question: What kind of viscosity is found in long-chain hydrocarbons?
distractor3: intense viscosity
distractor1: increased viscosity
distractor2: low viscosity
correct_answer: highly viscous
support: There is also a correlation between viscosity and molecular shape. Liquids consisting of long, flexible molecules tend to have higher viscosities than those composed of more spherical or shorter-chain molecules. The longer the molecules, the easier it is for them to become “tangled” with one another, making it more difficult for them to move past one another. London dispersion forces also increase with chain length. Due to a combination of these two effects, long-chain hydrocarbons (such as motor oils) are highly viscous.