user-avatar
hainguyen290101
2 năm trước
Trong phòng thí nghiệm có các hóa chất là các dung dịch : NaOH, HCl, NaCl, Fe2(SO4)3. Lựa chọn hóa chất thích hợp, tiến hành thí nghiệm chứng minh tính chất: dd axit tác dụng với bazơ. Nêu hiện tượng quan sát . Giải thích?
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Giúp em mấy câu này với ạ. Em cảm ơn nhiều. Giải chi tiết mà dễ hiểu giúp em với nha. Em có xem những bài khác trên mạng rồi mà em vẫn chưa hiểu nên mong anh chị giải rõ ràng giúp em với ạ. Câu 17: Một gen nhân đôi đã sử dụng của môi trường 42300 nu. Các gen được tạo ra có chứa 45120 nu. Số lần nhân đôi của gen là: a. 7 lần b. 6 lần c. 5 lần d. 4 lần Câu 18. Một phân tủ AND của vi khuẩn có chiều dài 4080A0 và A = 2G. Phân tử AND này nhân đôi liên tiếp 5 lần. Số nu loại G môi trường cung cấp cho quá trình nhân đôi là a. 12800 b. 12400 c.24800 d. 24400 Câu 19.Phân tử AND của vi khuẩn E.coli chỉ chứa N15 phóng xạ. Nếu chuyển E.coli này sang môi trường chỉ có N14 thì sao 5 lần tự sao, trong số các phân tử AND con có bao nhiêu phân tử còn chứa N15? a. 4 b.2 c.6 d.8 Câu 20. Phân tử AND của vi khuẩn E.coli chỉ chứa N15 phóng xạ. Nếu chuyển E.coli này sang môi trường chỉ có N14 thì sao 4lần tự sao, trong số các phân tử AND con có bao nhiêu phân tử chứa hoàn toàn N14 a. 12. b.14 c.16 .d.20

Question 5: The artwork was _____________ done by the artisan. A. carefully B. careful C. care D. careless Question 6: Last Sunday we arrived at the waterfall nearby ____________ 7a.m. A. at B. in C. of D. on Question 7: More and more young people are moving to the city as there are __________ of job opportunities here. A. a lot B. much C. many D. a little Question 8: The light went out while he _________ dinner with his family. A. had B. have had C. was having D. is having Question 9: I got some ___________ advice on how to make a presentation from my English teacher, so I passed my oral test. A. useless B. useful C. uselessness D. usefulness Question 10: They decided to learn French ____________ study in Paris. A. in order B. so as to C. so that D. in order that Question 11: Your brother passed the final exam, ______________? A. doesn’t he B. didn’t he C. does he D. did he Question 12: ____________ his aunt rally likes the apartment, she can’t afford to buy it. A. Although B. Because C. If D. So Question 13: The students enjoy __________badminton every morning. A. playing B. plays C. to play D. played Question 14: The doctor advised my uncle to stop ___________ because it’s quite harmful to his health. A. to smoking B. smoking C. smoke D. to smoke CÁC BẠN LÀM VÀ GIẢI CHI TIẾT GIÚP MÌNH VS Ạ

1. They got married last year and plan to _______ a family.A. beginB. startC. makeD. have 2. Born in 1882, Roosevelt came from an _______ and well-to-do landowning family of upstate New York.A. old-fashionedB. old-traditionalC. old-establishedD. old-aged 3. The baby is _______ next week, all her family members are eager to welcome him.A. dueB. bornC. comeD. arrived 4. We live with my mum now, but we’ll _______ home on our own soon.A. make upB. build upC. start up D. set up 5. The father _______ for custody of thechildren, but the judge _______ custody to the mother.A. requested/sentB. asked/grantedC. applied/grantedD. command/gave 6. She is not sure how many babies she’s carrying. She’s _______ a baby in September.A. waiting forB. expectingC. longingD. hoping 7. He was born in a _______ family –his father is the breadwinner and has a voice in the family so he rules and controls everything. A. patriarchal B. royal C. nobleD. eccentric 8. They need more time to reconsider their marriage life, they are having trial separation. It’s 2 months Mike hasn’t talked to his _______ wife.A. distantB. strangeC. divorcedD. estranged 9. I’m happy to live in a very _______ family. All members in my family always take care of each other and have mutual understanding.A. well-offB. landowningC. close-knitD. well-to-do 10. They had to experience a difficult childhood in a _______ family in which their parents were in bad relationship. A. malfunctionedB. dysfunctionalC. multifunctionalD. functional 11. Her husband and her _______ live in Moscow.A. immediate family B. nuclear familyC. extended familyD. multi-generation family 12. Although they had a trial separation, they finally decided to get a divorced. He went through a _______ divorce.A. crankyB. peaceableC. sarcasticD. acrimonious 13. The fact that he didn’t welcome his _______ -Tom & Peter (2 sons of a cousin of his father) from the countryside made his father so sad.A. close relativesB. distant relativesC. near relativesD. blood relatives 14. Simon came from a _______ family, so Mary’s parents felt happy about the marriage.A. respectfulB. respectedC. respectableD. disrespectful 15. He never forgets his _______ wife so he isn’t ready to step into another woman’s life.A. diedB. lateC. earlyD. dead 16. My uncle is a _______, he seems to have no intention of ever marrying.A. confirmed bachelorB. verified singleC. fresh manD. available man 17. The custom officer made me surprised when he asked me to fill in my _______‘s name although I had told him “I am still single”.A. siblingsB. partnerC. spouseD. companion 18. There is no _______between Mac and Gary, even though they are brothers.A. appearanceB. correspondenceC. reflectionD. resemblance 19. Mr & Mrs Nancy live with their two children. They are a typically example of modern _______ family.A. extendedB. nuclearC. compactD. combined 20. Mr & Mrs Mary live at home with their aged parents, childrenand grandchildren. They are a typically example of modern _______ family.A. nuclearB. enlargedC. extendedD. compact

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team