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From Wikipedia

Polar bond

In chemistry, a polar bond is a type of covalent bond between two atoms in which electrons are shared unequally. Because of this, one end of the molecule has a slight, relative negative charge and the other a slight, relative positive charge. For details, see:



From Yahoo Answers

Question:In a polar covalent bond, __________. (Points : 1) one atom takes an electron from another atom one atom is slightly more electronegative than another atom two atoms equally share an electron both atoms are equally electronegative 16. What is the primary difference between acids and bases? (Points : 1) Acids release hydroxide ions when they dissociate, but bases release hydrogen ions. Acids do not dissociate, but bases do. Acids release hydrogen ions when they dissociate, but bases release hydroxide ions. Both acids and bases release hydroxide during dissociation, but under different circumstances. 17. Ionic bonds are most likely to form between _____________. (Points : 1) metals metals and gases non-metals and gases non-metals and metals 18. An atomic number of 28 means that _____________. (Points : 1) an element has 28 protons an element has 28 neutrons the sum of the protons and neutrons is 28 the sum of the protons and electrons is 28 19. Which of these is generally the weakest kind of bond? (Points : 1) ionic bond covalent bond polar covalent bond hydrogen bond 20. A molecule of glycogen is combined with water and broken down into several molecules of glucose. What type of reaction is this? (Points : 1) hydrolysis dehydration synthesis condensation adhesion Can someone please help with my Biology homework ASAP? I'm completely stuck. Thanks.

Answers:15. B 16.C 17.D 18. A 19. D 20. A

Question:Does it dissolve? What about an ionic bond in a polar covalent or nonpolar covalent? what happens?

Answers:A single molecule can have both nonpolar and polar bonds; therefore, it is not recommended you talk about the interaction of different types of bonds to describe physical properties of different molecules. Instead just state that the molecule is either polar, nonpolar, or slightly polar. In any case, solubility will be more likely when the polarity of the two molecules are as closely related to each other. Nevertheless, a small amount should still go in solution.

Question:Why does HCl have a polar covalent bond when Cl2 doesn't?

Answers:HCl is a polar molecule because chlorine is more electronegative than Hydrogen which the electrons are not equally distributed within the molecule compared to Cl2 which is non-polar. The chlorine atoms are both pulling electrons on each side which results in no net force. Cl2 <-----Cl~Cl-----> equal distribution of electrons HCl <--H~Cl------> uneven distribution

Question:I tried to understand it in my science book but I just can't. Can someone tell me what an Ionic bond is. Explain so that a 5 year old can understand it. Can you also tell me the difference between a Covalent bond and a Polar Covalent bond? Note: it is about electronegativity Thanks in advance.

Answers:A polar covalent bond is a bond between two non-metals with different electronegativities. Only bonds between the same elements are truly nonpolar. The higher the difference in electronegativity, the more polar the bond is. Take a look at this table of electronegavities and let's try some examples. http://www.tutor-homework.com/Chemistry_Help/electronegativity_table/electronegativity.html consider the following bonds. They are arranged in order of increasing polarity: Cl-Cl H-C H-Cl H-O H-F We calculate the difference in electonegativity for each. I will use the absolute value because the sign is not important. The more electronegative atom is the negative side of the bond. Cl-Cl 2.55 - 2.55 = 0 it's not polar at all. H-C 2.1 - 2.55 = 0.45 it's barely polar H-Cl 2.1 - 3.16 = 1.06 more polar H-O 2.1 - 3.44 = 1.34 more polar again H-F 2.1 - 3.98 = 1.88 more polar than the rest

From Youtube

Polar & Nonpolar Covalent Bonds :EXTRA CREDIT ASSIGNMENT #2 Summer Bio1 Professor Revell Topic: Polar/Nonpolar Covalent Bonds

Polar Covalent Bonding :Check us out at www.tutorvista.com The polar covalent bond, called a polar bond for short, is a variation on the standard covalent bond. It is defined by a difference in electronegativity values of 0.4 or greater, the meaning of which shall be made clear below. All covalent bonds are polar to some extent unless the bond is between two atoms of the same element. It is best to start with a review of the standard covalent bond. This is the sharing of electrons between two elements in order to have 8 electrons in the outer shell. The only exception to this is Hydrogen, which is stable with 2 electrons in its outer shell. The structure of each element gives it a different electronegativity value. This value is effectively the strength of the pull of that atom's nucleus on the electrons around it. The higher the value the greater the pull. A covalent bond is electrons moving around two atoms; they are being shared. It is the difference between the electronegativity values that determines which atom gets the larger share of the electron's time. If the electrons spend more of their time around one atom out of the pair then that region will have more negative charge than the other atom. Carbon to Carbon Bond The first example is the standard Carbon to Carbon bond such as occurs in the alkane molecules. We are just considering the bond that these two atoms share without regard for any other bonds that this pair of atoms may be involved in. First we can draw the two atoms as shown ...