8 Permanent dipole-dipole forces

 

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Oxford Textbook Pages : 54 - 55

CGP Revision Guide Pages : 30

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Show Specification Ref : 3.1.3.7

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Question 1 / 3

AQA Jun 2010 Paper 1 Q1 section a do not write outside the box answer all questions in the spaces provided fluorine forms many compounds that contain covalent bonds a i state the meaning of the term covalent bond mark a ii write an equation to show the formation of one molecule of cif from chlorine and fluorine molecules mark b draw the shape of a dichlorodifluoromethane molecule cci f and the shape of a chlorine trifluoride molecule cif include any lone pairs of electrons that influence the shape shape of cci f shape of cif c suggest the strongest type of intermolecular force between cci f molecules mark marks wmp jun chem do not write outside the box d bf is a covalent molecule that reacts with an f ion to form a bf ion d i name the type of bond formed when a molecule of bf reacts with an f ion explain how this bond is formed type of bond explanation marks extra space d ii state the bond angle in the bf ion mark e an ultrasound imaging agent has the formula c f it can be made by the reaction of butane and fluorine as shown in the following equation c h f c f hf calculate the percentage atom economy for the formation of c f in this reaction give your answer to three significant figures marks turn over wmp jun chem the following diagram shows the first ionisation energies of some period elements do not write outside the box first ionisation energy kj mol na mg al si cl a draw a cross on the diagram to show the first ionisation energy of aluminium mark b write an equation to show the process that occurs when the first ionisation energy of aluminium is measured marks c state which of the first second or third ionisations of aluminium would produce an ion with the electron configuration s s p s mark d explain why the value of the first ionisation energy of sulfur is less than the value of the first ionisation energy of phosphorus marks extra space wmp jun chem
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Question 2 / 3

AQA Jun 2011 Paper 1 Q3 do not write outside the box fluorine and iodine are elements in group of the periodic table a explain why iodine has a higher melting point than fluorine marks extra space b i draw the shape of the nhf molecule and the shape of the bf molecule include any lone pairs of electrons that influence the shape in each case name the shape shape of nhf shape of bf name of shape of nhf name of shape of bf marks b ii suggest a value for the f n f bond angle in nhf mark c state the strongest type of intermolecular force in a sample of nhf mark wmp jun chem do not write outside the box d a molecule of nhf reacts with a molecule of bf as shown in the following equation nhf bf f hnbf state the type of bond formed between the n atom and the b atom in f hnbf explain how this bond is formed name of type of bond how bond is formed marks turn over for the next question turn over wmp jun chem do not write outside the box there are several types of crystal structure and bonding shown by elements and compounds a i name the type of bonding in the element sodium mark a ii use your knowledge of structure and bonding to draw a diagram that shows how the particles are arranged in a crystal of sodium you should identify the particles and show a minimum of six particles in a two dimensional diagram b sodium reacts with chlorine to form sodium chloride b i name the type of bonding in sodium chloride mark b ii explain why the melting point of sodium chloride is high marks marks extra space wmp jun chem
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Question 3 / 3

AQA Jun 2016 Paper 1 Q2 do not write outside the box a van der waals forces exist between all molecules explain how these forces arise marks b table shows the boiling points of methanol ch oh and methanethiol ch sh compound methanol methanethiol table boiling point c b i explain in terms of their intermolecular forces why the boiling points of these compounds are different marks b ii suggest how a mixture of methanol and methanethiol could be separated mark wmp jun chem c suggest why methaneselenol ch seh has a higher boiling point than methanethiol ch sh do not write outside the box marks d sulfur forms many molecular compounds with the halogens d i draw the shape of an sf and of an sf molecule include any lone pairs that influence the shape state the bond angle s in sf and in sf name the shape of sf marks sf sf shape bond angle s name of shape turn over wmp jun chem do not write outside the box d ii scl reacts with naf to form sf and s cl and one other product write an equation for the reaction marks wmp jun chem
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