Which one of the following is NOT a mass extinction? * O The Permian-Triassic event
O The K-T event
O The Cambrian Explosion
O The Ordovician-Silurian event

What is the mass of each element in a 324.8 sample of co2

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?

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon