Jamal has a sample of a substance and was asked to determine the density of this substance. He measured the mass to be 20g and volume to be 5cm3. What is the density of the sample? A. 4 g/cm3
B. 0.25 g/cm3
C. 10 g/cm3
D. 100 g/cm3

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description?

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

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?