According to becquerel, what created the image on photographic film when it was placed in a drawer with uranium salt crystals?
the crystals emitted something that affected the film the same way light did.
the film caused a chemical change in the crystals.
the film exposed spontaneously, even when it was not exposed to light.
the uranium spontaneously emitted radioactive particles that exposed the film.

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?

Beaker a contains 100 ml of 1.5 mammonia. beaker b contains 100 ml of 0.50m ammonia. how does the solution in beaker a compare to the solution in beaker b?

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