Which of the following systems has potential energy only? A) A stone falling from a height
B) A ball rolling down an incline plane
C) A bird sitting on a branch of a tree
D) A flying bird

The p sub shell can hold up to 8 electrons in an atom. true or false?

What are the similarities of physical and chemical change ?

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.