Uranium-238 is radioactive. A uranium nucleus (mass 238 u, charge 92e) at rest decays by emitting an alpha particle (a helium nucleus with mass 4 amu and charge 2e), leaving behind a smaller "daughter" nucleus. This process can by modeled in the following way: the original uranium nucleus is a 7.4 fm radius uniformly charged sphere. Two protons and two neutrons "pinch off" to form the alpha particle, which is initially at rest and immediately adjacent to the remaining nucleus (the daughter). You can assume that at this moment their (center-to-center) separation is 7.4 fm. These two positively charged particles will then repel, "emitting" the alpha.1 (a) What is the mass and charge of the daughter nucleus? What is the name of this chemical element? (b) What is the total electrostatic potential energy of the alpha and daughter right after forming? (c) Find the speed of the daughter and the alpha after they have moved far apart. [Hint: use conservation laws.]

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

Nconcentration refers to the molar concentration of an ion in solution. it may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution. for soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. for example, 1 m of alcl3 is 1 m in al3+ and 3 m in cl−. 1 m of (nh4)2so4 is 2 m in nh4+ and 1 m in so42−. part a what is the concentration of k+ in 0.15 m of k2s? view available hint(s) nothing m m part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 550 ml of a solution that has a concentration of na+ ions of 0.700 m ? express your answer numerically in grams. view available hint(s) mass of na3po4 n a 3 p o 4 = nothing g provide feedback

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