Nêu hiện tượng và giải thích: a) Hơ nóng lá kim loại Mg, sau đó cho vào lọ đựng khí Cl2. b) Cho mẩu giấy màu tẩm ướt vào lọ đựng khí Cl2. c) Cho mẩu giấy quì tím ẩm vào lọ đựng khí Cl2. d) Giải thích vì sao nước Giaven và Clorua vôi có tính tẩy màu, tẩy uế, diệt khuẩn ?

BTVN c) |7-x| + 2(3x-1) = 7-3(1-2x) giải rõ giúp ạ d) |18x-9|-8|2x-1| =33

mong ac giup em ạ bài này khó quá

Giúp mk câu 1 với ko cần làm câu b đâu

khi làm lạnh một vạt rắn thì thể tích của vật ... còn .... không thay đổi

Đọc đoạn văn và điền T (true) hoặc F (false) English as a global language English is the third largest language by number of native speakers, after Mandarin and Spanish. Is has often been referred to as a “world language, the lingua franca of the modern era. English is not an official language in most countries and it is often taught as a foreign language. It is, by international treaty, the official language for aeronautical and maritime communications. English is one of the official languages of the United Nations and many other international organizations, including the International Olympic Committee. Books, magazines and newspaper written in English are available in many countries around the world, and English is the most commonly uses language in the science. Science Citation Index reported as early as 1997that 95% of its articles were written in English, even though only half of them came from authors in English-speaking countries. In publishing, English literature predominates considerably with 28 percent of all books published in the world and 30 percent of web content in 2011(from 50 percent in 200). English is also the global language of many businesses, even outside of the UK, Canada and the USA. If you have an international meeting in France, for example, odds are that you will be asked to speak English, Daimler-Chrysler, Nokia, Renault, Samsung, Technicolor, and Microsoft in Beijing have all said that English is their common corporate language, to name just a few of the largest international companies, but many smaller companies have the same policy. _____ 1. English is amongst the largest language of the number of native speakers. ______ 2. English is often taught as a second language in most countries. ______ 3. English is the only official language of the United Nations and many other international organizations. _______ 4. Most of the science works were written in English. _______ 5. It was reported that as early as 1997, 95% of Science Citation Index’s articles came from authors in English-speaking countries. _______ 6. English is not used in business outside of the UK, Canada and the USA.

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Cho 6,5g kẽm tác dụng với dd HCl tạo ra ZnCl2 và khí H2. tính số nguyên tử Zn đã phản ứng. Tính thể tích khí H2 thoát ra. Tính khối lg HCl đã dùng

khoi 6 cua 1 THCS gom 10 lop , so hoc sinh moi lop co tu 45 den 50 hoc sinh . trong buoi mua san truong , hs cua ca khoi xep hang 4 , hang 8 hay hang 15 deu vua du . hoi khoi 6 truong co bn hoc sinh

Giải hộ mk bài 1,2 ,3 với Cảm ơn nha