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meosieunhan
2 năm trước
Cho 2,925g Muối NaX (X thuộc nhóm VIIA) tác dụng với dd AgNO3 vừa đủ thu được 7,175g kết tủa. a/ Tìm NTK trung bình của X. b/ Nguyên tố X có 2 đồng vị: 1X và 2X với tỉ lệ số nguyên tử tương ứng là 3:1. Đồng vị 2X nhiều hơn 1X là 2n. Tìm số khối của mỗi đồng vị. P/S: TRẢ LỜI ĐẦY ĐỦ, NHANH MÌNH TẶNG TIM, CTLHN Ạ <3
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Ex 3 Fill in the blank with a suitable phrasal verb. (2 ones are not used) grow up calm down keep on doing st get over st look out look after sb/ st put st off look forward to st turn st down look for sb/ st take off run out take after sb pass away 1._______relax after being angry 2._______recover from an illness, loss, difficulty 3._______become an adult 4. _______ continue doing 5. _______take care of 6. _______try to find 7. _______be excited about the future 8. _______postpone 9. _______have none left 10. _______resemble a family member 11. _______start to fly 12. _______refuse Practice 1. Would you _______ my dog for me this weekend? A. look B. look after C. look up 2. My neighbor _______ eggs yesterday. A. ran B. ran out of C. ran into 3. John _______ his leg at the baseball game. A. broke B. broke down C. broke off 4. Could you _______ the music while I'm on the phone? A. turn B. turn off C. turn around 5. We both _______ meeting our new manager. A. look B. look up C. look forward to 6. Can you _______ me up at the airport next week? A. break B. look C. pick 7. Some people are good at _______ jokes. A. making up B. making of C. making by 8. All the factories in this area were closed down last year. A. closed up B. closed down C. closed in Ex 4. Read the text and do the task below. Last year I visited the Somerset Levels, a coastal plain and wetland area in Somerset, South West England. This area is home to one of Somerset’s oldest traditional crafts - willow basket making. Basket making began in the area a long time ago. At the beginning of the 19th century, more than three thousand acres of willow trees were planted commercially there because the area provided an excellent natural habitat for their cultivation. I’d seen willow baskets before I visited the Levels, but I was still amazed at the numerous products created by the basket makers there. They make lobster pots, bread trays, and even passenger baskets for hot air balloons. Although the arrival of plastics in the 1950s caused the basket making industry to decline, willow growing and basket making have continued to play a significant role in Somerset’s rural economy. Willow growers and basket makers have dealt with this challenge by finding new markets and innovative ways of using willow. They make willow charcoal for artists and bower seats for gardens. Some even weave willow coffins. Therefore, people here can still live on the craft that their great-grandparents passed down to them. Decide T (true)/ F (false) for each statement. Question 1: Willow basket making is the oldest traditional craft in Somerset. A. True    B. False Question 2: Willows can grow well in the area because of its favourable natural conditions. A. True    B. False Question 3: The presence of plastic products did not affect the growth of the basket making industry in the area in the 1950s. A. True    B. False Question 4: Basket making does not play an important role in the area now. A. True    B. False Question 5: Willow growers and basket makers have found new ways to promote their industry. A. True    B. False Question 6: Basket makers can live on their craft nowadays. A. True    B. False Làm hộ vs ạ

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