Khi cho kim loại tác dụng với dung dịch HCl, H2SO4 loãng có chất khí thoát ra. Chất khí đó là chất khí nào? A. khí oxi. B. khí hiđro. C. khí lưu hùynh đioxit . D. Khí clo

What is the molarity of 60.0 grams of naoh dissolved in 750 milliliters of water? a) 1.1 m b) 2.0 m c) 12 m d) 75 m

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

Which statement would indicate the presence of an acid