examples of non polar covalent bond
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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.
consider the following bonds. They are arranged in order of increasing polarity:
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
Question:I'm studying for finals, but I'm confused about these two things. I know a Covalent Bond is a bond between two non-metals. but isn't a polar covalent bond a bond between two metals also? Please make the answer as easy to understand as possible.. I'm putting coutless hours into studying and thats the last thing i want to do is read a bunch of paragraphs.. something very small and easy to understand please. five stars for best answer.
Answers:A covalent bond is a bond where the charges on the atoms in the bond cancel each other out. A polar covalent bond is a covalent bond but the atoms have charges, for example: water. The two hydrogens have a polar positive charge and oxygen has a negative charge.
Question:an ionic bond to me please? Also, if you know how an acid is different from a base, that would be great too, thanks :)
I know the BASICS of these answers already, like an acid releases a H+ and an anion I believe and a base releases an OH- and a cation, right? but why and how? I need a more IN DEPTH answer, please.
Answers:I already sent this to you in an email but I will post it here too.
An acid will usually release H+ ions. The concentration of H+ ions in a solution is what actually determines the pH, the higher the H+ concentration, the lower the pH. an acid will have a pH lower than 7, a base higher than 7, aand a neutral substance will have a pH of 7. A base will usually release OH- ions. This is why an acid and a base can cancel each other out. The H+ ions will combine with the OH- ions to form H2O. The way they release the ions is called dissociation, which just means breaking down, which an molecule will often do in the presence of other substances, or in high or low heat, etc. The reasons that compounds will break down in the presence of other substances are vast and varied. I will not explain them all here because that would take forever. Also, there are actually acids and bases that don't release H+ of OH- ions as well but I'm not sure what level you are at and whether you need to know about that.
Polar covalent bonds are bonds in which the electrons have more affinity for a certain atom in a molecule due to what is called electronegativity which is basically the ability of an atom of molecule to attract electrons. For example, in a water molecule, oxygen is much more electronegative than hydrogen so the electrons tend to spend more time around the oxygen atom. This creates creates a negative charge surrounding the oxygen and a positive charge surrounding the hydrogen and this is why water molecules attract each other because the polarity can work like a magnet. If you notice when water hits a windshield, the water droplets will often flow together. This article in wikipedia can show you on the periodic table which atoms are the most electronegative and you can predict when a polar covalent bond will form by whether or not the atoms have an imbalance of electronegativity.
A non-polar covalent bond is a bond that occurs when the atoms have similar electronegativity, and therefore there is no unequal sharing of electrons.
Ionic bonds are bonds in which the electrons are transferrered from one atom to another. There is no sharing involved. This usually occurs between a metal and a non-metal. An example would be NaCl.
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 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)
polar covalent 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)
Can someone please help with my Biology homework ASAP? I'm completely stuck.
Answers:15. B 16.C 17.D 18. A 19. D 20. A
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 ...
Chemistry: Covalent Bonds and Polar Bonds :Watch more free lectures and examples of Chemistry at www.educator.com Other subjects include Algebra, Trigonometry, Calculus, Biology, Physics, Statistics, and Computer Science. -All lectures are broken down by individual topics -No more wasted time -Just search and jump directly to the answer