Đáp án: Có nhaaa :>
Giải thích các bước giải:
CaO có thể kết tủa xuống khi trộn dung dịch chứa Canxi clorua (CaCl2) với dung dịch chứa Natri hiđroxit (NaOH).
#Regina
#Chúc cậu học tốt nhaa :>
Đáp án:
Theo tính chất hoá học thì Ca là kim loại kiềm tan nên nếu là hợp chất oxit thì nó là oxit bazo tan
Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks. Would you like to learn to rock climb? Or spend time working at an animal sanctuary? That's (23) ____ Andrea Black and Jenny Smith are doing as part of their Duke of Edinburgh Award programme. The award encourages young people to do (24) ____ cultural, social and adventurous activities in their free time. The Queen's husband, the Duke of Edinburgh, started the award in 1956. He started it (25) ____ he wanted young people to learn to help themselves and other people.The award is for people aged 14-25, and there are three levels: Bronze, for those aged 14 or over, Silver for over 15s, and Gold for over 16s. You have to complete four activities to (26) ____ the award: - go on an expedition (e.g. hiking, kayaking or climbing) - learn a new practical or social skill (anything from painting to podcasting!) - take (27) ____ a physical challenge (e.g. learn or improve at a sport) - do voluntary work helping people or the environment (e.g. work with disabled or elderly people, or (28) ______ money for a charity). Young people usually do the award at a Duke of Edinburgh club at their school or at a local youth group. They (29) ____ what they are going to do, and write a plan. It usually takes (30) ____ one and three years to finish an award. 23. A. what B. why C. which D. when 24. A. excited B. exciting C. excitement D. excite 25. A. therefore B. but C. because D. if 26. A. compete B. accept C. realize D. achieve 27. A. on B. in C. away D. after 28. A. lift B. increase C. raise D. advance 29. A. decide B. are deciding C. decided D. had decided 30. A. from B. in C. during D. between
Giúp mình với ạ cảm ơn mọi người
mn ơi mn xem em có làm đúng ko nhéO^O
Em xin mng đấy. Mng giúp em đi mà em cần gấp rất gấp luôn ạ.
Câu đố trí tuệ 6: Viên tướng nọ muốn chọn một người lính thông minh nhất để đề bạt làm sĩ quan chỉ huy. Ông tập trung mọi người trong sân tập rồi nói: – Ai có cách gì để lính gác cho ra khỏi sân đường hoàng, vui vẻ, sẽ được thăng chức. Mọi người đang vắt óc ra suy nghĩ mà vẫn chưa tìm ra cách nào. Lúc này, một anh lính đến gần lính gác nói duy nhất một câu. Thế là lính gác liền cho anh ta ra ngoài. Bạn thử đoán xem anh lính đã nói gì với người lính gác để được ra ngoài?
Giúp mình bài này với ạ . Mình cảm ơn
Chiều của một đường đua hình tròn là 3,6 km.hai xe máy chạy trên đường này hướng tới gặp nhau với vận tốc v1 là 36km/h và v2 là 54km/h.hãy xác định thời gian nhỏ nhất tính từ thời điểm họ gặp nhau tại một nơi nào đó trên đường đua đến thời điểm họ gặp nhau tại chính nơi đó
1. If it rained heavily,we (stay) at home. 2. I do not understand why Hillary (always forget) her umbrella. 3 . His mother,together with her friends,(just arrive) at the station. 4 . There is no point in (complain) about your son if you can do nothing (help) him.
Nhờ mn giải hộ em ạ cảm ơn mn nhiều
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. enough B. plough C. rough D. tough 2. A. believes B. dreams C. girls D. parents 3. A. kissed B. laughed C. looked D. loved Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions. 4. A. donate B. compare C. campaign D. flashy 5. A. experience B. mobility C. independent D. prioritise Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. 6. My grandpa is the most conservative person in my family. He never ____ about way of life. A. gives his opinion B. changes his mind C. express his view D. keeps in mind 7. Anna often dresses ______ when going to the parties in order to attract her friends' attention. A. plainly B. properly C. flashily D. soberly 8. All students _______ wear uniforms at school because it is a rule. A. should B. have to C. ought to D. must 9. You ____ finish your homework before you go to bed. A. must B. have to C. could D. oughtn’t to 10. This drink isn't beneficial for health. You ____ drink it too much. A. should B. ought to not C. ought not to D. mustn't 11. All three boys seem to fall ____ over heels in love with her. A. head B. heart C. mind D. soul 12. She says she has kissed and ____ up with Nigel, and the reunion was a fun night. A. caught B. done C. made D. took 13. Due to financial conflict over the years, they decided to get ____. A. divorced B. engaged C. married D. proposed 14. “Do you mind if I sit next to you?” – “____” A. Don't mention it. B. My pleasure. C. No, not at all. D. Yes, why. 15. “Hello. ____” – “Hello. Hold on please. I get you through.” A. Can I meet Mr Green? B. Can I take Mr Green's number? C. May I speak to Mr Green? D. Where is Mr Green's room? 16. The government must take ____ action against environmental pollution. A. important B. unstable C. decisive D. soft 17. My teacher always gives me advice ____ suitable career in the future. A. choosing B. to choose C. choose D. not to choose 18. We're ____ to announce that you were selected to be our new faculty manager. A. happily B. unhappy C. happiness D. happy 19. It is unnecessary for ____ to do this task. It's not ours. A. we B. us C. they D. our 20. The chef tastes the meat ___________ before presenting it to the Minister. A. cautious B. more cautious C. cautiously D. much cautious
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