Hòa tan hoàn toàn 4,7 gam K2O vào nước được 1000ml dung dịch A. a. Tính pH của dung dịch A.

b. Cho dung dịch A phản ứng với 100ml dung dịch H2SO4 0,05M. Tính pH của dung dịch sau phản ứng.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?