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vyjongin
2 năm trước
Bài 4: Hòa tan hoàn toàn 12,1 g hỗn hợp gồm Fe và Zn cần vừa đủ 200ml dung dịch HCl 2M. a. Viết phương trình b. Tính tổng thể tích khí H2 sinh ra ở đktc c. Tính CM các chất thu được sau phản ứng
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B. Read the passage carefully, then decide whether the following statement are true (T) or false (F) The proverb 'A friend in need is a friend indeed.' means that we shall know who our real friends are when we are in need. Those who desert us when we are in difficulty are just unfaithful friends. A true friend would remain with us whether we are rich or poor. Some people be friend the rich, simply for the sake of getting benefits from them. It is useless to have insincere friends because these friends remain with us as long as we are rich or powerful. It is better to have one or two good friends rather than having hundreds of insincere ones. A true friend will stand by us in our trials and tribulations. He will be a great source of consolation and comfort in our troubles. So we must be careful in choosing our friends. It is difficult to choose a sincere friend overnight; it takes years for us to find a sincere friend. 41. Real friends share everything we need. 42. Unfaithful friends stop being our friends when we are in trouble. 43. A rich friend is always a true friend. 44. A true friend is always loyal to us and support us through our difficulties. 45. It's not worth having a lot of friends. 46. It may take a lot of time to find a real friend

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