Question 11

molecules have a positive area and a negative area.

a)polar

b)nonpolar

c)organic

d)gaseous

Polar molecules have a positive and a negative area.

Explanation:

Polar molecules contain polar bonds because of the difference in electronegativity between the arms that are bonded. These molecules are net dipole because of opposing charges.  

An example of a polar molecule is water. It has both positive and negative charges on each side. The dipole in water does not cancel. Thus, making water like a net dipole molecule. Because of the polar nature of water, other polar molecules dissolve in water.  

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: