If you leave 750 mL of 0.50 M sodium chloride solution uncovered on a window sill and it evaporates so that only 390 mL is left, what will the new concentration of the sodium chloride solution be?

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

What is the percentage of hydrogen in nitrogen trihydride

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.