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Bài 3: Cho một lượng mạt sắt dư vào 400 ml dung dịch HCl 1M, thu được khí H2. a) Viết PTHH b) Tính thể tích khí H2 thoát ra (đktc) và khối lượng Fe phản ứng. c) Dẫn hết toàn bộ lượng khí H2 ở trên qua ống đựng CuO nung nóng dư, thu được 10,24 gam Cu. Tính hiệu suất của phản ứng.

giải giúp mk vs v4 - 2v3 + v28 - 10v3

VI. Read the following passage, and then decide if the statements that are TRUE or FALSE (1.5pt) The mobile phone has become a very important device in our life today. It is not just used to call other people. It is used for texting messages, photos and videos and for chatting as well. In recent years, with smartphones, people can do a lot of more things, such as reading news, joining social media, and of course playing games. The first mobile phone call was made in 1973. The handle device used weighed 1.1 kg. Its talk time was just half an hour. Nowadays, however, mobile phones have become much smaller, and of course they allow us to talk much longer. Police records show that mobile phones have become “thieves’ favorite”. Maybe it is because they are easy to be hidden and some of them are very expensive. In 2012, half of the robberies in San Francisco were thefts of mobile phones. 27. The first mobile phone call was made over 46 years ago …………… 28. The first mobile phone was very heavy but its talk time was very short. …………… 29.The mobile phone has shrunk a lot of size over time. …………… 30. Modern mobile phones allow us to talk shorter than the first ones. …………… 31.The passage is about:……………………………………………………………………………. A. The history of telephones. B.The advantages of mobile phones. C. The difference between telephones and mobile phones D.Why thieves prefer mobile phones. 32.The phrase have become their “favorite” means:…………………………………………… A.Mobile phones are used worldwide. B.Thieves like using mobile phones. C.Mobile phones are useful. D.Thieves like stealing mobile phones. giúp em với ạ

cho 13,44 l so2 (đktc ) vào dung dịch koh tính m muối thu được trông các trường hợp sau a 500 ml dung dịch koh 1 M b 700 ml dung dịch koh 2 M c 500 ml dung dịch koh 1,5 M

cho mạch điện R1nt(R2//R3) Uab=10V R1=2,6ôm R2=4ôm R3=6ôm Tính Rtđ I1=?,I2=?,I3=?

Câu I Em hãy biểu diễn các số sau trong máy tính. a) 250 = ? b) 00010 = ? c) 9DC=? Câu 2: Chuyển đổi sang hệ cơ số 2 và 16 các số sau a)246 = ? b) 198=? c) 255 = ?

Giúp em câu a,b,c em đg cần GẤP lắm ạ

Complete the sentences with the words: boarding ceremonies communal costume culture customs display diverse ethnic worship 1. The…………… house is the biggest house in the village. 2. The Hoa's ……….. is more colorful than the Nung's. 3. Which ………………… group has a larger population, the Bru-Van Kieu or the Khmer? 4. Does the Yao have a rich................... of folk literature and art? 5. The Hmong people hold festivals and...................... every year. 6. Like some other peoples, the Thai.................. their ancestors. 7. Many ethnic minority students are studying at..................... schools. 8. The peoples of Vietnam are................... but very peaceful. 9. The ethnic minorities peoples have their own............................. and conditions. 10. The items on.................. in The Museum of Ethnology are very interesting.

B= $\frac{x^2-2x+6}{x+1}$ tìm x để B có giá trị nguyên