Hey there! Sign in to join this conversationNew here? Join for free

Electronegativity - Polarity ( Bond Angles) Watch

Announcements
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    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
    • TSR Support Team
    • Very Important Poster
    • Reporter Team
    • Welcome Squad
    Offline

    19
    ReputationRep:
    (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
    Offline

    3
    ReputationRep:
    (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
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    (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
    Offline

    3
    ReputationRep:
    (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.
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    (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 ?
    Offline

    3
    ReputationRep:
    Are you familiar with VSERP?
    Offline

    16
    ReputationRep:
    (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
    Offline

    3
    ReputationRep:
    (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?. .
    Offline

    16
    ReputationRep:
    (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.
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    (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
    Offline

    3
    ReputationRep:
    I used to always get muddled up with this and still do. Especially when drawing mirror images etc
    • Community Assistant
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by 303Pharma)
    Are you familiar with VSERP?
    No what's that ?
    Offline

    16
    ReputationRep:
    (Original post by nisha.sri)
    Ah thanks Can you give me an example

    No, but Google can.
    Offline

    3
    ReputationRep:
    (Original post by nisha.sri)
    No what's that ?
    Google search. Like two seconds. You dint't hit an answer?
    Offline

    3
    ReputationRep:
    (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.
    Offline

    16
    ReputationRep:
    bnmbnm
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Break up or unrequited love?
    Help with your A-levels

    All the essentials

    The adventure begins mug

    Student life: what to expect

    What it's really like going to uni

    Rosette

    Essay expert

    Learn to write like a pro with our ultimate essay guide.

    Uni match

    Uni match

    Our tool will help you find the perfect course for you

    Study planner

    Create a study plan

    Get your head around what you need to do and when with the study planner tool.

    Study planner

    Resources by subject

    Everything from mind maps to class notes.

    Hands typing

    Degrees without fees

    Discover more about degree-level apprenticeships.

    A student doing homework

    Study tips from A* students

    Students who got top grades in their A-levels share their secrets

    Study help links and info

    Can you help? Study help unanswered threadsRules and posting guidelines

    Sponsored content:

    HEAR

    HEAR

    Find out how a Higher Education Achievement Report can help you prove your achievements.

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.