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Top competitors on query "why do polar covalent bonds form hydrogen bonds"
http://catalog.flatworldknowledge.com/bookhub/4309?e=averill_1.0-ch08_s05 Competition: low
Solution: The Lewis electron structure for the NH4+ ion is as follows: The nitrogen atom shares four bonding pairs of electrons, and a neutral nitrogen atom has five valence electrons. The Lewis electron structure is drawn within brackets as is customary for an ion, with the overall charge indicated outside the brackets, and the bonding pair of electrons is indicated by a solid line
Why is HCl a covalent compound? - Yahoo! Answers India
http://in.answers.yahoo.com/question/index?qid=20071225212142AAtqjUe Competition: low
Member since: 07 March 2006 Total points: 744 (Level 2) Add Contact Block Best Answer - Chosen by Voters Well, it is covalent because it is a bond between Chlorine (a non-metal) and Hydrogen (acting as a non-metal). So it is possible to have nonmetals that are found in ammonium, nitrogen and hydrogen, in the form of NH4 with a positive charge, combined with anions that are negatively charged and have an ionic compound and still have no metals atoms contained in it
http://ocw.mit.edu/courses/chemistry/5-111-principles-of-chemical-science-fall-2008/video-lectures/lecture-10/ Competition: low
So it looks like not too many more than half of you got this correct, so make sure you can look at your periodic table and figure out how to think about ionization energy in terms of z effective, not just in terms of memorizing what that trend is. There are some exceptions, which we'll get to later, but the only a big exception here is with hydrogen, which has a special stability that's associated with two electrons
http://www.college-cram.com/study/chemistry/chemical-bonds/polar-and-non-polar-bonds/ Competition: low
(See the illustration in the tutorial above for more details.) Hydrogen Bonds When hydrogen fors a polar molecule with nitrogen, oxygen, or fluorine (all highly electronegative elements), the resulting molecule tends to be slightly positive on the hydrogen side. Van der Waals Forces Even in non-polar molecules, the fact that electrons are constantly in motion means that areas of the molecule can temporarily become slightly positive or negative
Yahoo! Answers - How do you tell if a bond is polar or nonpolar?
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6 years ago Report Abuse by Dulitha Member since: January 24, 2008 Total points: 633 (Level 2) Add Contact Block Best Answer - Chosen by Voters In order to find if a certain element is polar or non polar, You need to calculate its polarity
http://www.elmhurst.edu/~chm/vchembook/161Ahydrogenbond.html Competition: low
The hydrogen, which has a partial positive charge tries to find another atom of oxygen or nitrogen with excess electrons to share and is attracted to the partial negative charge. Negative electrostatic potential corresponds to a attraction of the proton by the concentrated electron density in the molecules (from lone pairs, pi-bonds, etc.) (colored in shades of red)
Covalent Bonds - Molecular Cell Biology - NCBI Bookshelf
http://www.ncbi.nlm.nih.gov/books/NBK21595/ Competition: low
(In an alternative form, called the boat, both carbon 1 and carbon 4 lie above the plane (more...)The L isomers of sugars are virtually unknown in biological systems except for L-fucose. Rather, sugar molecules adopt a conformation in which each of the ring carbons is at the center of a tetrahedron, just like the carbon in methane (see Figure 2-2)
Why do ionic bonds break when dissolved in water? - Yahoo! Answers India
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Solubility may also strongly depend on the presence of other species dissolved in the solvent, for example, complex-forming anions (ligands) in liquids. The last two effects, although of great practical importance, are not true solubility effects because true solubility occurs at equilbrium, which requires a perfect monocrystal
http://www.ausetute.com.au/bondpola.html Competition: low
Oxygen is the more electronegative so it will have a greater share of the bonding electrons and therefore a partial negative charge, O Hydrogen is less electronegative so it will have a lesser share of the bonding electrons and therefore a partial positive charge, H Since the bond has two 'poles' or 'ends' it is sometimes referred to as a dipole. F has such a strong attraction for electrons that it pulls the electron off the Na resulting in a negative charge for fluorine, F-, and a positive charge for sodium, Na+ The bond between Na+ and F- is NOT covalent since the bonding electrons are not shared between the 'atoms'
http://www.adichemistry.com/general/chemicalbond/covalentbond/covalent-bond.html Competition: low
* In the formation of Ammonia molecule, the nitrogen atom contributes 3 of its valence electrons to form three bond pairs which are shared with hydrogen atoms. * In the formation of water molecule, the oxygen atom contributes two of its valence electrons to form two bond pairs that are shared with two hydrogen atoms separately
Hydrogen bond - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Hydrogen_bond Competition: low
Because of the small size of hydrogen relative to other atoms and molecules, the resulting charge, though only partial, represents a large charge density. The density of ice is less than the density of water at the same temperature; thus, the solid phase of water floats on the liquid, unlike most other substances
http://staff.jccc.net/pdecell/chemistry/bonds.html Competition: low
Indeed the sorts of so called hydrophilic and hydrophobic interactions water has with varios organic compounds depend on the nature of the polar covalent bond in water. VBS Home page,VBS Course Navigator, Basic chemistry, Chemical bonds, Previous Page, Next Page,top of page Covalent bonds involve a complete sharing of electrons and occurrs most commonly between atoms that have partially filled outer shells or energy levels
http://academic.brooklyn.cuny.edu/biology/bio4fv/page/covalenb.htm Competition: low
For biological purposes there are several things to remember about covalent bonds Covalent bonds represent chemical potential energy that can be used in biological reactions. In Biological systems, polar covalent bonds are important because these kinds of bonds allow the formation of another kind of weak bond called a hydrogen bond
Hydrogen Bonds
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/H/HydrogenBonds.html Competition: low
However, when many hydrogen bonds can form between two molecules (or parts of the same molecule), the resulting union can be sufficiently strong as to be quite stable. The energy required to break multiple hydrogen bonds causes water to have a high heat of vaporization; that is, a large amount of energy is needed to convert liquid water, where the molecules are attracted through their hydrogen bonds, to water vapor, where they are not
http://hyperphysics.phy-astr.gsu.edu/hbase/Chemical/bond.html Competition: low
If the hydrogen is close to another oxygen, fluorine or nitrogen in another molecule, then there is a force of attraction termed a dipole-dipole interaction. Their strength indicates that the atoms are difficult to separate, but malleability and ductility suggest that the atoms are relatively easy to move in various directions
http://www.wyzant.com/help/science/chemistry/bonds Competition: low
Polar covalent bonds often indicate polar molecules, which are likely to bond with other polar molecules but are unlikely to bond with non-polar molecules. There are several different kinds of bonds; the type of bond seen in elements and compounds depends on the chemical properties as well as the attractive forces governing the atoms and molecules
Why does H2S, HBr and HCl do not form hydrogen bonds? - Yahoo!7 Answers
http://au.answers.yahoo.com/question/index?qid=20080911030257AAf2o1b Competition: low
5 years ago Report Abuse 3 people rated this as good Asker's Rating: Asker's Comment: Thanks 0 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo!7 Add to Del.icio.us RSS There are currently no comments for this question
http://answers.yahoo.com/question/index?qid=20071212123044AA2Yx8t Competition: low
This means that fluorine has a huge amount of pull on the electrons from carbon, making the electrons more likely to be around fluorine rather than carbon, producing a polar covalent bond. 6 years ago Report Abuse 3 people rated this as good Asker's Rating: Asker's Comment: totally answered the question, thanks :) 3 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo! Add to Del.icio.us RSS There are currently no comments for this question
How do covalent bonds form
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Ionic bonds can form a crystal lattice, but usual Why do multiple covalent bonds form? multiple covalent bonds form to attain a noble gas configuration by sharing more than one pair of el Does potassium form covalent bonds? No, it forms only ionic bonds. Hydrogen joins oxygen because it wants to get rid of its valence cell, so another joins in so oxygen can get a full shell and they all can live together in the valence shell
http://answers.yahoo.com/question/index?qid=20080102224502AAoJnIE Competition: low
A molecule can have a difference greater then .5 and be non-polar if it is symmetric like carbon dioxide, the difference between carbon and oxygen is 1 but the two oxygen atoms perfectly off-set each other. That extra set of electrons are also looking for a perfect octet and creating dipoles in what would other wise be a non polar symmetric molecule with out them, like carbon-dioxide
http://uk.answers.yahoo.com/question/index?qid=20100125110034AAFTMJk Competition: low
A simple view of covalent bonding The importance of noble gas structures At a simple level (like GCSE) a lot of importance is attached to the electronic structures of noble gases like neon or argon which have eight electrons in their outer energy levels (or two in the case of helium). Some very simple covalent molecules Chlorine For example, two chlorine atoms could both achieve stable structures by sharing their single unpaired electron as in the diagram
Solution: The Lewis electron structure for the NH4+ ion is as follows: The nitrogen atom shares four bonding pairs of electrons, and a neutral nitrogen atom has five valence electrons. The Lewis electron structure is drawn within brackets as is customary for an ion, with the overall charge indicated outside the brackets, and the bonding pair of electrons is indicated by a solid line
Why is HCl a covalent compound? - Yahoo! Answers India
Member since: 07 March 2006 Total points: 744 (Level 2) Add Contact Block Best Answer - Chosen by Voters Well, it is covalent because it is a bond between Chlorine (a non-metal) and Hydrogen (acting as a non-metal). So it is possible to have nonmetals that are found in ammonium, nitrogen and hydrogen, in the form of NH4 with a positive charge, combined with anions that are negatively charged and have an ionic compound and still have no metals atoms contained in it
So it looks like not too many more than half of you got this correct, so make sure you can look at your periodic table and figure out how to think about ionization energy in terms of z effective, not just in terms of memorizing what that trend is. There are some exceptions, which we'll get to later, but the only a big exception here is with hydrogen, which has a special stability that's associated with two electrons
(See the illustration in the tutorial above for more details.) Hydrogen Bonds When hydrogen fors a polar molecule with nitrogen, oxygen, or fluorine (all highly electronegative elements), the resulting molecule tends to be slightly positive on the hydrogen side. Van der Waals Forces Even in non-polar molecules, the fact that electrons are constantly in motion means that areas of the molecule can temporarily become slightly positive or negative
Yahoo! Answers - How do you tell if a bond is polar or nonpolar?
6 years ago Report Abuse by Dulitha Member since: January 24, 2008 Total points: 633 (Level 2) Add Contact Block Best Answer - Chosen by Voters In order to find if a certain element is polar or non polar, You need to calculate its polarity
The hydrogen, which has a partial positive charge tries to find another atom of oxygen or nitrogen with excess electrons to share and is attracted to the partial negative charge. Negative electrostatic potential corresponds to a attraction of the proton by the concentrated electron density in the molecules (from lone pairs, pi-bonds, etc.) (colored in shades of red)
Covalent Bonds - Molecular Cell Biology - NCBI Bookshelf
(In an alternative form, called the boat, both carbon 1 and carbon 4 lie above the plane (more...)The L isomers of sugars are virtually unknown in biological systems except for L-fucose. Rather, sugar molecules adopt a conformation in which each of the ring carbons is at the center of a tetrahedron, just like the carbon in methane (see Figure 2-2)
Why do ionic bonds break when dissolved in water? - Yahoo! Answers India
Solubility may also strongly depend on the presence of other species dissolved in the solvent, for example, complex-forming anions (ligands) in liquids. The last two effects, although of great practical importance, are not true solubility effects because true solubility occurs at equilbrium, which requires a perfect monocrystal
Oxygen is the more electronegative so it will have a greater share of the bonding electrons and therefore a partial negative charge, O Hydrogen is less electronegative so it will have a lesser share of the bonding electrons and therefore a partial positive charge, H Since the bond has two 'poles' or 'ends' it is sometimes referred to as a dipole. F has such a strong attraction for electrons that it pulls the electron off the Na resulting in a negative charge for fluorine, F-, and a positive charge for sodium, Na+ The bond between Na+ and F- is NOT covalent since the bonding electrons are not shared between the 'atoms'
* In the formation of Ammonia molecule, the nitrogen atom contributes 3 of its valence electrons to form three bond pairs which are shared with hydrogen atoms. * In the formation of water molecule, the oxygen atom contributes two of its valence electrons to form two bond pairs that are shared with two hydrogen atoms separately
Hydrogen bond - Wikipedia, the free encyclopedia
Because of the small size of hydrogen relative to other atoms and molecules, the resulting charge, though only partial, represents a large charge density. The density of ice is less than the density of water at the same temperature; thus, the solid phase of water floats on the liquid, unlike most other substances
Indeed the sorts of so called hydrophilic and hydrophobic interactions water has with varios organic compounds depend on the nature of the polar covalent bond in water. VBS Home page,VBS Course Navigator, Basic chemistry, Chemical bonds, Previous Page, Next Page,top of page Covalent bonds involve a complete sharing of electrons and occurrs most commonly between atoms that have partially filled outer shells or energy levels
For biological purposes there are several things to remember about covalent bonds Covalent bonds represent chemical potential energy that can be used in biological reactions. In Biological systems, polar covalent bonds are important because these kinds of bonds allow the formation of another kind of weak bond called a hydrogen bond
Hydrogen Bonds
However, when many hydrogen bonds can form between two molecules (or parts of the same molecule), the resulting union can be sufficiently strong as to be quite stable. The energy required to break multiple hydrogen bonds causes water to have a high heat of vaporization; that is, a large amount of energy is needed to convert liquid water, where the molecules are attracted through their hydrogen bonds, to water vapor, where they are not
If the hydrogen is close to another oxygen, fluorine or nitrogen in another molecule, then there is a force of attraction termed a dipole-dipole interaction. Their strength indicates that the atoms are difficult to separate, but malleability and ductility suggest that the atoms are relatively easy to move in various directions
Polar covalent bonds often indicate polar molecules, which are likely to bond with other polar molecules but are unlikely to bond with non-polar molecules. There are several different kinds of bonds; the type of bond seen in elements and compounds depends on the chemical properties as well as the attractive forces governing the atoms and molecules
Why does H2S, HBr and HCl do not form hydrogen bonds? - Yahoo!7 Answers
5 years ago Report Abuse 3 people rated this as good Asker's Rating: Asker's Comment: Thanks 0 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo!7 Add to Del.icio.us RSS There are currently no comments for this question
This means that fluorine has a huge amount of pull on the electrons from carbon, making the electrons more likely to be around fluorine rather than carbon, producing a polar covalent bond. 6 years ago Report Abuse 3 people rated this as good Asker's Rating: Asker's Comment: totally answered the question, thanks :) 3 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo! Add to Del.icio.us RSS There are currently no comments for this question
How do covalent bonds form
Ionic bonds can form a crystal lattice, but usual Why do multiple covalent bonds form? multiple covalent bonds form to attain a noble gas configuration by sharing more than one pair of el Does potassium form covalent bonds? No, it forms only ionic bonds. Hydrogen joins oxygen because it wants to get rid of its valence cell, so another joins in so oxygen can get a full shell and they all can live together in the valence shell
A molecule can have a difference greater then .5 and be non-polar if it is symmetric like carbon dioxide, the difference between carbon and oxygen is 1 but the two oxygen atoms perfectly off-set each other. That extra set of electrons are also looking for a perfect octet and creating dipoles in what would other wise be a non polar symmetric molecule with out them, like carbon-dioxide
A simple view of covalent bonding The importance of noble gas structures At a simple level (like GCSE) a lot of importance is attached to the electronic structures of noble gases like neon or argon which have eight electrons in their outer energy levels (or two in the case of helium). Some very simple covalent molecules Chlorine For example, two chlorine atoms could both achieve stable structures by sharing their single unpaired electron as in the diagram
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