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hp102nba
2 năm trước
Hòa tan 5,5g hỗn hợp gồm Mg, Al và Cu vào dung dịch HCl dư sau phản ứng thu được dung dịch A và 1,6g chất rắn không tan. Cho thêm dung dịch NaOH dư vào dung dịch A thu được kết tủa, nung kết tủa đến khối lượng không đổi thu được 2g chất rắn. a) Viết các phương trình hóa học xảy ra b)Tính phần trăm theo khối lượng các kim loại trong hỗn hợp đầu.
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I. Choose the best answer A, B, C or D to complete the sentences. 1. ( Cook / Boil / Peel / Combine ) some water, and pour it into the glasses. 2. Can you ( slice / chop / peel / spread) the cucumber into chunks. 3. Have you ( peeled / marinated / grated / dipped ) the potatoes for me? 4. My mother usually ( fries / stews / steams/ whishes ) fish because she doesn’t like oil. 5. You should ( wash / water / drain / dip ) the pasta before mixing it with tomato sauce. 6. They usually have a ( start / starter / dessert / supper ) before having the main course. 7. The first solid food my mother gave my little baby sister was (sliced /puréed / roasted/ steamed) pumpkin. 8. You should ( spread /sprinkle / dip / marinate ) butter on a slice of bread and put it in the oven for two minutes. 9. ( Separate / Combine / Peel / Marinate ) the celery and sprawn, and mix them well. 10. English people often serve salad as a ( start/ starting / starter / started 11. She fried the chicken in only two minutes so it looked ( undercooked / undercooking / overcook / overcooking). 12. If you like ( spice / spicy / spicing / spiced) food, try Tom Yum, a kind of soup from Thailand. 13. You should be careful if you use this ( sharp / blunt / heavy / slight ) knife. 14. Don’t you forget to add salt to this soup? It’s so ( tasting / tasty / tasteful / tasteless) 15. Please remove fat from the pork. I prefer ( raw / fresh / cook / lean) meat. 16. To have delicious fresh with tartar sauce, you should first ( dip / mix / marinate / spread) the fish in salt and lemon juice for half an hour. 17. ( Grilled / Grill / Boil / Boiled) girdle cake, a popular street food is considered as Vietnamese pizza. 18. Don’t cut the beef into thick ( chunks/ pieces / fibre / slices ).it’s hard to soak into the sauce. Just slice it thinly. 19. Can you give me a ( clove / bunch / stick / loaf) of garlic? - Oh, just one peeled. 20. When the water boils, add some salt and ( some / a / any / the ) slice of lemon into the soup. 21. Put the (combination/ connection / assortmemt/ mixture) of flour, eggs and milk into the oven and wait for 10 minutes. 22. Olive oil is so ( flexible / versatile/ multitalented/ alternative). You can use it for cooking, removing car grease or paint from your hands, skin whitening, ect. 23. Turn the heat down and let it (stir-fry / simmer / cubes/ steam) for thirty minutes. 24. I f you want to lose weight, you ( should/ shouldn’t / have/ mustn’t ) cut down on your sugar intake. 25. This meat is beautifully tender. Can you share your ( ingredients/ flavor/ recipe / receipt) with us? Giúp mình ạ cảm ơn nhiều

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