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Hoa12a6
2 năm trước
Trộn 3,175g Zn với 3,2g S và đem nung trong điều kiện không có không khí . Sau phản ứng lấy chất rắn cho vào dd HCl dư thì thấy có chất rắn màu vàng A không tan trong axit và khí B thoát ra. Làm khô chất rắn A cân được 1,6g , tỉ khối hơi của khí B đối với hidro là bao nhiêu?
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Các câu hỏi liên quan

I. Circle the correct answer (A,B,C or D) to complete each sentence. 1. She is ……… a bamboo basket for her uncle. A. weaving B. embroidering C. carving D. casting 2. I have been to many crafts villages in Vietnam, and I never cease to be amazed by the talents of local ……… A. souvenirs B. artisans C. products D. handicrafts 3. I enjoy living by the sea ………the weather is nice there. A. as B. so C. although D. when 4. You can ………these new words in the dictionary. A. take up B. turn up C. give up D. look up 5. The trouble with Stuart is that he never ………up on time for a meeting. A. turns B. gives C. arrives D. stays 6. The air is polluted ………the factories produce a lot of smoke. A. so B. since C. but D. or 7. Jimmy walked down the road without looking ………anybody. A. for B. up C. at D. after 8. Please put ………your hat before we go out. A. with B. up C. on D. down 9. Opened in 1937, the Golden Gate Bridge in San Francisco still ranks among the top 10 ………. bridge spans in the world. A. long B. longer C. mostly long D. longest 10. I don’t think I can ………to go to Canada for the conference. It’s very expensive. A. spend B. give C. afford D. enable 11. I was about to leave ………he arrived. A. if B. when C. before D. while 12. You need to concentrate and be ………; otherwise you’ll easily get distracted by other things and fail to complete your work with great quality. A. self-confident B. self-disciplined C patient D. generous 13. Due to personal ………, they are not friends any more. A. interests B. conflicts C. skills D. concerns 14. I’m behind all my work schedules. I’m really ………out. A. left B. stressed C. frustrated D. disappointed 15. If you like, I can ……… flowers on the cushion covers for you. A. grow B. make C. embroider D. knit 16. ……… she’s young, she’s the most famous artisan in the village. A. when B. although C. whereas D. in order to 17. I feel ………. I have nothing to do. A. bored B. confused C. tired D. angry 18. I asked Martha ………to enter law school. A. was she planning B. is she planning C. if she was planning D.are you planning 19. I wondered .............................the right thing. A. whether I was doing B. If I am doing C. Was I doing D. Am I doing 20. Someone was wondering if the taxi ……… yet. A. had arrived B. arrived C. arrives D. has arrived II. Phrasal verbs - Choose the best meaning of the words in italics. Circle A,B, or C. 1. Because of an accident, my train was held up for several hours. A. cancelled B. delayed C. checked D. continued 2. He no longer works here as a receptionist. He quit his job around three months ago. A. gave up B. looked up C. turned downed D. made up 3. “How much longer do we have to wait?” “I think we should wait five more minutes. He’ll arrive soon.” A. come up B. keep up C. catch up D. turn up 4. James has good relationships with everyone in the company. A. gets on well B. gets away C. gets up D. gets back 5. He rejected our school’s offer of employment, because he was offered a job in another school. A. broke down B. looked down C. turned down D. sat down 6. It took him six months to recover from his illness. A. go over B. get over C. take over D. look over 7. I hope to come back to New Zealand one day in the future. A. go B. visit C. return D. see 8. We’re running out of milk. Can you get some on your way home today? A. having a lot B. having no more C. needing some more D. needing less 9. Let’s log onto the website and find out what is on in Wellington. A. get information about B. share information C. post D. advertise 10. She’s looked throught the headlines with great interest. A. watched B. saw C. posted D. read III. Rewrite each of the following sentences so that the orifinal meaning stays the same. 1. Huy didn’t notice the sign. It was right in front of him. - Although the sign was ………………………………………………… 2. His father is too old, so he’s learning to run the family workshop. - Because his father ……………………………………………………………… 3. The moment she opened the letter, she burst into tears. As soon as she ………………………………………………………….. 4. I can’t wait to see my mother in Hanoi. - I’m looking …………………………………………………………. 5. She asked where to go for holidays. “Where should …………………………………………….?” She asked. 6. I don’t know what I should do in order to lose weight. - I don’t know what to ………………………………………….. 7. “I was very tired,” she said - She said she ……………………………………………………………………… 8. “Be careful, Ben,” she said. - She told Ben …………………………………………………………………… 9. Bob is younger than Sally. - Sally is …………………………………………………………………. 10. I didn’t spend as much money as you. - You spent …………………………………………………………………..

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