In which of the following examples has a chemical reaction occurred? a .after putting liquid batter into a hot pan, the batter solidifies and begins to turn brown. b .after turning on a blender filled with fruits, the fruit is chopped up and mixed together. c. after taking a tray filled with ice cubes out of the freezer, the cubes begin to melt. d. after adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?