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5.      Để điều chế được 280g CaO cần dùng bao nhiêu m(kg) CaCO3 biết hiệu suất phản ứng đạt 80%. Giá trị của m là
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4.      Hòa tan hoàn toàn m(g) Al2O3 cần dùng vừa đủ 200g dd H2SO4 29,4%. Tìm m?
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3.      Khử hoàn toàn 8g  một oxit kim loại hóa trị II bằng CO dư thu được kim loại và hỗn hợp khí Z. Ca(OH)2 dư thu được 10g kết tủa. Tìm công thức của oxit?
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2.      Hấp thụ hoàn toàn 5,6lit CO2 đktc vào 150ml dung dịch Ca(OH)2 1M thu được m(g) kết tủa. Tìm m?
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1.      Hấp thụ hoàn toàn V(lit) khí CO2 (đktc) vào bình đựng dd Ca(OH)2 thu được 15g kết tủa và dung dịch X. Đun nóng dung dịch X lại thu được 2,5g kết tủa. Tìm V?
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"Could you speak more slowly?" I asked the foreigner. *Câu trả lời của bạn    
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"Were you listening to music at 5 yesterday?" Laura asked Ann. *

 

 

 

Câu trả lời của bạn    
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16-17. 𝙈𝙖𝙧𝙠 𝙩𝙝𝙚 𝙡𝙚𝙩𝙩𝙚𝙧 𝘼, 𝘽, 𝘾, 𝙤𝙧 𝘿 𝙩𝙤 𝙞𝙣𝙙𝙞𝙘𝙖𝙩𝙚 𝙩𝙝𝙚 𝙨𝙚𝙣𝙩𝙚𝙣𝙘𝙚 𝙩𝙝𝙖𝙩 𝙞𝙨 𝙘𝙡𝙤𝙨𝙚𝙨𝙩 𝙞𝙣 𝙢𝙚𝙖𝙣𝙞𝙣𝙜 𝙩𝙤 𝙚𝙖𝙘𝙝𝙤𝙛 𝙩𝙝𝙚 𝙛𝙤𝙡𝙡𝙤𝙬𝙞𝙣𝙜 𝙦𝙪𝙚𝙨𝙩𝙞𝙤𝙣𝙨.Question 16. It is over twenty years since I last got in touch with them. *   A. I can’t help keeping getting in touch with them for over 20 years.   B. I haven’t gotten in touch with them for over 20 years.   C. I used to get in touch with them for over 20 years.   D. I have been getting in touch with them for over 20 years.Question 17. In spite of her tiredness, Lan tried to go to school to do a test. *   A. Despite she was tired, Lan tried to go to school to do a test.   B. Lan tried to go to school to do a test, she was tired.   C. Although she is tired, Lan tried to go to school to do a test.   D. Tired as she was, Lan tried to go to school to do a test.18-19. 𝙈𝙖𝙧𝙠 𝙩𝙝𝙚 𝙡𝙚𝙩𝙩𝙚𝙧 𝘼, 𝘽, 𝘾, 𝙤𝙧 𝘿 𝙩𝙤 𝙞𝙣𝙙𝙞𝙘𝙖𝙩𝙚 𝙩𝙝𝙚 𝙨𝙚𝙣𝙩𝙚𝙣𝙘𝙚 𝙩𝙝𝙖𝙩 𝙞𝙨 𝙘𝙡𝙤𝙨𝙚𝙨𝙩 𝙞𝙣 𝙢𝙚𝙖𝙣𝙞𝙣𝙜 𝙩𝙤 𝙚𝙖𝙘𝙝 𝙤𝙛 𝙩𝙝𝙚 𝙛𝙤𝙡𝙡𝙤𝙬𝙞𝙣𝙜 𝙦𝙪𝙚𝙨𝙩𝙞𝙤𝙣𝙨.Question 18. Jenny and Kathy are arranging to see a new film.- Jenny: "Why don't you come over and see the new film with me?"- Kathy: “_____” *   A. Great! I'd love to.   B. Oh, I'm afraid so.   C. You're welcome.   D. Wow! I didn't realize that.Question 19. Helen and Sarah are talking about their school's field trip.- Helen: "This is the best field trip we've ever had."- Sarah: "_____” Everyone enjoyed it to the fullest." *   A. I don't think that's a good idea.   B.. I totally disagree.   C. You're right.   D. Never mind.
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8-15. 𝘾𝙝𝙤𝙤𝙨𝙚 𝙩𝙝𝙚 𝙡𝙚𝙩𝙩𝙚𝙧 𝘼, 𝘽, 𝘾 𝙤𝙧 𝘿 𝙩𝙤 𝙞𝙣𝙙𝙞𝙘𝙖𝙩𝙚 𝙩𝙝𝙚 𝙬𝙤𝙧𝙙(𝙨) 𝙩𝙝𝙖𝙩 𝙗𝙚𝙨𝙩 𝙛𝙞𝙩𝙨 𝙩𝙝𝙚 𝙜𝙖𝙥 𝙞𝙣 𝙚𝙖𝙘𝙝 𝙤𝙛 𝙩𝙝𝙚 𝙛𝙤𝙡𝙡𝙤𝙬𝙞𝙣𝙜 𝙨𝙚𝙣𝙩𝙚𝙣𝙘𝙚𝙨.Question 8. My mother is often _____ last person to go to bed in my family. *   A. a   B. Ø   C. the   D. anQuestion 9. Someone was wondering if the taxi _______ yet. *   A. had arrived   B. arrived   C. arrives   D. has arrivedQuestion 10. John said he _______ her since they _______ school. *   A. hasn't met - left   B. didn't meet - left   C. hadn't met - left   D. hadn't met - had leftQuestion 11. Health experts strongly advise patients with hypertension to avoid food _______ amounts of fat. *   A. contained   B. containing   C. contains   D. is containedQuestion 12. Mary feels confident about the competition _____ she has been well-prepared for it. *   A. because of   B. because   C. although   D. despiteQuestion 13. The striker had already celebrated the goal, but the _____ decided that he had been offside. *   A. examiner   B. judge   C. referee   D. inspectorQuestion 14. It is very important for a firm or a company to keep _______ the changes in the market. *   A. pace of   B. track about   C. touch with   D. up withQuestion 15. If I _______ a million USD, I _______ that car. *   A. had – would have bought   B. have had – would buy   C. had had – would buy   D. had – would buy
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5-7. 𝙈𝙖𝙧𝙠 𝙩𝙝𝙚 𝙡𝙚𝙩𝙩𝙚𝙧 𝘼, 𝘽, 𝘾 𝙤𝙧 𝘿 𝙩𝙤 𝙞𝙣𝙙𝙞𝙘𝙖𝙩𝙚 𝙩𝙝𝙖𝙩 𝙪𝙣𝙙𝙚𝙧𝙡𝙞𝙣𝙚𝙙 𝙥𝙖𝙧𝙩 𝙩𝙝𝙖𝙩 𝙣𝙚𝙚𝙙𝙨 𝙘𝙤𝙧𝙧𝙚𝙘𝙩𝙞𝙤𝙣 𝙞𝙣 𝙚𝙖𝙘𝙝 𝙤𝙛 𝙩𝙝𝙚 𝙛𝙤𝙡𝙡𝙤𝙬𝙞𝙣𝙜 𝙨𝙚𝙣𝙩𝙚𝙣𝙘𝙚𝙨.Question 5. John's classmates l̲i̲k̲e̲ him s̲i̲n̲c̲e̲ he i̲s̲ friendly, honest, and k̲i̲n̲d̲n̲e̲s̲s̲. *   A. like   B. since   C. is   D. kindnessQuestion 6. The number o̲f̲ people w̲h̲o̲ (B) survived the Titanic s͟h͟i͟p͟w͟r͟e͟c͟k͟ in 1912 w̲e̲r̲e̲ quite small. *   A. of   B. who   C. shipwreck   D. wereQuestion 7. My sister s͟p͟e͟n͟t͟ a̲ l̲o̲t̲ o̲f̲ money i̲n̲ c̲l̲o̲t̲h̲e̲s̲. *   A. spent   B. a lot of   C. in   D. clothes