Which cell organelle forms an outside covering that allows things in and out? Group of answer choices

D. Mitochondria

E. Cell Wall

A. Cell Membrane

C. Cytoplasm

B. Nucleus

Calculate the number of molecules present in 0.750 mol of mgo.

Give the orbital configuration of the phosphorus (p) atom.

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?