Name 2 important molecules?

Question

i need 2 important biological molecules that contain hydrogen bonds. and if @ all possible would some be generous enough 2 explain what is meant by saying that the sharing of electrons between atoms falls on a continuum from nonpolar covalent bonds to ionic bonds? thankz a million 2 those of u who answer! i need these anwsers badly!

Answer 1

DNA contains hydrogen bonds holding the two strands together.

Protein also contains hydrogen bonds, helping to determine the secondary structure.

In chemistry, each atom is trying to get a noble gas electron configuration.  That means that all atoms which are not noble gases need to gain or lose electrons to imitate them.

Let's take sodium chloride as an example of an ionic bond.  The chlorine atom needs to gain an electron to simulate argon.  The sodium atom needs to lose an electron to simulate neon.  The outer shell electron which sodium loses is quite loosely held and is shed easily.  The chlorine atom readily accepts it and the bond is very ionic.  However, if you had lithium iodide, this is also ionic, but the lithium finds it a little harder to lose its electron and the bromine does not accept it quite as readily, so although this is still an ionic bond, the electron is slightly nearer the lithium that the other is to the sodium.

The bond between carbon and hydrogen in methane is covalent in that the two share the electron.  The carbon wants the electron slightly more than the hydrogen, so whereas this is a covalent bond, the carbon gets a slightly greater share of it.

Meanwhile with a diatomic gas like oxygen, O2, both atoms want the shared electrons as much as each other, so the bond is purely covalent.

It's all to do with the electronegativity of the two atoms being bonded.  The greater it is, the more polar/ionic the bond becomes.  The less the difference, the more covalent/non-polar the bond is.  One definition says that if the difference in electronegativity of the two atoms in the bond is >1.7, it's ionic.  As you can see, though, the difference will vary with the atoms in the bond, so is on a continuum.

To find the electronegativity of any element, click on it on this table:

http://www.webelements.com/electronegati...

Answer 2

Theyre talking about the van der Waals force.

http://en.wikipedia.org/wiki/Van_der_Waa...

H2O and DNA both have hydrogen bonds.

Answer 3

All proteins have hydrogen bonds helping to maintain the folding of the molecule in its proper form.

DNA (deoxyribonucleic acid) is composed of two molecules held together by hydrogen bonds between the nucleotides.

As to the continuum of sharing electrons, the electrons are constantly moving within the molecule.  At times it may be held more closely to one of the atoms of the molecule.  Water is a good example of a polar covalent bond molecule carrying slight positive and negative charges due to the unequal sharing of the electrons.  That is my take on the statement.