$9.$ Find out if the statement is true or false: Polymerization in the refining process refers to the chemical reaction where small molecules called monomers join together to form very large molecules, or polymers, which are typically used to produce synthetic rubbers and plastics.

$10.$ Find out if the statement is true or false: Isomerization in petroleum refining does not alter the hydrocarbon's carbon number but rearranges its molecular structure to improve the octane rating and vapor pressure characteristics of gasoline.

$11.$ Find out if the statement is true or false: Naphtha is primarily used as a solvent and a base for petrochemicals, rather than as a fuel, and is a lighter product of petroleum distillation, typically boiling between gasoline and kerosene cuts.

$12.$ Find out if the statement is true or false: Motor gasoline is a complex mixture of relatively volatile hydrocarbons, including both saturated and unsaturated chains, produced in a variety of formulations to meet seasonal and geographical performance requirements for modern engines.