Formation of barium sulfate, which is completely insoluble in water is used as the basis of a classic procedure for analyzing the amount of barium in a sample. write a chemical equation for the double replacement, precipitation reaction of an aqueous solution of barium nitrate with concentrated sulfuric acid.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

Consider the directing effects of the substituents on salicylamide and predict the possible structures of the iodination products. which do you think will be the major product?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit