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There are four naturally occurring isotopes of the element chromium. The relative abundance of each is 50Cr - 4.345% 49.946044 amu 52Cr - 83.789% 51.940508 amu 53Cr - 9.501% 52.940649 amu 54Cr - 2.365% 53.

The ionization energies of rubidium and silver are 4.18 and 7.57 eV, respectively. Calculate the ionization energies of an H atom with its electron in the same outermost orbitals as in these two atoms and account for the differences in values in

Complete as seguintes equações e indique os pares de ácido 1 base 1 e ácido 2 base 2 a) HNO2 + H2O b) H2PO-4 + H30 - C) C6H5 - NH3 + OH - d) CH3NH3 + H2O

How many grams of hydrogen is needed to produce 12 grams of water?

When aluminum oxidizes in air, it forms aluminum oxide (Al2O3): 4Al (s) + 3O2 (g) →2Al2O3 (s) A 102 g sheet of aluminum oxide formed completely in excess oxygen. How many grams of aluminum were oxidized? 27 g 51 g 54 g 102 g 54 is correct answer

How do the rates of the forward and reverse reactions change throughout a reaction?

An unknown solution turned red litmus paper red, turned blue litmus paper blue, and didn't conduct electricity. The solution is most likely ... a Basic b Acidic c Neutral d Not enough information to determine

Which of the following does NOT occur at a subduction zone? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One oceanic plate moves into another oceanic plate. D.

4. What structural characteristics do all hydrogen atoms have in common?

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers