Base on the ancient observation how do earth and other planets move in a geocentric model

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?