Biết 2,24l khí CO2 (đktc) tác dụng vừa hết với 200ml dung dịch Ba(OH)2, sản phẩm là BaCO3 và H2O. a) Viết PTHH b) Tính nồng độ mol của dung dịch Ba(OH)2 đã dùng c) Tính khối lượng chất kết tủa thu được ( GIẢI KÈM CÔNG THỨC GIÚP MÌNH NHA^^)

IX. Read the following passage and write T (for True ) or F (for False ) It’s six o’clock in the evening. Many people are at home. They are having dinner. They are watching T.V. They are listening to music. But Mrs. Bich is going to the work. She’s a doctor and she works at night in the hospital. Today she’s late. The hospital is not in her neighborhood so she usually goes by car. Mrs. Bich is in her car now. She’s driving fast. She should slow down but she must be at work by six thirty. A policeman stops her. “ You are driving too fast !” he says. You are going to have an accident. It’s six thirty. Mrs. Bich is not at the hospital. She’s at the police station. Her car must stay there for fourteen days. …………… 1. Mrs. Bich is a night doctor …………… 2. She goes to work by motorbike …………… 3. She is late for work …………… 4. A policeman doesn’t keep her car …………… 5. She arrives at the hospital at 6.30

Nhaanh giúp em với ạ !!! 1. Rút gọn biểu thức ( x - 5 ) (2x + 3 ) - 2x ( x - 3 ) + x - 7 2. Phân tích đa thức thành nhân tử a) x^3 - 2x^2 - 4xy^2 + x 3. Tìm giá trị cảu x để biểu thức Q = x^2 - 2x + 7 có giá trị nhỏ nhất

mng giúp em với ạ 7h em phải nộp rồi ạ

III. Choose the best answer. 1. We had dinner ________ an Italian restaurant last night. A. on B. in C. from D. to 2. My school is ________ the post office and the hospital. A. between B. next C. on D. in 3. He rarely gets up early _________ Sunday morning. A. or B. and C. at D. from 4. Do you like tea _________ coffee for the breakfast? A. or B. and C. with D. more 5. The bank opens at 8.00 in the morning and _________ at 5.00 in the afternoon. A. closes B. finishes C. starts D. ends 6. Tom and Mary always _________ a winter holiday. A. has B. having C. to have D. have 7. In the painting, the girl ________ a hat. A. is wearing B. wear C. wearing D. to wear 8. We usually listen to the news ________ the car. A. on B. in C. from D. behind 9. How much ________ this shirt cost? A. is B. are C. do D. does 10. There aren’t _______ shops in my village, just a post office. A. any B. some C. a little D. a lot of

Nhờ mọi người giải giùm và tóm tắt giúp e ạ

Calli:" Đời vẫn đẹp dù thế nào!"

Giúp với mình đag gấp ạ Không mạng nha

I. Choose the best answer to complete each of the following sentences. 1. He is very good at drawing_____. He often draws his parents and friends. A. crayons B. landmarks C. galleries D. portraits 2. She can play some musical_____ such as guitar, piano or cello. A. instruments B. paintbrushes C. opera D. microphones 3. He_____ as a photographer. He likes ______ photos very much. A. plays/drawing B. writes/taking C. works/taking D. works/drawing 4. Physical education, music or art are the subjects in the secondary___ in Viet Nam. A. curriculum B. necessity C. consideration D. importance 5. Do you know the national ______ of Viet Nam? -Yes. It's Tien Quan Ca. A. composer B. anthem C. academic D. music 6. Some people should take notice of the main content in the discussion. They just talk about______ things. A. suitable B. central C. unimportant D. necessary 7. The puppeteers are _____ the puppets by their strings. A. controlling B. visiting C. appearing D. enjoying 8. She's looking to receiving the letter from her mother. A. on B. forward C. up D. for 9. Your paintings are _______ his. A. as beautiful so B. as beautiful as C. more beautiful as D. so beautiful than 10.Her paintbrushes are so old. Hers are ______ yours. A. as not new as B. not as new like C. not as new as D. not as new than 11. His knowledge of history of art is _________ours. A. the same as B. very same as C. like same as D. more same as 12. Their kind of music is ___ mine. A. different with B. so different to C. as different than D. different from 13. Some people think the band's rock and roll songs are very lively. They are __ some of their gentle old songs. A. the same as B. different from C. not as far as D. as much as 14. I love dancing, and my sister loves it, ________. A. so B.too C. neither D. either 15. He can't play the saxophone, and his brother can't __________ A. either B.neither C. so D. too 16. No one else in the class plays the guitar John. A. as well B. as far as C. so well as D. as soon as 17. The Brit School is the most famous arts school in Britain. A. performing B. performance C. perform D. performed 18. Jane is not her brother. A. more intelligent as B. intelligent as C. so intelligent as D. so intelligent that 19. Since the 1970s, the festival in Glastonbury has taken almost every year and has grown in size. A. part B. place C. note D. notice 20. He drives as his father does. A. careful as B. more carefully C. the most careful D. carefully as 21. Dong Ho paintings are made on paper with beautiful colors. A. traditional – nature B. tradition – natural C. tradition – nature D. traditional - natural 22. I’ll be there I can. A. sooner as B. no sooner as C. as soon as D. soonest as 23. My village is not it was ten years ago. A. the same as B. the same to C. same as D. the same 24. The villagers are they were years ago. There is no change at all. A. differently from B. not as friendly as C. as friend as D. as friendly as 25. Water puppetry in the 11th century in the villages of the Red River Delta of North Viet Nam. A. originated B. formed C. started D. began

giải giúp mình mấy câu trắc nghiệm vs ạ