$5.$ Find out if the statement is true or false: Catalytic cracking, unlike thermal cracking, uses a catalyst to lower the temperature and pressure requirements of the cracking process, thereby improving the efficiency and yield of lighter petroleum products such as ethylene and propylene.

$6.$ Find out if the statement is true or false: Hydrocracking combines the presence of hydrogen gas, high pressure, and a catalyst to not only break down large hydrocarbon molecules but also to saturate them with hydrogen, making the process distinct from other forms of cracking.

$7.$ Find out if the statement is true or false: Reforming, both thermal and catalytic, is used in petroleum refineries to convert low$-$octane hydrocarbons into high$-$octane reformate, which is then blended into gasoline to improve its octane rating and combustion quality.

$8.$ Find out if the statement is true or false: Alkylation in petroleum refining involves combining olefins and isobutanes in the presence of a strong acid catalyst to form alkylate, a high$-$octane component crucial for blending into aviation fuel.