Chỉ dùng 1 thuốc thử hãy nhận biết Cu(OH)2 Ba(OH)2 Na2CO3

Giúp em 2 phần này nhé ạ Đề bài rút gọn 2 biểu thức sau

helppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp làm nhanh giúp mình với pls

Bài 4. Trộn 250 ml dung dịch chứa x(g )ZnCl2 với 150ml dung dịch chứa y(g) Na2C03 ( Phản ứng đủ ) Lọc kết tủa nung được 12,15g rắn . a. Tính x, y b. Tính nồng độ mol /l hai dung dịch muối ban đầu c. Tính nồng độ mol chất trong nước lọc

Hòa tan hoàn toàn 2,16 gam Al vào dung dịch chứa HNO3 (vừa đủ) thu được dung dịch Y chứa 18,64 gam muối và a mol khí N2O. Giá trị của a là?

II. Choose the best answer a, b, c or d to complete the sentence. 1. I went on a trip to the countryside and had my first experience _______ farm work. a.on b. with c. for d. of 2. We usually spend our holiday in the village _______ our grandparents live. a.what b. where c. which d. when 3. I think country life is so boring and _______ because you’re not close to shops and services. a. unhealthy b.inconvenient c. comfortable d. peaceful 4. On the farm, uncle Duong showed us how to _______ cucumbers. a. plough b.produce c. pick d. put up 5. Mongolian children start to learn _______ before they can walk. a. horse riding b.riding horse c. ride horse d. horse ridden 6. On the side of the road, a herd boy was herding _______. a. kites b.hay c. cattle d. blackberries 7. Mongolian children learn to ride when they are _______ as three years old. a. as young b.younger c. younger than d. so young 8. Does your new stereo play music _______ than your old one did? a. louder b.more loudly c. loudlier d. more louder 9. Countryside is not polluted _______ you can breathe there fresh air. a. although b.however c. therefore d. as 10. ‘Children in my village often fly their kites in dry rice fields.’ ‘_______’ a. It’s right up my street! b. That’s awesome. c. Exactly what I want. d. How interesting

5 sao và câu tlhn cho ai nhanh nhất

vẽ mầm mệt NL:ốm nặng quá ko bt có chiu nổi ko '_'

1. They advised him (not/ cross) not to cross_________ the street against the red lights. 2. He and his sister (not/ meet) _________ my friends since last Christmas. 3. She (work) ______ here since she left school? 4. Everyone (read) _______ this novel, let us (discuss) ______ it. 5. I (meet) _met_______ John before I (be) ________ a fortnight in Paris. 6. The children were frightened because the lights suddenly (go) ________ out and they (sit) ________ in the dark. 7. What tune (play)…………….when we (come)…………………… in? 8. She was badly hurt when her car hit another car. If she (wear) ________ her seat belt, she (not hurt) ________ so badly. 9. Although some groups of people (1. always live) _________ outdoors in tents, camping as we (2.know) _________ it today (3. begin) _________ to be popular about 50 years ago. The increase in the use of cars and improvements in camping equipment (4. allow) ________ more people to travel longer distances into the countryside and (5. stay) _________ there in greater comfort. Many campers like (6. be)………….themselves in quiet areas, so they take their tent and food and walk or cycle into the forests or the mountains. Others, (7. prefer) _________ to be near people, (8. drive) _________ to a public or privately-owned campsite which (9. have) ___________ up-to-date facilities like hot shower and swimming pools. Whether campers are separate in the mountain or on a busy site, they should remember to keep the area clean and tidy. In the forests, they must put out any fires and keep food hidden to avoid (10.attract) ………………… animals. giúp em ạ! em cảm ơn

Viết một đoạn văn ngắn trình bày về cái hay của phần trích sau theo kiểu đoạn diễn dịch, khoảng 12 câu trong đoạn có sử dụng câu nghi vấn dùng để bộc lộ cảm xúc và phép thế để liên kết (chủ thích rõ) Nhung mỗi năm mỗi vắng Người thuê viết nay đâu? Giấy đỏ buồn không thảm Mục đọng trong nghiên sầu... Ông đồ vẫn ngồi đấy. Qua đường không ai hay Lá vàng rơi trên giấy; Ngoài giời mưa bụi bay.