A student is testing the conductivity of two soild substances.Substance a has high conductivity and ?

Question

substance B has low conductivity.Based on this information, What must be true regarding these two substances? A.Electrons in substance A are able to move more easily than electrons in substance B B.there is more energy stored in chemical bonds in sub stance A than there is in substance B C.the atomic nuclei in substanceA have more mass than the atomic nuclei in substance B D.Substance A contains a higher percentage of radioactive atoms than does substance B.

Answer 1

A...assuming you mean electrical conductivity.

There are two types:

1. Electronic conductivity...current is carried by electrons flowing through the substance...more common in solids.

2. Ionic conductivity...current is carried by charged ions moving through...more common in solutions and/or molten salts.

None of the others is correct.

Answer 2

A. is the correct answer.  

Better conductivity results from  

Electrons are more labile  ( easier to move )

Bonding Strength is Lower  ( Less energy stored in Chemical Bonds )  

So ,  B. is not correct.  

Smaller Nuclei  ( = Less positive charges to attract electrons )  

Contain less Radioactive Nuclei  ( Which are Bigger Nuclei )  

So ,  C. and D. are not correct.  

Once you understand these logic ; Chemistry will be much easier.