Sách giải Hoá học lớp 9

Chuyên mục: Hoá học
Giới thiệu: Sách giải Hoá học lớp 9

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  • Dang quang duc
    Có phai tat ca cac chât kiêm đêu là bazo ko ? Dan ra cong thuc hoc hoc cua ba chât kiêm minh hoc
    Co phai tat ca cac bazo deu la chat kiem ko ? Dan ra cong thuc hoc hoc cua bazo de minh hoc
      Dang quang duc   13/10/2020 00:47
  • chieu
    rat hay
      chieu   27/08/2017 18:19
  • Giang
    Có ba lọ không nhan , mỗi lọ đựng 1 trong các chất rắn sau ;CaO,NaCL2,Na2SO4.trinhf bày cách nhận biết 3 chất trên bằng phương pháp hóa học và viết phương trình hóa học cho phản ứng
      Giang   30/09/2016 23:47
    • @Giang: k biết bạn có nhầm đề k, nếu đề là pb CaO, Nacl, Na2So4
      đầu tiên cho nước vào 3 mẫu: mẫu nào tỏa nhiệt, tạo dung dich màu trắng, nước vôi trong là CaO, 2 mẫu còn lại không hiện tượng
      CaO+ H2O => Ca (OH)2 + H2
      lấy Ca (OH)2 thua được cho vào 2 dung dịch còn lại, dung dịch nào tạo kết tủa đó là dung dich Na2SO4. dung dịch còn lại không hiện tượng gì
      Ca(oh)2+ na2So4 --> CaSO4 ( kết tủa trắng,) + 2Naoh
        hoang   14/01/2017 01:55
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