Giúp mình nha thx Vôi sống (CaO) hay vôi nung được tạo ra từ quá trình nung đá vôi ở nhiệt độ cao trên 900oC. Vôi sống thường được sử dụng trong các ngành công nghiệp luyện kim, xử lý nước thải, môi trường, điều chỉnh độ pH của đất, hấp thụ hơi axít…Cho 5,6 gam CaO vào 200 gam nước, khuấy đều và để yên hỗn hợp một thời gian ở 25oC. Lấy 10,0 gam dung dịch Ca(OH)2, sau đó thực hiện phản ứng trung hòa thì cần 17,60 ml dung dịch HCl 0,025M. (a) Tính độ tan (g/100g dung môi) và nồng độ % của dung dịch Ca(OH)2 ở nhiệt độ trên?. (b) Nếu cho thêm 500g nước vào hỗn hợp trên thì nồng độ Ca(OH)2 thay đổi như thế nào. (c) Có tồn tại dung dịch Ca(OH)2 0,5M hay không? Giải thích (d) Cần tối thiểu bao nhiêu gam nước để hòa tan hoàn toàn 5,6 gam CaO ở trên? (e) Trộn 50,0 gam dung dịch CaCl2 16,65 % vào 100 gam dung dịch NaOH 2% và Na2CO3 5,3% được dung dịch B và m gam kết tủa. Tính khối lượng kết tủa và nồng độ % các chất có trong dung dịch B. Biết rằng các thí nghiệm thực hiện ở 25oC và giả sử trong dung dịch các muối không làm thay đổi độ tan của Ca(OH)2 trong nước.

giúp em với ạ , em đg cần gấp 😭

HELPPPPPPPPPPPPPPPPPP Tìm Min của : 1.x^2 + 2x + 9 2.2x^2 + 4x + 10 3. x^2 + 3x + 5 4. x^2 + 6x - 15

(team-building, embroider, workshop, craft, drumheads reminds, numerous, versatile, stage, treated cast, weave, surface, craftsman’s, frame) -> III. Complete the sentences using the given words/ phrases. 1. The traditional __________ village attracts millions of foreign tourists each year. 2. People use buffalo skin to make the __________. 3. His parents want him to take over their family’s __________ which was set up by his grandparents. 4. I need to buy a new __________ for the picture. Do you know any shops near here? 5. We are looking for a manager with good __________ and leadership skills. 6. It takes great skill to __________ a statue in gold. 7. She can __________ more than fifty bamboo baskets a day. 8. The __________ piece of pottery must be worth a million dollars. 9. They __________ the scarves with flowers to make them more colorful. 10. It’s hard to find a marble with such a smooth and shiny __________. 11. __________ handicraft products from different countries are displayed for sale at the fair. 12. That picture always __________ me of my hometown. 13. The problem of air pollution cannot be __________ until they work together. 14. This basket is extremely __________- You can use it for lots of different purposes. 15. I’m not allowed to tell you about the plan at this __________.

Số lớn nhất trong các số: 85 091, 85 190, 58 901, 58 910 là: A. 85 091 B. 85 190 C. 58 901 D. 58 910

cho cotg a =6/7 tính tg a, sin a, cos a biết sin a = 8/17 tính B= sin^2 a +3 cos^2 a

Làm Bullet journal Vintage nèo UvU Tradi,đẹp,đầu tư

Làm giúp mình với 😭 1. I/ get/ so bored/ look / people's/ photographs. 2. We/know/neighbors / about / two years / now. 3. He / told/ me / not / walk / that area/ night. 4. It/ first time /I/ see/ that man / here. 5. School uniforms /wear/ most/ school children /Viet Nam. (passive) 6. They/ not/ able / buy / house / if/ they not / borrow/bank. (third conditional) 7. He/ excited / drive / across /Europe / summer. 8. My little brother / run/ fast / than/I. 9. When/ we /be/holiday/went/ swimming / every day. 10. Although / I / understand / what / he / say, / disagree/ his point of view.

I. Choose the word or expression which best fits each gap of the sentence. 1. He works as a/ an ______ in his uncle’s workshop. A. attraction B. artisan C. embroider 2. Vietnamese ______ is now available to purchase online. A. lacquer B. lacquers C. lacquerware 3. Those handicrafts may face the challenges of losing their ______. A. authenticity B. sculpture C. craft 4. How many ______ of leaves does a Hue’s conical hat have? A. surface B. layers C. frames 5. I know some interesting tourist ______ in the city that you would love to visit. A. sculptures B. attractions C. handicrafts 6. The car has been ______ in clay. A. moulded B. woven C. embroidered 7. The scarf embroidered with gold ______ is the most expensive one in our shop. A. frame B. layer C. thread 8. Burglars broke into the museum and stole dozens of valuable marble ______. A. crafts B. sculptures C. workshops 9. Local people often sell ______ like bracelets, scarves and hats to tourists. A. lacquerware B. artisans C. handicrafts 10.They need to find a solution to ______ the local environment. A. preserve B. cast C. weave 11.The company is going to close ______ one of its stores due to reduced sales. A. on B. to C. down 12.He was thinking of passing ______ the workshop to his eldest son. A. with B. to C. down 13.You had to face up ______ the fact that she would never come back. A. to B. at C. with 14.I just wondered why she turned ______ his offer of help. A. on B. down C. back 15.He is going to set ______ a travel company next year. A. down B. with C. up 16.If she doesn’t turn ______ by 6.15, they will leave the party. A. on B. up C. off 17.He wanted someone to take ______ his role once he retired. A. over B. up C. back 18.His salary isn’t enough for his family to live ______. A. over B. on C. up 19.Do you know what time we will set ______ tomorrow? A. up B. on C. off 20.This craftsman is the most ______ in the village. A. skillful B. skill C. skilled

vẽ mầm NL:gặp mấy đứa cùng lớp mới hỏi mình các thứ....... Tui:hơi thở của lá,thức thứ nhất:CHE GIẤU TÀI NĂG