2. sc 8.p.8.1
an artist heats a solid iron rod and bends it into a new shape. the iron cools down when the artist is
finished. what happens to the iron atoms as the solid iron rod cools?
a. the iron atoms move more quickly.
b. the iron atoms slow down and stop moving.
c. the iron atoms slow down and vibrate in place.
d. the speed of the iron atoms does not change.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next