Question

78) Spent Pu-239 fuel rods from a nuclear reactor are quite radioactive. If 15 half-lives are required for the nuclide to reach safe levels, how long must the rods be stored? (ts 24,400 years) a) 5.34 x 10 years b) 4.34 x 10* years c) 3.66 x 10 years d) 4.67 x 10 years 79) What is the molality of 125.0 ml of solution that contains 5.55 g of Caci,? M moles of solute L of solution a) 5.10 M b) 0.400 M c) 0.0510 M d) 0.313 M 80) What is the electronegativity difference for the bond: a) 2.5 b) 3.5 c) 0.5 d) 1.0 81) What type of bond is the above bond? a) Non-polar covalent b) Polar covalent c) lonic d) Poodles