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1)tỷ khối hơi của một hỗn hợp X gồm ốm và oxy so với hiđro bằng 18 a)xác định % về thể tích của X b)hãy tính khối lượng của mỗi khí có trong 1,44 gam hỗn hợp khí trên? 2)tỷ khối hơi của một hỗn hợp Y gồm oxy và ozon so với oxi bằng 1,1 a)xác định % về khối lượng Y b)hãy tính thể tích của mỗi khí (ở đktc) có trong 1,12 lít hỗn hợp khí trên 3)hỗn hợp khí A gồm ozon và oxi có tỉ khối hơi đối với hiđro là 19,2 a)xác định % về thể tích của A b) hãy tính khối lượng của mỗi khí có trong 3.84 gam hỗn hợp khí trên? 4)cho 4,48 lít (đkc)hỗn hợp khí X gồm NO,NO2 có tỉ khối hơi đối với oxi là 1,1875.Tìm khối lượng NO,NO2 có trong hỗn hợp

@Chị kunchan giúp em , mấy bạn dành slot cho chị ấy nhé I. Choose the word whose underlined part is pronounced differently from the others. (1,0pt) 1. A. rack B. math C. snack D. library 2. A. important B. library C. physics D. middle 3. A. late B. date C. bank D. cake 4. A. how B. house C. hat D. hour II. Choose the best answer from the four options given (marked A, B, C, or D) to complete each sentence. (2,0pts) 1. ….................is your family name? – It’s Nguyen. A. Where B. What C. When D. How 2. In ….............................we learn about books and write essays. A. Physics B. Math C. Literature D. History 3. Let’s ….............................to Huong’s house. A. come B. comes C. coming D. to come 4. She has…............................books than Linh. A. most B. many C. much D. more 5. They often…...........................hard on the farm. A. work B. to work C. works D. working 6. He….....................................a vacation next week. A. have B. has C. having D. will have 7. Hoa’s brother is a …............................ He repairs cars in a garage. A. journalist B. writer C. mechanic D. farmer 8. My birthday is …....................................July 15th. A. in B. on C. at D. from III. Choose the best sentence which is rewritten from the given one. (2,0pts) 1. That book is very interesting. A. What a interesting book! B. What a book interesting! C. What an interesting book! D. What interesting a book! 2. That house is expensive. But Mr. Ha’s house is more expensive. A. Mr. Ha’s house is not as cheaper that house. B. Mr. Ha’s house is not more expensive than that house. C. Mr. Ha’s house is the cheapest house. D. Mr. Ha’s house is more expensive than that house. 3. bookstores/ front/ park A. The bookstores is in front of the park. B. The bookstores are in front of the park. C. The park is front of the bookstores. D. The park are in front of the bookstores. 4. can/ tell/ how/ stadium? A. Can you tell me how to get to the stadium? B. Can you tell me the way how to the stadium? C. Can you tell me how to the stadium? D. Can me tell you how to get to the stadium? IV. Give the correct form of the verbs (2,0pts) 1. He always (get) .............................. up late. 2. Let’s (go) ................................ to the beach. 3. She enjoys (read) ............................ book. 4. They (listen) ........................................... to music now. V. Choose the word (A, B, C or D) that best fits each of the blank spaces. (1,0pt) The students of class 7A enjoy different ….(1)…. after school hours. Acting is Nga’s favorite pastime. She is a member of the school theater group. At present, her group …(2).. a play for the school anniversary celebration. Ba is the president of the stamp collector’s club. On Wednesday afternoons, he and his friends get together and talk …(3).. their stamps. If they have any new stamps, they usually bring them to school. Ba’s American friend, Liz, …(4)… him a lot of American stamps. 1. A. activity B. activities C. act D. action 2. A. rehearse B. rehearses C. to rehearse D. is rehearsing 3. A. with B. to C. about D. in 4. A. gives B. needs C. gets D. buys VI. Read the passage carefully then answer the questions. (2,0pts) Hoa’s father, Mr.Tuan, is a farmer. He works more hours than Tim’s father. He usually starts work at six in the morning. He has breakfast, then he feeds the buffalo and chickens and collects the eggs. From nine in the morning until four in the afternoon, Mr Tuan works in the fields with his brother. They grow some rice, but their main crop is vegetables. From twelve to one o’clock, Mr Tuan rests and eats lunch. At four in the afternoon, they come back home. Mr. Tuan feeds the animals again. Then he cleans the buffalo shed and the chicken coop. His work usually finishes at six. Four or five times a year when there is less work, Mr.Tuan takes a day off. He goes to the city with his wife. A farmer has no real vacations. 1. Where does Mr. Tuan work? ..................................................................................................................... 2. When does he feed the animals? ..................................................................................................................... 3. Do they grow vegetables in the field? ..................................................................................................................... 4. How many days off does Mr.Tuan take a year? .....................................................................................................................

@Kunchan + @hoangdiepltt giúp em nhé !!! I. Choose a word which underlined part has the different spelling with the others (1m) 1. A clocks B. pens C. rulers D. boards 2. A bread B mean C team D people 3. A bad B tall C sad D happy 4. A near B hear C read D year II. Choose the best answer for each of the following sentences (4ms) 1. Some students have portable CD players with small ………….. A. headphones B. cell phones C. telephone D. earphones 2. Hoa’s friend is interested ........... writing letters A. in B. on C. for D. at 3. American students take part ………. different activities at recess. A. on B. in C. at D. to 4. I am ………….. my math homework. A. do B. does C. doing D. to do 5. Her group is ……………… a play for the school anniversary celebrations. A. rehearsing B. playing C. doing D. talking 6. What’s your …………. subject, Lan? - I like History. A. favorite B. popular C. famous D. like 7. Her date of birth is ............ November tenth. A. at B. on C. in D. of 8. How ....... is it from the hospital to the bus stop? A. long B. high C. often D. far III . Read the passage carefully. Then answer the questions. (2.5ms) The Vietnamese students take part in different activities after school. Some students play sports. They often play soccer, table tennis or badminton. Sometimes they go swimming in the swimming pools. Some students like music, drama and movies. They often practice playing musical instruments in the school music room. They join in the school theater group and usually rehearse plays. Some are members of the stamp collector’s club. They often get together and talk about their stamps. A few students stay at home and play video games or computer games. Most of them enjoy their activities after school. 1/ Which sports do some Vietnamese students often play? ………………………………………………………………………………… 2/ Where do they go swimming? ………………………………………………….…………………………………………. 3/ Do some students collect stamps? ……………………………………………………..………………………………………… 4/ Where do some students often practice playing musical instruments? …………………………………………………………………………. 5/ Do Vietnamese students enjoy their activities after school? …………………………………………………………………………. IV/ Supply the correct form or tense of the verbs in the brackets. (2 ,5ms) 1. Why don’t you (go) ………………..go to the zoo? 2.The students (do) ………………… some experiments at the moment. 3. He enjoys (play) ……………………. the guitar. 4. Let’s (skip) ……………………… rope. 5. What about (rehearse) ………………. a play?

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