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Approximately what energy must be supplied to melt 0.2 kg of ice at 0 Co ? Why do Periodic trends appear across the periods and down the groups? What is the pH of a solution formed by mixing 50.00 mL of 0.2000 M H2SO4 with 60.06 mL of 0.333 M KOH? 1. Give two functions f(x) & g(x) such that (fg)(-1)=4. 2. Give two functions f(x) & g(x) such that f(g(2))=7.? U-235, an alpha emitter with a half-life of 703 million years.
How long amount of U-235 to reach 1/2 of its initial amount?