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anonymous

  • one year ago

Determine the electronegativity between the atoms of each molecule. Identify the bond as either ionic or covalent. State whether the molecule is polar or non polar. Identify the structure as having hydrogen bonding, dipole-dipole moments or London dispersion forces (LDF).

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  1. anonymous
    • one year ago
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    i need these 4 questions for 4 elements: H2O, NH3, CH4, and CO2

  2. taramgrant0543664
    • one year ago
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    An ionic bond is formed when one atom accepts or donates one or more of its valence electrons to another atom. A covalent bond is formed when atoms share valence electrons. The atoms do not always share the electrons equally, so a polar covalent bond may be the result.

  3. anonymous
    • one year ago
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    so which element has covalent bonds?

  4. anonymous
    • one year ago
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    i think all of them

  5. anonymous
    • one year ago
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    It'll probably help to look at the Lewis structures of these compounds, as well as an electronegativity chart (all of which you can find online).

  6. taramgrant0543664
    • one year ago
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    The ones with covalent bonds are the ones that share their electrons

  7. anonymous
    • one year ago
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    so all of them?

  8. anonymous
    • one year ago
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    i already have all the lewis structures in front of me

  9. taramgrant0543664
    • one year ago
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    Yes all are covalent bonds of some sort

  10. anonymous
    • one year ago
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    ok, and im really having trouble with the electronegativity, how do i calculate that

  11. taramgrant0543664
    • one year ago
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    The electronegativity can be found on the periodic table and you subtract the lower one from the higher one

  12. anonymous
    • one year ago
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    so subtract the atomic number from atomic mass?

  13. taramgrant0543664
    • one year ago
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    No there is a Number on the back of the periodic table that is the electronegativity of the element you can also search it too

  14. anonymous
    • one year ago
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    and then subtract the electronegativity from the atomic number?

  15. taramgrant0543664
    • one year ago
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    No you subtract the electronegativities between the two elements

  16. anonymous
    • one year ago
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    im lost.. could you do an example? what two elements are you talking abuit

  17. taramgrant0543664
    • one year ago
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    HF H has an electronegativity of 2.20 F has an electronegativity of 3.98 3.98-2.20=1.78

  18. anonymous
    • one year ago
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    ohhh so you always subtract the lesser from the larger? or can you get a negative

  19. taramgrant0543664
    • one year ago
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    I don't think there should be a negative i'm pretty sure it is always larger minus smaller

  20. anonymous
    • one year ago
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    ok give me a sec to do all 4

  21. Abhisar
    • one year ago
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    If \(\sf \Delta EN>1.7\), then the bond must be ionic. For deciding whether the molecule is polar or not, you need to consider the geometry of molecule. If it is symmetrical then its non-polar otherwise polar. Ih any molecule has a hydrogen atom attached to highly electronegative elements like N, O or F, then there are greater chances of hydrogen bonding.

  22. anonymous
    • one year ago
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    H2O: Polar CO2: Nonpolar CH4: Nonpolar NH3: Polar im pretty sure im correct

  23. Abhisar
    • one year ago
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    Example, \(\sf NH_3\) EN of N is 3.04 EN of H is 2.2 \(\sf \Delta EN=3.04-2.2=0.84<1.7\) so the bonds will be covalent

  24. anonymous
    • one year ago
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    they're all covalent

  25. Abhisar
    • one year ago
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    |dw:1440641172502:dw|

  26. anonymous
    • one year ago
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    EN of H2O is 1.24?

  27. Abhisar
    • one year ago
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    EN is for a element.

  28. anonymous
    • one year ago
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    oh, i meant 1.24 is what i got after i subtactred them

  29. Abhisar
    • one year ago
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    NH3 has a tetrahedral structure with a lone pair, thus it is unsymmetrical and hence has a dipole moment which makes it a polar molecule.

  30. anonymous
    • one year ago
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    i see

  31. Abhisar
    • one year ago
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    For \(\sf H_2O\) there are 2 O-H bonds, you need to see if O-H bond is ionic or covalent. \(\sf \Delta EN = 3.44-2.2=?\)

  32. Abhisar
    • one year ago
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    I need to leave now, I'll be back in a hour or so. I'll request @taramgrant0543664 to help you further c:

  33. taramgrant0543664
    • one year ago
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    Yes you were correct about which ones are polar and non polar ones

  34. anonymous
    • one year ago
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    ok, and i was correct about them all being covalent right

  35. taramgrant0543664
    • one year ago
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    Yes they are only polar and non-polar if they are also covalent

  36. anonymous
    • one year ago
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    and i did the calculations and this is what i got H2O: 1.24 CO2: 0.89 CH4: 0.35 NH3: 0.84

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