Electronegativity - Polarity ( Bond Angles)

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    I really don't understand how you would draw the molecules e.g different lines for example the ones that have bond lines and the ones that come out the paper etc... how do you know which lines to use .Also how do you know which angles to use ? Thanks
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    (Original post by nisha.sri)
    I really don't understand how you would draw the molecules e.g different lines for example the ones that have bond lines and the ones that come out the paper etc... how do you know which lines to use .Also how do you know which angles to use ? Thanks
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    (Original post by Kvothe the Arcane)
    Legit. Takes practice. It's hard to symbolise 3D structure on 2D paper.Just have to get used to the narrative
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    (Original post by Kvothe the Arcane)
    But how do you know which to use and how the structure will look like ? Sorry i missed a lesson and i'm clueless

    (Original post by 303Pharma)
    Legit. Takes practice. It's hard to symbolise 3D structure on 2D paper.Just have to get used to the narrative
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    (Original post by nisha.sri)
    But how do you know which to use and how the structure will look like ? Sorry i missed a lesson and i'm clueless
    Try molecular modelling kits. Like https://www.amazon.co.uk/Koly-Scient...hemistry+balls

    Helps visualisation.
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    (Original post by 303Pharma)
    Try molecular modelling kits. Like https://www.amazon.co.uk/Koly-Scient...hemistry+balls

    Helps visualisation.
    I mean how do you know how to draw different molecules ? And how do you know what angles to use ?
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    Are you familiar with VSERP?
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    (Original post by nisha.sri)
    I mean how do you know how to draw different molecules ? And how do you know what angles to use ?

    Just draw the bonds spaced evenly around the atom, and coming in or out if nessecary.
    Angle depends on number of pairs of electrons (lone pairs repel more by 2.5 degrees)
    2 pairs = 180
    3 pairs = 120
    4 pairs = 109
    6 pairs = 90
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    (Original post by james813)
    Just draw the bonds spaced evenly around the atom, and coming in or out if nessecary.
    Angle depends on number if pairs of electrons (lone pairs repel more by 2.5 degrees)
    2 pairs = 180
    3 pairs = 120
    4 pairs = 109
    6 pairs = 90
    Math Geek got activated please don't do that. Can you explainer in more detain?. .
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    (Original post by 303Pharma)
    Math Geek got activated please don't do that. Can you explainer in more detain?. .
    So you want to find a bond angle, first count how many electron pairs around the central atom. Then use the corresponding angle above. If there are both lone pairs and bonding pairs, each bonding pair will repel less by 2.5 degrees. Hope that helps.
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    In an exam, I don't believe you actually need to use the wedged and dotted lines when drawing structures. As long as you draw the correct number of bonds/lone pairs and label the bond angles, you're good to go.
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    (Original post by james813)
    So you want to find a bond angle, first count how many electron pairs around the central atom. Then use the corresponding angle above. If there are both lone pairs and bonding pairs, each bonding pair will repel less by 2.5 degrees. Hope that helps.
    Ah thanks Can you give me an example
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    I used to always get muddled up with this and still do. Especially when drawing mirror images etc
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    (Original post by 303Pharma)
    Are you familiar with VSERP?
    No what's that ?
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    (Original post by nisha.sri)
    Ah thanks Can you give me an example

    No, but Google can.
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    (Original post by nisha.sri)
    No what's that ?
    Google search. Like two seconds. You dint't hit an answer?
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    (Original post by nisha.sri)
    No what's that ?
    Valence Shell Electro Repulsive Theory. It's the standard model for describing, at the molecular level, the shape and structure of atomic / molecular bonds.
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    bnmbnm
 
 
 
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