Adding a neutron to an atom changes what property of the atom?
a. the charge
b. the volume
c. the atomic mass
d. the atomic number

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.