Serenity

Câu 1: Dãy chất nào sau đây tác dụng với dd axit HCl ? A/ NaCl, Zn, CuO, Fe(OH)3. B/ CaCO3, Cu, CuO, Fe(OH)3. C/ CaCO3, Zn, CuO, Fe(OH)3. D/ CaCO3, Zn

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Câu 1: Dãy chất nào sau đây tác dụng với dd axit HCl ? A/ NaCl, Zn, CuO, Fe(OH)3. B/ CaCO3, Cu, CuO, Fe(OH)3. C/ CaCO3, Zn, CuO, Fe(OH)3. D/ CaCO3, Zn, SiO2, Fe(OH)3. Câu 2: Nhận biết 4 dd H2SO4, Ba(NO3)2, NaOH, NaCl dùng A/ BaCl2 B/ Quì tím C/ Na2SO4 D/ KOH Câu … Đọc tiếp

IV. Mark the letter a, b, c or d to indicate the sentence that best combines each pair ofsentences 27. The water is very cold in January. We go swimmi

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IV. Mark the letter a, b, c or d to indicate the sentence that best combines each pair ofsentences 27. The water is very cold in January. We go swimming anyway. a. When the water is very cold in January, we go swimming anyway. b. As the water is very cold in January, we go … Đọc tiếp

most of the undeveloped countries need a lot of –. aid A. together B. unselfish C. mutual D. friend ở câu này mấy bn giải thk cho mk vì sao chọ

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most of the undeveloped countries need a lot of ……… aid A. together B. unselfish C. mutual D. friend ở câu này mấy bn giải thk cho mk vì sao chọn C đc ko ạ _________________________ Arrange these words or groups of words in the correct order. 1) tell/have/news/We/to/not/got/any/you __________________________________________ 2) to/8:00/for/It’s/be/before/impossible/me/there. _______________________________________ 3) man/though/window/5/I/minutes/jump/the/saw … Đọc tiếp