UV-B radiation is in the 285-315 nm region on the spectrum. Calculate the energy (in kJ/mol) of the 288 photon that is associated with skin cancer.

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)

What are fossils of organisms that existed over a wide area but only for a limited time period called?

In an exothermic reaction at equilibrium, what is the effect of lowering the temperature? a. the reaction makes more products. b. the reaction makes more reactants. c. the reaction is unchanged.