Hòa tan hoàn toàn 4,8 gam magie vào dung dịch axit sunfuric chứa 29,4 gam axit H2SO4 thu được 0,4 gam khí hiđro và muối magie sunfat. a) Viết phương trình chữ của phản ứng trên. b) Viết biểu thức về khối lượng của phản ứng xảy ra. Biết sau phản ứng còn dư 9,8 g axit H2SO4 . c) Tính khối lượng muối MgSO4 thu được.

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làm hộ với ạ Have you ever wondered what the weather is like in other places around the world? Today, I’d like to talk about the changing seasons in my city. The winter season usually begins in December and ends in early March. The coldest month is January, and temperatures can drop below freezing for most of this month. The city usually averages about 30 inches of snow during this 3-month period. Occasionally, we have snow storms that can drop a foot of snow in a very short period of time. Spring usually arrives in late March, it’s a beautiful season because the flowers start to bloom. It is sometimes windy, and this is great for flying kites. People in my city often like to go on picnics, stroll though parks, and play outdoor games. Summer starts in June and it’s very dry with little rain throughout the season. Fortunately, the weather is very dry with low humidity, so it is real pleasant even on hot days. And finally, summer changes to fall in late September when the weather cools off, and the trees begin to change colors. A lot of people enjoy driving into the mountains and viewing the fall colors. Question 26-29. Choose the best option for each statement 26. The passage is about………………… A.the changing seasons B. summer C. winter D. flowers 27. Which month is the coldest one in the winter? A. February B. March C. December D. January 28. The winter season usually begins in ………………… A. December B. March C. November D. January 29. Spring is a great season for …… A. cycling B. jogging C. flying kites D. games