1. Tính diện tích hình tròn có đường kính 15cm. 2. Hình hộp chữ nhật có số đỉnh là: A.7 B.8 C.6 D.9

Câu 1 (NB): Trong các dãy chất sau dãy nào chỉ gồm đơn chất? A. Fe(NO3)3, NO, C, S. B. Mg, K, S, C, N2. C. Fe, NO2, H2O. D. Cu(NO3)2, KCl, HCl. Câu 2 (TH): Trong nguyên tử hạt nào mang điện tích âm? A. Electron. B. Proton. C. Nơtron. D. Nơtron và electron. 2. Nguyên tử Câu 1 (VD): Nguyên tử nguyên tố X được cấu tạo bởi 36 hạt, trong đó số hạt mang điện gấp đôi số hạt không mang điện. Số hạt proton của nguyên tử nguyên tố X là A. 10. B. 12. C. 15. D. 18. 3. Nguyên tố hóa học – Công thức hóa học Câu 1 (NB): Công thức hóa học của hợp chất gồm 2 nguyên tử photpho và 5 nguyên tử oxi là A. P3O2. B. P5O2. C. P2O5. D. P2O3. Câu 2 (TH): Hợp chất natri cacbonat có công thức hóa học là Na2CO3 thì tỉ lệ các nguyên tử nguyên tố theo thứ tự Na: C: O là A. 2 : 0 : 3. B. 1 : 2 : 3. C. 2 : 1 : 3. D. 3 : 2 : 1. Câu 3 (VD): Từ công thức hóa học của hợp chất amoniac NH3 ta biết được điều gì? A. Có 2 nguyên tử tạo ra chất, chất do 2 nguyên tố là N và H tạo ra, phân tử khối bằng 17 (đvC). B. Chất do 2 nguyên tố là N và H tạo ra, phân tử khối bằng 17(đvC). C. Chất do 2 nguyên tố là N và H tạo ra, phân tử khối bằng 17 (đvC), có 1 nguyên tử 1N, 3 nguyên tử H trong 1 phân tử của chất.

viết đoạn văn 8-10 câu miêu tả 1 con vật nuôi trong nhà mà em yêu thích

THE WRITTEN TEST NO.2 ENGLISH 10 Time allowance: 45 minutes Full name: ………………………………………… Class: 10A4-7 Mark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. 1. A. cooked B. needed C. attracted D. defeated 2. A. request B. arrest C. honest D. invest Mark the letter A, B, C, or D to indicate the correct answer the following questions. 3. The _______ system of the body lets us break down the food we eat and turn it into energy. A. respiratory B. digestive C. circulatory D. skeletal 4. As planned, we_____________ our grandparents this weekend. A. will visit B. visit C. are going to visit D. is going to visit 5. Chores are __________ equally __________ the members of my family. A. divided/ between B. dividing/ between C. divided/ among D. dividing/ among 6. My mother _______________ the responsibility for running the household. A. holds B. takes C. runs D. bears 7. Lots of houses _______________ by the earthquake. A. are destroying B. destroyed C. were destroyed D. were destroying 8. Do you have to do______________________? A. the mess B. your bed C. the washing-up D. the cook 9. You should feel happy because your mum and dad always encourage you____ hard A. work B. to work C. worked D. working 10. The artist quickly became___ when her debut album gained Top 40 in a short time. A. famous B. reputed C. talented D. incredible Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions. 11. Three days ago, Mary asked her teachers give her some advice A B C D 12. My father usually watches TV after meal but today he listens to radio. A B C D 13. Besides acupuncture, acupressure are used to help treat ailments without any medicine. A B C D Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. 14. It is advisable that everyone in family shares the household duties. A. views B. ideas C. jobs D. chores 15. We always split the housework equally - my mom cooks, my dad cleans the house and I do the washing- up. A. share B. join C. pick up D. break Put the correct tenses of the verbs in the brackets. 16. Every day, Jane washes the dishes but today she (do) _____________ the washing - up. 17. A box full of chocolate (send) ________________to him yesterday. 18. Recently, her husband has made her (stay) _______________ at home. Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it. (0) has been done as an example. 19. They are building a new school here.

Exercise Exercise 1: Put the verb in brackets into the correct form (type 1) 1) If we...........(to send) an invitation, our friends...........(to come) to our party. 2) He...........(not/to understand) you if you (to whisper). 3) They...........(not/to survive) in the desert if they...........(not/to take) extra water with them. 4) If you...........(to press) CTRL + s, you...........(to save) the file. 5) You...........(to cross) the Channel if you...........(to fly) from Paris to London. 6) Fred...........(to answer) the phone if his wife (to have) a bath. 7) If Claire...........(to wear) this dress at the party, our guests...........(not/to stay) any longer. 8) If I...........(to touch) this snake, my girlfriend...........(not/to scream). 9) She...........(to forget) to pick you up if you (not/to phone) her. 10) I...........(to remember) you if you...........(to give) me a photo. Exercise 2: Put the verb in brackets into the correct form (type 2) 1) If you...........(to help) your grandma, I...........(to do) the shopping. 2) Andrew...........(to water) the flowers if he...........(to stay) at home. 3) If she...........(to have) 5 pounds more, she...........(to buy) herself this T-shirt. 4) If they...........(to offer) me the job, I...........(to take) it. 5) You...........(to have) summer holidays from June till August if you...........(to live) in the USA. 6) We...........(to sell) the bike for 20 Euros if Ron...........(to repair) it. 7) If you...........(to use) a pencil, the drawing...........(to be) perfect. 8) The children...........(to be) happy if he...........(to teach) them English. 9) If Ireen...........(to visit) us, we...........(to go) out tonight. 10) They...........(to come) again if he...........(to plan) a second stay. Exercise 3: Put the verb in brackets into the correct form (type 3) 1) If you.....................(to check) the car, it (not/to break) down in the middle of the desert. 2) If it...........(not/to rain), the children (to play) outside. 3) If my parents...........(not/to be) so tired, they...........(to watch) the film on TV. 4) If she...........(to buy) a new hard disk, she...........(not/to lose) all data. 5) If we...........(to use) the town map, we...........(not/to get) lost. 6) If Tom...........(to eat) more salad, he (not/to catch) a cold. 7) If the police...........(not/to stop) me, I...........(to reach) you in time. 8) If his older brother...........(not/to drive) so fast, he...........(not/to crash) into the other car. 9) If Fred...........(not/to cheat) at the test, his teacher...........(not/to phone) his father. 10) If I...........(not/to switch off) the radio, I...........(to know) about the second goal.

2/x+2-2x^2+16/x^3+8=5/x^2-2x+4 x+1/x^2+x+1-x-1/x^2-x+1=2(x+2)^2/x^6-1

1/ Sưu tầm một số câu thơ viết về trăng của Bác trong Nhật ký trong tù? 2/ Viết một đoạn văn (10-12 câu) nêu cảm nhận về vẻ đẹp tâm hồn của Hồ Chí Minh qua bài Ngắm trăng, trong đoạn có sử dụng câu nghi vấn, câu cảm thán

Cho góc AOB và tia phân giác OC của góc đó. Vẽ tia phân giác OM của góc BOC. Cho biết BOM= 35 độ. Tính số đo của góc AOM. Vẽ hình giúp mk nha. Mình đang cần gấp lắm!!!

viết đoạn văn khoảng 8 câu miêu tả của diễn biến tâm trạng của chú bé Phrăng trong buổi học cuối cùng lý giải vì sao lại có sự thay đổi đó

Check your writing: reordering – making sentences Write a number in the brackets to put these words in the correct order. Then write the sentence below. Example : A. name’s (_2_) Sara (_3_) My (_1_) and (_4_) fifteen (_6_) I’m (_5_) My name’s Sara and I’m fifteen B. school (__) are (__) subjects (__) Maths and ICT (__) I like (__) and (__) my favourite (__) …………………………………………………………………………………………………. C. when I (__) want to (__) I (__) school (__) computers (__) leave (__) work with (__) …………………………………………………………………………………………………. D. What (__) you (__) ? (__) subjects (__) do (__) like (__) at school (__) …………………………………………………………………………………………………. E. hockey (__) play (__) the (__) At (__) I sometimes (__) weekend (__) …………………………………………………………………………………………………. F. and (__) Write soon (__) yourself (__) me (__) tell (__) about (__)