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2 năm trước
Câu 14. Nồng độ % của một dung dịch cho biết A. Số gam chất tan có trong 100g nước. B. Số gam chất tan có trong 1000ml dung dịch. C. Số gam chất tan có trong 100ml nước. D. Số gam chất tan có trong 100g dung dịch. Câu 15. Phản ứng hóa học nào dưới đây không phải là phản ứng thế? A. CuO + H2 -- t o- Cu + H2O B. MgO + 2HCl --- MgCl2+ H2 C. Ca(OH)2 + CO2 --- t o--- CaCO3 + H2O D. Zn + CuSO4 --- Cu + ZnSO4
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