Which is a characteristic of super-absorbent polymers? a)when they absorb water, they become gels. b)they bind to water in stoichiometric ratios. c)they have a single water-absorbing monomer per molecule. d)each monomer is a salt of a carboxylic acid that repels water.

The correct answer is A.
Super absorbent polymers are those chemical compounds which has the ability to absorb great amount of water, they are often in powder form and when they absorb water, they become hydrogel. A typical super absorbent polymers can absorb an amount of water that is about 300 times its weight. Super absorbent polymers are usually used in the production of baby diapers, sanitary pads, adult protective underwear, etc.

Exothermic,  physical change after it is already baked