Final answer:
Biofuel can be changed into gas or liquid fuels through processes such as cracking and reforming, followed by fractional distillation.
Step-by-step explanation:
One can change biofuel into gas or liquid fuels through a process called conversion, which involves breaking larger hydrocarbon chains into smaller ones (cracking), combining smaller chains into larger ones (unification), or rearranging molecules to create desired products (alteration). The first process used is cracking, where larger hydrocarbons are heated to high temperatures, causing carbon-carbon bonds to break and converting the compounds to lighter molecules similar to those in gasoline. The second process used is reforming, which converts straight-chain alkanes to either branched-chain alkanes or mixtures of aromatic hydrocarbons using metal catalysts. The mixtures of products obtained from cracking and reforming are then separated by fractional distillation.