6 Shapes of Molecules MS.doc - 6 OCR Chemistry A Question...

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6Shapes of molecules andintermolecular forcesExam-style questionsOCR Chemistry AQuestionnumberAnswerMarksGuidance1 a iBond angle109.5ºMust have 1 wedge and 1 dotted line / invertedwedgeB1B1Allow 109ºNone of the bonds should bedrawn at 180º across the centralcarbon atom.1 a iiThe (covalent) bond is between 2 atoms with differentelectronegativitiesso the more electronegative chlorine atom will attractthe bonding electrons more, leading to a partialnegative charge (δ).B1B11 a iiiNo overall dipole as the individual dipoles on thebonds cancel each other out as they all act inopposing directions.A1Although the bonds aren’t 180ºthe molecule isn’t slightly positiveat the top or bottom, etc. all of thedipoles cancel out.1 a ivIodine will be soluble as iodine is non-polar and so isthe solvent.Sodium chloride is likely to be insoluble as it isunlikely that the attraction between the ions and thenon-polar solvent molecules will be strong enough to

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Term
Fall
Professor
NoProfessor
Tags
Atom, Ion

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