Using hybridization theory to explain the electronic arrangements of ethane

sp3 hybridized.

Explanation:

All p orbitals are hybridized. Double or triple bonds (ethene and ethyne respectively) are only going to form if there are unhybridized p orbitals, in which they will be pi bonds rather than sigma bonds. sp3 hybridization gives ethene its shape. So basically, the s orbital and the p orbitals combine with each other. The bond angle will be 109.5 degrees. Instead of having one s orbital with two electrons and three p orbitals with only two electrons (one in two of the p orbitals), there will be four sp3 orbitals, and the electrons will rearrange to be in their own hybrid orbital.

im not exactly sure but i think its b!

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.