Uranium oxide. the half-life of the uranium-238 isotope present in these dishes is about 4.5 billion years. this implies that most of the uranium-238 is still in the dishes and very little has decayed to emit ionizing radiation. uranium-238 initially decays into thorium-234 and an alpha particle as shown in the background, but thorium-234 can further decay to emit beta particles and gamma radiation. what is the decay reaction of thorium-234?

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Describe what happens to the molecules as water goes from ice to liquid to vapor. be sure to explain what happens to the temperature during the phase changes.