1.
please help with these 2 questions, thank you
1) The atoms in a nuclear reaction ________________
a. cannot be balanced as in the other reaction types.
b. Are balanced like any other reaction type.
c. depend on the speed of light to determine the atoms that are produced in the reaction
d. are conserved.
2) A sample of a piece of wood from a cliff dwelling in the southwest was analyzed for Carbon -
14 content. What is a critical assumption(s) in this type of analysis?
a. The decay rate of C14 is stable and does not change over time.
b. The Carbon 12Â to Carbon 14Â ratio is stable over time.
c. The exchange of Carbon-12 and Carbon 14 stops when the tree producing the sample of
wood died.
d. All of the answers are assumptions that must be true for the analysis to be accurate.
Solution
1.
(a) Cannot be balanced as in the other reaction types.
But , in nuclear reactions,
Total mass nmber of reactants = Total mass number of products.
Total atomic number of reactants = Total atomic number of products.

2.
2.
(d) all are true
a. The decay rate of C14 is stable and does not change over time.
b. The Carbon 12 to Carbon 14 ratio is stable over time.
c. The exchange of Carbon-12 and Carbon 14 stops when the tree producing the sample of wood
died.