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Tieumii1999
2 năm trước
Trộn 300 gam dung dịch H2SO4 9,8% với 200 gam dung dịch BaCl2 26%, thu được a gam kết tủa và dung dịch X. a) Viết phương trình hóa học của phản ứng xảy ra. Tính a. b) Xác định nồng độ phần trăm các chất trong dung dịch X.
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A very useful bagImagine you are walking to school listening to music on your MP3 player. All of asudden, it stops working and you 1. _______that the batteries have run out. Wouldn’t itbe wonderful if you could simply 2. ______the batteries wherever you are? This might bepossible in a few years’ 3._____as scientists are now working on a bag that makeelectricity. They say that all someone needs to do is put the bag their back and startwalking. The 4.______ of the body makes electricity in a special part of the bag. Thisnew 5._____ sounds like a brilliant idea, doesn’t it? Scientists developed the “electricbackpack” in order to help soldiers, who often carry around with them torches, radios andother equipment. All these things 6_______ on batteries and at the moment, the soldiers7._____ on these batteries to 8_______ the power this equipment needs. With the“electric backpack”, the soldiers won’t need to 9.______ extra batteries around withthem. Rescue workers and mountain climbers will also find the bag 10._______, as willstudents who don’t want their MP3 players to run out by chance on their way to schoo

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