Be sure to answer all parts. plutonium−242 decays to uranium−238 by emission of an α particle with an energy of 4.853 mev. the 238u that forms is unstable and emits a γ ray (λ = 0.02757 nm). (a) write a balanced net equation for these reactions. → (b) what would be the energy of the α particle if 242pu decayed directly to the more stable 238u? mev

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

What happens when light is scattered?