Why was becquerel’s experiment a first step in discovering radioactivity? a-it showed that a substance could phosphoresce when it was not exposed to light. b-it showed that the substance that was used by becquerel could phosphoresce. c-it showed that a substance could constantly emit radiation even if it was not exposed to light. d-it showed that a substance emitted radiation when it was exposed to light.

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.

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Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.