CHM 123
In class worksheet
NAME_________________________
1. Write the series of nuclear equations to represent the bombardment of Al-27 with a neutron to form a
product that subsequently undergoes an alpha decay followed by a beta decay
2. A rock from Australia contains 0.438 g of Pb-206 to every 1.00g of U-238. Assuming that the rock did not
contain any Pb-206 at the time of its formation, how old is the rock?
Answer: 2.6 x109 yr
3. The mass of a neon-20 atom is 19.99244 amu. Calculate its mass defect and nuclear binding energy in
MeV/mol
Answer: 5.44 x 1011J/mol
4. Complete the following nuclear equation and calculate the energy change (in J/mol reactant)
*complete the equation
Mass defect = mass products – mass reactant
5. Complete the following table
Molecule Lewis formula
Electronic
geometry
SF5-
Molecular
shape
Hybridization
at the central
atom(s)
Ideal
angle(s)
Molecular
polarity
Strongest
IMF