user-avatar
trucngan5928
1 năm trước
Một gia đình cần làm 1 ngôi nhà, họ cần thêm 740 kg vôi tôi nữa để hoàn thiện. Hỏi: a. Họ cần phải mua bao nhiêu kg vôi sống ? b. Họ phải có bao nhiêu lít nước để tôi vừa đủ lượng vôi sống trên ? ( Biết khối lượng riêng của nước là 1kg/l ) Hướng dẫn: áp dụng phương pháp giải BT tính theo PTHH, nên tính theo tỷ lệ về khối lượng: PTHH: CaO + H2O Ca(OH)2 Tỷ lệ klg: 56g 18g 74g x kg y kg 740 kg Giúp mình nhanh nhé Cảm ơn
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

V. Read the passage and answer the questions. Technology has advanced to the point where instant communication anywhere in the world is an everyday fact of life. Technology has improved, and has a positive impact on communication as a whole in many (26) __________ . It has increased the reliability of sending messages to others, made it easier to meet new people and keep (27) __________ touch with friends. Modern communication is handled by wireless signals, undersea cables, satellites and other (28) __________ technology, ensuring the fast delivery of messages and data to any locations. The accessibility of technology also means that you don’t need to be in any special locations like a post office or mail room to send a message; all you need is a cell phone. Online communication has (29) __________ the door to new ways of communicating with strangers and taking part in communities. Chat rooms, (30) __________ forums and dating sites let people meet each other and get to know more people without having to be there in person. Question 26. A. methods B. means C. forms D. ways Question 27. A. on B. out C. for D. in Question 28. A. important B. high C. simple D. basic Question 29. A. opened B. closed C. been opened D. been closed Question 30. A. channel B. discussion C. cyber D. media

I. Choose the word which has the underlined part pronounced differently from the rest. Question 1. A. recycle B. medical C. chemical D. athletic Question 2. A. pollute B. botanic C. contaminate D. economy Question 3. A. into B. history C. tiny D. disease II. Choose the word which is stressed differently from the rest. Question 4. A. national B. grammatical C. medical D. chemical Question 5. A. athletic B. historic C. dramatic D. classic Question 6. A. scientifically B. economic C. artistic D. scientific III. Choose the correct answer to complete each sentence. Question 7. Water pollution can put negative __________ on our health. A. contamination B. affects C. effects D. problems Question 8. A: How can light pollution __________ animals? B: It can make animals change their behavior patterns. A. cause B. make C. affect D. lead Question 9. The dove is a universal __________ of peace. A. symbolizing B. symbolize C. symbolic D. symbol Question 10. The city has an atmosphere which is quite _______. You will never feel like that in other places. A. important B. normal C. unique D. common Question 11. __________ about the storm that stroke Hanoi last night? A. Did you hear B. Do you heard C. Have you hear D. Did you heard Question 12. Many people __________ because of the earthquake last week. A. did injure B. injured C. have injured D. were injured Question 13. When I looked at the river, I knew it __________ for a long time. A. had contaminated B. had been contaminated C. was contaminated D. contaminated Question 14. All flights to Ha Noi had to be cancelled __________ the storm. A. as a result B. due to C. because D. so Question 15. When we were young, we __________ in the river near our home. A. used to swim B. have swum C. had swum D. were swimming Question 16. Our coffee is a very products in the international market due to the high quality and the reasonable price. A. competition B. compete C. competitor D. competitive Question 17. We both admired his in helping other people. (generous) A. generous B. generously C. generosity D. more generous Question 18. The dress was , so I did not have a look on it. (attract) A. attraction B. unattractive C. attractive D. attracted Question 19. He _______ with most of the people in last night's face-to-face meeting. He was so talkative. A. Communicated B. communicating C. communicative D. communication Question 20. They were very surprised when they knew his . A. nation B. national C. nationally D. nationality

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team