Which of the following are true about balanced chemical reactions? (Select all that apply)
a. Atoms of each element are equal on both sides.
b. Chemical equations must be balanced to satisfy the Law of Conservation of Mass.
c. Coefficients are added to balance the equation.
d. It is better to change subscripts to balance equations.
e. All chemical formulas have a coefficient greater than one.
f. Balanced chemical equations help to determine the number of moles needed in the reaction.

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Which of these conditions most likely produces an unstable isotope?

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?