Hailey is creating a computer model to show what happens to energy from the sun when it reaches the Earth's surface. Which of the following statements explains the energy budget on Earth?

A. Most energy is made into food by plants.
B. Earth's surface absorbs and re-emits equal amounts of energy.
C. Earth's surface reflects more energy than the atmosphere.
D. The atmosphere absorbs more energy than Earth's surface.

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Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Qand k are only the same when the forward rate of the reaction has reached zero.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.