Đáp án:
Giải thích các bước giải:
P2O5 + 3H2O ----> 2H3PO4
(r)
SO3 + H2O ----> H2SO4
N2O5 + H2O ----> 2HNO3
I. MULTIPLE CHOICE 1. I bought a lot of different gifts in a _________ . a. temple b. food stall c. restaurant d. souvenir shop 2. The family __________ an apartment next door to mine. a. moved b. arrived c. rented d. stayed 3. We stopped at a restaurant __________ a short time. a. in b. at c. on d. for 4. She ____________ some new clothes last week. a. buys b. will buy c. bought d. to buy 5. Most of Vietnamese people are very _________ . 6. famous b. important c. friendly d. comfortable 7. __________ to the office yesterday? a. Do you go b. Did you go c. Will you go d. Are you going 8. Peter _________ Xuan Huong Lake 3 days ago. a. visited b. visits c. visit d. will visit 9. MsNhung learned how _________ a sewing machine. a. uses b. used c. using d. to use 10. They ___________ anything at the restaurant yesterday. a. don’t drink b. didn’t drink c. aren’t drinking d. won’t drink 11. My brother __________ into a new apartment last Summer. a. move b. moved c. moves d. will move 12. What _________ 3 hours ago? a. do you do b. did you do c. will you do d. are you doing 13. When _________ he born? a. is b. are c. was d. were 14. Thanh’shobby is playing soccer. a. pastime b. activity c. sport d. subject 15. They arrived _________ home yesterday afternoon. a. in b. at c. to d. on 16. Hoa watched her neighbor _________ her dress. a. make b. to make c. making d. made 17. __________ is a person who lives near you. a. Hairdresser b. Neighbor c. Teacher d. Dressmaker 18. She ________ but it didn’t fit. a. tried it on b. tried it up c. tried on it d. tried it up 19. Hoa thinks that sewing is a _________ hobby. a. favorite b. friendly c. useful d. twenty 20. My brother returned home last night. a. arrived b. came back c. traveled d. visited II. READING a. Read the passage: Choose the word (A, B, C or D) that the best fits the blank in the following passage: 1/Hoa is writing a letter to her mom. She says that she is glad (1) ________ her parents were well. She is doing well at school now. At first, everything was strange and (2) ________ . But she is having a lot of fun at the moment. She hopes her parents (3) ________ Ha Noi after the harvest. She will show her parents (4) ________ the city. And she will tell her parents (5) ________ about her because she knows (6) ________to take care of herself. 1. a. hear b. to hear c. to hearing d. hearing 2. a. difficult b. different c. hard d. a & c 3. a. visit b. will visit c. visits d. visiting 4. a. around b. of c. at d. on 5. a. not worry b. not to worry c. worried d. to not worry 6. a. how b. what c. why d. who 2/ Teeth are important for chewing food and talking. Without teeth, we can only eat soft food. It will be hard for us (1) ________ without teeth. The food that we eat can affect our teeth. Too (2) ________ sugar can make acid. This acid begins to eat away the teeth. Cavities in the teeth are holes made by acid. Most children love cola drinks. One of cola (3) ________ ten teaspoons of sugar. So we should avoid kinds of food with lots of sugar. Another way we can take care of our teeth is by(4) ________ them. We should brush our teeth at least twice a day. Also, we must give our teeth special treatment by visiting the(5) ________ twice a year. We should look after our teeth carefully. I hope all of us(6) ________ know how to keep our teeth healthy and beautiful. 1. a. speaking b. speak c. to speak d. spoke 2. a. much b. many c. lots of d. plenty 3. a. have b. has c. is having d. had 4. a. seeing b. watering c. showering d. cleaning 5. a. doctor b. dentist c. engineer d. teacher 6. a. will b. could c. might d. would
Giúp mik câu 1 và câu 2 vs Ai lm đúng, nhanh nhất sẽ đc vote 5* và 1 cảm ơn
my brother grew a lot of trees in the garden chuyển sang câu bị động
Bài 17. Cho lăng trụ tam giác ABC.DEF. Gọi G, H, I, J, K lần lượt là trung điểm của AE, EC, CD, BC, BE. Chứng minh ba vecto AJ GI HK đồng phẳng
Câu 3: Đốt cháy hoàn toàn 25,2g sắt trong bình chứa khí. a. Hãy viết phương trình phản ứng xảy ra b. Tính thể tích không khí cần dùng để đốt cháy hết lượng sắt trên ( Biết rằng thể tích khí oxi bằng 20% thể tích không khí ) c. Tính khối lượng KClO3 cần dùng để khi phân hủy thì thu được một thể tích khí O2 (ở đktc) bằng với thể tích khí O2 đã sử dụng ở phản ứng trên
So sánh 2 số a , b € Z trong các trường hợp sau : a<0 , b>0. a<0,b<0và |a|> |b| a>0,b>0 và |a|>|b|
Đặt tính giúp mình nha 6,75:4,5
Viết 3 pthh trong mỗi pt đều có kim loại tác dụng với hợp chất sinh ra khí hidro
(29+65)+(346-29-6) Giúp ikkkkk vote 5s cho câu tl đúng
Anh chị làm cho em 2 bài này với ạ em cảm ơn ạ em hứa sẽ vote 5 sao đánh giá hay nhất ạ
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