How does one balance the following: ${}_{95}^{243}\mathrm{Am}$ ? ${}_{93}^{239}\mathrm{Np}$ ?

A) ${}_4^2\mathrm{He}$
B) ${}_2^4\mathrm{He}$
C) ${}_2^4\mathrm{H}$
D) ${}_4^2\mathrm{H}$

The number 8.03 contains how many significant figures?

A) 3
B) 2
C) 1
D) 4

Draw the major organic product generated in the reaction below. Pay particular attention to regio- and stereochemical detail.

In the decomposition reaction in which CaCO₃ breaks down to form CaO and CO₂, how can the rate of reaction be measured?

A) By the heat of the reaction
B) By the formation of CO₂ over time
C) By the number of moles of product
D) By the formation of CaCO₃ over time