Clep Chemistry questions with correct answers

The positive charge of an atom is concentrated in a small region. Correct Answer-Which of the following is a correct interpretation of the results of Rutherford's experiments in which gold atoms were bombarded with alpha particles? 1s2(2s2)2p6(3s2)3p6(4s2) Correct Answer-What is the correct ground state electron configuration for Fe? Mg<Ca<Rb<Cs Correct Answer-Based on their positions in the periodic table, list the following atoms in order of increasing radius: Mg, Ca, Rb, Cs beta decay Correct Answer-Predict by what mode(s) of spontaneous radioactive decay the unstable isotope 62He might proceed. 6 Correct Answer-...P4O10 +...Ca(OH)2 --> ...Ca3(PO4)2 + H2O When the chemical equation above is balanced in terms of lowest whole-number coefficients, the coefficient for H2O is 5.00 x 10(3) kg Correct Answer-Urea, CO(NH2)2, is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. What is the maximum mass of urea that can be manufactured from the CO2 produced by combustion of 1.00 x 10(3) kg of carbon followed by the reaction? CO2 (g) + 2 NH3 (g) --> CO(NH2)2 (s) + H2O (l) 161.4 mL Correct Answer-What volume of a 0.2089 M KI solution contains enough KI to react exactly with the Cu(NO3) in 43.88 mL of a 0.3842 M solution of Cu(NO3)? 2Cu(NO3)2 +4KI --> 2CuI + I2 + 4KNO3