1)the total length of a non-straight path between two points regardless of direction. a. displacement b. distance
c. motion d. reference point

2)the total length of a non-straight path between two points regardless of direction.

a. displacement b. distance
c. motion d. reference point​

Ido not understand. 

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.