Which common material is an example of a polyamide?

Nylon 6,6 is a common example of a polyamide.

Polyamides are polymers that contain repeating amide (-CO-NH-) linkages.

The structure of Nylon 6,6 is  

[-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-]_n

where n is a large number.

The numbers in the name showow that there are six carbon atoms on either side of an amide linkage.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.