The portal has been deactivated. Please contact your portal admin.

Question Video: Identifying the Main Reason for Using Oil over Plastic to Protect a Bicycle Chain Chemistry • 10th Grade

What is the main reason for preferring oil over plastic as a protective coating for a steel bicycle chain?

02:15

Video Transcript

What is the main reason for preferring oil over plastic as a protective coating for a steel bicycle chain? (A) The oil layer reduces oxidation by acting as a sacrificial coating. (B) Oil is less expensive than a plastic coating. (C) Oil can spread to maintain a uniform coating during movement of the chain. (D) Oil is less likely to react with the steel chain. Or (E) oil is less heavy than plastic so is less likely to impede the chain movement.

A steel bicycle chain works because the links can move as the chain fits neatly over the teeth of the moving gears. A steel bicycle chain can easily rust because of the iron in steel. If a steel bicycle chain rusts, it will change shape, parts will wear away more quickly, and the links may stick together, causing the chain to stop working entirely. We want to stop that from happening.

Corrosion and rusting occur when the steel is exposed to oxygen and water. So to prevent corrosion, we must create a physical barrier that prevents the steel from coming in contact with oxygen and water. We can coat metal parts in various ways to form a physical barrier. The two options given as a protective coating in this question are oil and plastic.

Covering the steel bicycle chain with plastic can be impractical, as the plastic will prevent the chain from moving and would likely wear away quickly. The plastic also might chip and break as the chain moves. Perhaps the simplest way of forming a barrier against corrosion for the steel bicycle chain is to coat it with oil. This forms a temporary barrier that is cheap and can be reapplied when needed. Oil will stick to the surface for much longer and can spread to form a uniform coating as the chain moves. Therefore, the main reason for preferring oil over plastic as a protective coating for a steel bicycle chain is (C); oil can spread to maintain a uniform coating during movement of the chain.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.