nSO3=1,8.10^23/6.10^23=0,3 mol
VSO3=0,3.22,4=6,72 lít
I/. Choose one word whose underlined part is pronounced differently from the others. 5 1. A. sure B. saw C. send D. sit 2. A. new B. sew C. few D. knew 3. A. image B. arcade C. take D. days 4. A. plays B. looks C. wants D. helps 5. A. decided B. preferred C. listened D. enjoyed 6. A. much B. drug C. buffalo D. future 7. A. horrible B. hour C. hundred D. hold 8. A. teenager B. together C. guess D. regular 9. A. languages B. goes C. watches D. dresses 10. A. education B. collection C. question D. celebration II/.Fill in each blank with the correct form of the word given in capital. ( 15 Points ). 1/. English is an ………………… and important subject INTEREST. 2/. In electronics they learn to repair ……………appliances. HOUSE 3/. The most popular ………….. at recess is talking . ACT 4/. Hoa is having a....................check-up MEDICINE 5/. In the countryside, people often know all the people in their.............. NEIGHBOR 6/. You must be careful when playing video games because they can be ………. ADDICT 7/. I’d like a nice..................orange JUICE 8/. Edison’s most famous ………. was the electronic bulb. INVENT 9/. This dictionary is very ..............for you to learn English USE 10/. I have ....................time to play than my friends LITTLE III/. Choose the best answer to complete each sentence.(5 points) 1/. I bought this dress at the...................on Hang Bai street. A. clothes’ store B. store of closes C. clothes store D. closing store 2/. Isn’t it easy to learn English well? - ……………………….. A. No, it is B. No it does not C. Yes, it is D. Yes. It does 3/. There are two churches in the town and ………………of them are extremely old. A. each B. all C. both D. most 4/. My joke made the whole class ……………… A. smile B. laughing C. laugh D. crying 5/. Mr. Nam ………………….. to work yesterday A. wasn’t drive B. not drive C. didn’t drove D. didn’t drive 6/. The news on TV last night ……………………. very good. A. was B. has C. were D. be 7/. Lan did not know the world . Hoa didn’t ……………………………. A. so B. neither C. either D. too 8/. The boss wants his ………………….. to type some letters. A. secretary B. novelist C. journalist D. musician 9/. If he eats all that food, he eats……………………… A. quite much B. too many C. quite many D. too much 10/. Mr Robinson speaks Vietnamese very…………………….. A. skillfully B. good C. fluently D. best IV/. Give the correct form of the verbs in brackets to complete the following sentences. (10 points) 1/. We can’t go out now because it (rain ) …………………… . 2/. They (meet) .......................their teacher at the moment. 3/. We (visit ) …………….the museum at the moment. We (visit ) …………..it once a year 4/. Hai ( not write ) ……………….. to her parents last week. She ( phone ) …..……. them. 5/.Duy ( not visit)… …the museum with his class last Sunday because he (catch ) .... a cold. 6/. How much it ( cost ) …………….to mail a latter to England? 7/. Take these pills and you ( feel ) ……………….. better then, Ha. V/. Each sentence below contains an error. Underline it and write the correct answer in the space provided ( 10 points ) 1. From at nine in the morning until four afternoon Mr. Tuan works in A B C the fields with his father. D 2. There is fewer work in the evening than there is in the morning A B C D 3. My Dad always has a three-weeks vacation. A B C D 4. Mr Ba soon got used to travel to work by bicycle. A B C D 5. The doctor says you should spend a little time to play video game. A B C D 6. The public library in the city has thousand of good books. A B C D 7. What does the new student like? - Oh, she is tall and beautiful. A B C D 8. Ba is in class 7A and he enjoys the school very much. A B C D 9. My father always has a lot of houseworks to do. A B C D 10. There is a ten-floors building in front of my house. A B C D
Đặt 3 câu có dùng dấu hai chấm: -1 câu dẫn lời nói trực tiếp:…………………………………………………….. -1 câu mang ý nghĩa liệt kê:……………………………………………………… -1 câu có ý giải thích:……………………………………………………........
Mọi người Giúp mình làm mấy câu trắc nghiệm toán này với ạ😊 mình đang cần câu trả lời gấp ạ
1. Our ferry departs / is departing for Amsterdam at 7 tomorrow morning. 2. What time do you meet / are you meeting Steve on Sunday? 3. After the reconstruction the supermarket opens / is opening on Monday again. 4. Do you have / Are you having your birthday party this week or next week? I forgot! 5. We hold / are holding a Science fair next weekend. There will be displays of students’ work. 6. When does the school end / is the school ending this year? 7. Mark and I play / are playing basketball after school today. Do you want to play too? 8. Kate phoned up. She comes round / is coming round to see us this weekend. 9. The Prime Minister arrives / is arriving in India on Tuesday and spends / is spending a couple of days in Delhi. 10. I’ve just phoned the centre and the doors open / are opening at 18.00.
Mọi người giúp mình phần btvn với nha
Giups mình làm với, khó lắm, bạn nào không biết thì đừng trả lời nhé. Nhanh lên nhé, mình đang cần. Mình mới vô nên không biết nhiều nên mong các bạn đừng trả lời linh tinh Bài 1: Làm bay hơi 60g nước từ dung dịch có nồng độ 15% được dung dịch mới có nồng độ 18%. Hãy xác định khối lượng của dung dịch ban đầu. Bài 2: Đun nhẹ 20g dung dịch CuSO4 cho đến khi nước bay hơi hết, người ta thu được chất rắn màu trắng là CuSO4 khan. Chất này có khối lượng là 3,6g. Hãy xác định nồng độ phần trăm của dung dịch CuSO4.
Cho phương trình -3x ² + 2 (m-1)x + 4m ² - 5m - 6 =0 (1) Tìm các giá trị của tham số m để phương trình (1) có hai nghiệm trái dấu Jup mình với ♥ Nhớ ghi cách giải nhá :))
Lm giùm mik nha mọi đang cần gắp
Anh chị giúp em với em đang cần gấp dạ cảm ơn
Đốt cháy hoàn toàn 2,24 lít (đktc) một ankin X, thu được 4,48 lít CO 2 (đktc). X tác dụng được với dd AgNO 3 /NH 3 . Tìm CTPT, viết CTCT và gọi tên thay thế của X.
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