2cosC Chứng minh rằng C là đỉnh của tam giác vuông

khái niệm, quy trình thực hiện, yêu cầu kĩ thuật của món xào là gì vậy hả các bạn giúp mình với

Cha ông ta đã dạy" "Uống nước nhớ nguồn". Hãy chứng minh rằng từ xưa đến nay, dân tộc ta luôn thực hiện tốt lời dạy ấy.

giải giúp mình bài này nhé cảm ơn nhiều.

https://img.hoidap247.com/picture/question/20200411/tini_1586595686080.jpg nhanh nha

Câu 8: đốt cháy hoang toàn126g sắt trong bình chứa khí O2

Một rạp hát đã bán 460 vé vừa hạng 2 là 190.000đ và hạng 1 là 360.000đ. Biết rằng số vé hạng 2 gấp 3 lần số vé hạng 1. Tìm số vé mỗi hạng.

HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I. Choose the correct answer A, B, C, or D for each of the gaps to complete the following text. ( Đọc đoạn văn và khoanh vào đáp án đúng) Sydney is the (1) of the state New South Wales in Australia. It is the largest, oldest, and perhaps the (2) beautiful city in Australia. Sydney has a population of 4.5 million. Its Harbour is one of the largest in the world, and famous (3) the Harbour Bridge and the Opera House. The streets in the city centre are narrow (4) many art galleries, restaurants, pubs, but the streets in Paddington are (5) and houses are big. 1. A. home B. site C. capital D. village 2. A. more B. most C. less D. fewer 3. A. with B. for C. in D. at 4. A. on B. at C. to D. with 5. A. narrow B. short C. long D. wide II. Read the passage, and then choose the correct answers. ( Đọc đoạn văn sau và khoanh vào câu trả lời đúng) Tokyo is the capital of Japan. In Tokyo, there are always too many people in the place where you want to come. People are very polite even when they often spend a long time on traffic jams. Tokyo is different from London when you want to walk to a place. During the day, most people travel to work by train. Tokyo people buy six million train tickets every day. Although they are usually crowded, Japanese trains are very good. They always leave and arrive on time. On a London train, everybody in a seat seems to be asleep whether the journey is long or short. The worst time to be in the street at night is about 11.30 when the nightclubs are closing and everybody wants to go home. 1. Tokyo is different from London because . A. it has a larger population B. it is a noisy city C. it is more difficult to walk to somewhere D. its people are friendly and more polite 2. When does the writer think the worst time to go into the street? A. When the nightclubs are closing. B. At 8.00 am. C. When the trains are full. D. At 11.30 am 3. What does the writer think of Japanese trains? A. They are very nice and comfortable. B. There are not enough trains. C. They often run late. D. They leave and arrive on time. 4. In London trains, every British in a seat . A. reads a newspaper B. looks like being asleep C. talks with other people D. looks out of the window. 5. Which statement is NOT true according to the passage? A. Most people in Tokyo travel to work by train. B. It is very difficult to go around in Tokyo. C. When Japanese people are on traffic jams, they are not polite. D. Trains in Tokyo are very good - they always leave and arrive on time.