Is using a fuel cell to seperate water into hydrogen and oxygen a physical or chemical seperation.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

What is a metal replacement reaction

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.