Nguyên tố Ag tồn tại trong tự nhiên dưới hai dạng đồng vị là 107Ag và 109Ag với thành phần phần trăm số nguyên tử lần lượt là 51,84% và 48,16%. - Tính khối lượng đồng vị 107Ag có trong 21,6 gam bạc kim loại.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer in each of the following questions Question 8: He went to the office ________ check the progress of the work. A. in order to B. so far as C. for the purpose D. by the reason Question 9: Don’t let my mother watch any of those sappy movies-she cries at the drop of a_____. A. bag B. hat C. cat D. rag Question 10: While my mother ____a film on TV, my father was cooking dinner. It was March 8th yesterday. A. watched B. was watching C. had watched D. watches Question 11:She has taught English here ________ 10 years. A. in B. from C. since D. for Question 12:The children volunteer to clean up the local park ________ there are lot of used cans and trash there. A. but B. because C. and D. so Question 13: She __________school when she was six. A. started B. start C. has started D. are startin Question 14:He wishes he _________the exam . A. passes B. passed C. have passed D. pass Question 15:She loves to watch the stars _________night . A. on B. in C. at D. of Question 16:The journey to the village is very _______________ A. interested B. interesting C. disinterested D. interest CÁC BẠN GIẢI THK CHI TIẾT HỘ MK NHA

Một đoàn tàu rời ga chuyển động nhanh dần đều. Sau 100s tàu đạt tốc độ 36km/h. Gia tốc và quãng của đoàn tàu đi được trong 1 phút đó là

Cho 2 điện tích điểm có độ lớn q1=2q2=10mC đặt cách nhau 50cm trong chân kh Â) Tìm độ lớn của lực tương tác giũa chúng b) Muốn lực trên có độ lớn gấp 4 lần thì khoảng cách lúc nàu giữa chúng là bao nhiêu

EX1: Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions Question 1: A. talked B. played C. asked D. cooked Question 2: A. cough B. laugh C. weigh D. enough EX2: Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions Question 3: A. decide B. suppose C. precede D. finish Question 4: A. attention B. appropriate C. terrible D. minority CÁC BẠN GIAIT THK CHI TIẾT HỘN MK NHA

giúp mik vs mn nơi mik cần gấp

Task 2: Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it. () 1. I last had my hair cut when I left her. → I haven’t …………………………………...……… 2. This hotel is more expensive than all the others. → This hotel is the ……………...………… 3. You may want a chat, so just give me a ring. → If you ……………………………………… 4. The students suggested making the tests easier. → The students suggested ………………… 5. The city that we were born in is very large. → The city in …………………………………...

Hợp chất X có % khối lượng cacbon, hidro và oxi lần lượt bằng 81,08%, 8,1% và còn lại là oxi. Tìm CTPT của X biết MX = 148g/mol

Các b giúp mình đc k Xong mình vote 5* UY TÍN

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 5. Increasing industrialization is challenging the province to ___ every effort to control pollution. A. do B. create C. make D. give 6. You’d better not argue with them, ___ you’ll be fined. A. if B. in case C. unless D. otherwise 7. If we heat water to 100 degrees Celsius, it ___ A. would boil B. will be boiling C. is boiling D. boils 8. I do believe that his study there will be ___ great benefit to his teaching career. A. on B. to C. in D. of 9. “What’s wrong with you today? Did you get out of bed on the wrong ___?” A. end B. edge C. foot D. side 10. After a terrible argument with his boss, she handed in her ____ A. reservation B. reputation C. resignation D. responsibility 11. In order for people to work together effectively, they need ____ each other’s needs. A. to be sensitive to B. is sensitive for C. sensitivity D. sensitive 12. He was late. When he _____ at the bus stop, the bus ___ A. arrived/ had already left B. had arrived/ left C. has arrived/ left D. had arrived/ had left 13. I only have to keep on waling, _____? A. won’t I B. mustn’t I C. don’t I D. haven’t I 14. How do the police ____ the rise in juvenile delinquency? A. account for B. explain about C. make for D. look at 15. There was an accident in this area yesterday. A truck hit a tree and _____ driver was injured. A. the B. a C. an D. this 16. Elephants ____________ the ecosystems they live in, and make it possible for a lot of other species to survive in those environments as well. A. obtain B. remain C. maintain D. attain 17. ______________ unprepared for the exam, I felt sure I would get a low score. A. Upon B. Having C. Being D. Because 18. It is thought that traditional marriage ____________ are important basis of limiting divorce rates. A. records B. responses C. appearances D. values Câu 9 (VD): _______ George Wilkins has transferred to the St Louis branch, there is a vacancy in our division. Would you like to apply for? A. Owing to B. Now that C. Even though D. As to Câu 10 (TH): Species become extinct or endangered for _______ number of reasons, but _______ primary cause is the destruction of habitat by human activities. A. Ø / a B. a / the C. the / a D. Ø / Ø Câu 11 (VD): Being _____ to Manchester City, their sons have got lost many times since they moved there. A. useless B. unused C. unfamiliar D. unacquainted Câu 12 (TH): Scholars believe that there are still relics _____ under the tomb and awaiting to be excavated. A. burying B. buried C. are burying D. to bury Câu 13 (TH): There has been little rain in this area for too long, _______? A. has it B. has there C. hasn't it D. hasn't there Câu 14 (VDC): Looking down at the coral reef, we saw _______ of tiny, multi-colored fish. A. swarms B. flocks C. teams D. shoals