Đốt cháy hết m gam cacbon trong oxi thu được hỗn hợp khí A gồm CO và CO2 . Cho hỗn hợp khí A đi từ từ qua ống sứ đựng 23,2 gam Fe3O4 nung nóng đến phản ứng kết thúc thu được chất rắn B chứa 3 chất ( Fe, FeO, Fe3O4 ) và khí D duy nhất. Hấp thụ hoàn toàn khí D bởi dung dịch Ba(OH)2 thu được 19,7gam kết tủa và dung dịch X. Đun nóng dung dịch X thu thêm 14,775 gam kết tủa nữa thì kết thúc phản ứng. Cho toàn bộ chất rắn B vào dung dịch CuSO4 dư, sau khi phản ứng xảy ra hoàn toàn thì lượng CuSO4 đã phản ứng là 0,03mol, đồng thời thu được 21,84g chất rắn E. a) Viết phương trình hóa học xảy ra b) Tính m và tỉ khối của A so với H2

Viết calli Phạm Đức Minh 1 pic kí 1pic ko kí ) Chụp sáng Tradi nhé

Put the following into the passive voice Alo help tui nha :D pleas

x^2-2mx+m-1=0 @ tìm giá trị của m để đt d cắt (p) tại 2 điểm phân biệt A(x1,y1) và B(x2,y2) thỏa mãn 2x1+2x2+y1y2=0

Làm giúp mình với ạ, mình cảm ơn nhiều :> By using the words in brackets, join each of the following sentences into logical ones. You may need to change some of the words. 1. A student has studied English for a few years. He may have a vocabulary of thousands of words. (who) =>.... 2. Between formal and colloquial English there is unmarked English. It is neither so literary and serious as formal English nor so casual and free as colloquial English. (which) =>... 3. He bought a jeep. His friend advised him against it. (although) =>..... 4. Good writing requires general and abstract words as well as specific and concrete ones. It is the latter that make writing vivid, real and clear. (though) =>.... 5. It was raining hard. They could not work in the fields. (so ... that) =>..... 6. The politician is concerned with successful elections. The statesman is interested in the future of his people. (whereas) =>.... 7. The results of the experiment were successful. The school refused to give any help. (although) =>.... 8. He chose to study computer science. Computer science has good employment prospects. (because of) =>.... 9. Mary walked very slowly. She did not catch the train. (if) =>..... 10. He is not coming. The meeting will be put off till next week. (in the event of) =>....

cho đoạn thẳng BC cố định có độ dài bằng 2a (với a>0 ) và một điểm A di chuyển sao cho góc BAC =90 độ. Kẻ AH vuông góc với BC tại H. Gọi HE và HF lần lượt là đường cao của tam giác ABH và tam giác ACH a, Chứng minh BC^2= 3.AH^2 +BE^2 +CF^2 b, tìm điều kiện của tam giác ABC để tổng BE^2 + CF^2 tạo giác trị nhỏ nhất

Cho mk hỏi ngôi thứ nhất câu chuyện mang tính chủ quan hay khách quan vậy . Cụ thể là Bác Ba trg bài Chiếc Lược Ngà

I. Subject or object form? Put in the pronouns. 1. There’s no need to shout. I can hear you . 2. You and I work well together. _____________________ are a good team. 3. We’ve got a bit problem. Could ________________ help ________________, please? 4. John’s two years younger than Alice, but ___________ is nearly as tall as ______________. 5. This is a good photo, isn’t ______________? ~ Is Jessica in ________? ~ Yes, that’s __________. Look, ___________ is next to Andrew. 6. Who did this crossword? ~ ______________. I did ______________ this morning. 7. Is this Nicky’s bag? ~ No, ___________ didn’t bring one. It can’t belong to ______________. 8. ______________ am looking for my shoes. Have ______________ seen ______________? ~ Yes, ______________ are here. 9. What about Emily? ~ I expect ____________ will be there. And her brother. ______________ both came to the party. ~ Do______________ mean Jackson? I don’t like ______________ very much. 10. Are Rita and Richard coming to the party? ~ We’ve invited ______________, but ______________ isn’t sure ______________ can come or not.

Part I. Find the word whose underlined part is pronounced differently from the rest. (0,5pt) C. through C. flower B. there B. poster 1. A. theater D. three A. local Part II. Choose the correct option (A, B, C, D) to complete each of the following sentences. 2. D. host (1,5pt) 1. The opposite of "historic" is ".. . ." А. еxpensive B. modern С. ехciting D. polluted 2. i .....that film many times. A. see B. saw C. am seeing D. have seen 3. My mother likes spending our summer holidays at the seaside .. . my father does, too. A. and В. or C. because D. although 4. We postponed our journey to the beach it rained. A. and B. but C. because D. or 5. In the future, we .. . the phone to learn English. C. has A. have B. will have D. had 6. We ......to use computers about 50 years ago. A. started B. will start D. start C. READING (2pts) I. Complete the postcard, using the word in the box. (Ipt) sun go white eaten having Dear Daisy, It is Nha Trang! I am all the time, and the beaches are so clean: blue sea and (2) is shining (3) sand! I have -(5) to .(1) a good time here! The ..(4) crabs today. They are delicious! Tomorrow I will Hon Tre Island. Wish you were here.

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