If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls

Joan writes four numbers on the board in standard form, and then she writes their scientific notation