Why the synthesized ester does not always match the odour of the fragrance found in nature

What does the cell nucleus do or, how does it function?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

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.