Which of the following is an example of a physical change, but not a chemical change?
a
a water pipe freezes and cracks on a cold night
b
a tree stores energy from the Sun in its fruit
a log gives off light and heat as it burns
d
a penny left outside slowly turns green

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

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?