Which is the name of the kind of solid substance
formed in this figure?

The grooves or folds of the brain are called

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.

Areaction in which products can react to re-form reactants is