Pure water is a poor conductor of electricity. when sodium chloride (nacl) is dissolved in water, however, the solution becomes a good conductor of electricity. which of the following statements explains this change in conductivity?
a. the nacl dissociates into na+ and cl- ions, which are able to carry the charge. b. the nacl breaks down the water molecules creating charged oxygen and hydrogen ions.
c. the nacl molecule changes and becomes a covalent bond when dissolved in water.
d. the nacl reacts with water to form the electrically charged compounds hcl and na2o.

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.