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nhoclun1m48
2 năm trước
Cho 13,7g hỗn hợp Mg và Zn vào dung dịch H2SO4 đặc , nóng , dư. Sau phản ứng, cô cạn dung dịch được 52,1g hỗn hợp muối khan. a. Tính khối lượng mỗi kim loại trong hỗn hợp đầu? b. Xác định V khí sunfuro sinh ra ở đktc? c. Nếu cho hỗn hợp trên tác dụng với dung dịch 200g dung dịch HCl 20%. Tính C% của các chất có trong dung dịch thu được?
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I. Circle the letter preceding the word that has the underlined part pronounced differently from the rest. (1pt) 1. A. hear B. near C. fear D. pear 2. A. gather B. monthly C. father D. brother 3. A. favorite B. slight C. fine D. high 4. A. cold B. hold C. close D. cloth II. Vocabulary and grammar. Circle the correct answer A, B, C, or D to complete each of the following sentences. (2 pts) 1. "________ a nice T-shirt, Hoa!" " Thank you". A. How B. What C. Which D. It 2." I've just received a present from my mother." A. Really B. Thank you C. Congratulations D. Well 3. He can't swim ________he is afraid of water. A. because B. but C. and D. so 4. At the weekend, we can play a________of badminton or join a football match. A. sport B. game C. match D. sporty 5. This is the________restaurant I have ever known. A. worst B. baddest C. badder D. worse 6. Many girls and women________ aerobics to keep fit. A. play B. went C. do D. go 7. __________eat too much salt. It's not good for you. A. Do B. Please C. Don't D. Can't 8. It's very__________to swim there. The water is heavily polluted. A. safe B. unpopular C. unsafe D. good 9. ___________the programme is late, we will wait to watch it. A. Because B. Although C. When D. So 10. As it doesn't snow in Viet Nam, we cannot __________skiing. A. make B. do C. go D. does III. Give the correct form of the verbs in simple past or present perfect. (2pts). 1) We (study)...............a very hard lesson the day before yesterday. 2) We (study)................................................almost every lesson in this book so far. 3) We (watch)..........................that television program. 4) We (watch).....................an interesting program on television last night. 5) My wife and I........................................(travel) by air many times in the past 6) My wife and I (travel).................................. to Mexico by air last summer 7) I (read)..................that novel by Hemingway sevaral times before. 8) I (read).........................that novel again during my last vacation. 9) I (have).........................a little trouble with my car last week. 10) However, I (have)......................... no trouble with my car since then. IV. Reading: Use the given words in the box to complete the following passage. There is ONE word you don't need to use (2pts) different some watch sporty go listening do play chatting (1)_____________students in my school are very (2)_____________. They take part in (3)_____________activities after school. Some students usually (4)_____________football, table tennis or badminton. Others (5)_____________swimming or jogging in the park. Some students don't like sports. They often go home and (6)_____________television. Sometimes, they like (7)_____________to music or (8)_____________on the Internet. V. Writing 1. Write complete sentences from the following sets of words and phrases. You can make all the necessary changes and additions. (3pts) 1. you / ever /have/ read / that / book / yet? -> ………………………………………… 2. The USA /in/ has / colour TV / 1953. -> ………………………………………… 3. The Eiffel Tower / most / famous building / Paris/is/the/in. -> ………………………………………… 4. Ngoc/has / never / been / to /Ho Chi Minh City / before. -> ………………………………………… 5. I have never eaten this kind of food before. (This is) -> ………………………………………… 6. This is the best novel I have ever read. (before) -> …………………………………………

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