Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+,Fe2+,I-,O2-

What is the correct lewis structure for chloroform chcl3

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

What are the similarities of physical and chemical change ?