The conversion of large hydrocarbon molecules into smaller molecules is known as: a) catalytic or thermal cracking
b) catalytic reforming
c) None of these choices is correct.
d) fractional distillation

thermal cracking

Explanation:

Thermal cracking, also known as visbreaking, is an older process that capitalizes on heat and pressure to break large hydrocarbon molecules into smaller, light molecules. The more-modern and more-efficient technology is catalytic cracking.

Explanation:

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.