5 Shape of molecules

 

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Oxford Textbook Pages : 60 - 63

CGP Revision Guide Pages : 28 - 29

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Show Specification Ref : 3.1.3.5

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Question 1 / 5

AQA Jan 2010 Paper 1 Q6 pmt areas outside the box will not be scanned for marking a molecule of clf reacts with a molecule of asf as shown in the following equation clf asf clf asf ion ion ion include any lone pairs of electrons use your understanding of electron pair repulsion to draw the shape of the asf molecule and the shape of the clf name the shape made by the atoms in the asf molecule and in the clf predict the bond angle in the clf marks extra space end of questions wmp jan chem
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Question 2 / 5

AQA Jan 2012 Paper 1 Q1 section a answer all questions in the spaces provided do not write outside the box a fluorine forms compounds with many other elements fluorine reacts with bromine to form liquid bromine trifluoride brf state the type of bond between br and f in brf and state how this bond is formed type of bond how bond is formed marks b two molecules of brf react to form ions as shown by the following equation brf brf brf b i draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks b ii draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks wmp jan chem do not write outside the box c ions are also formed when potassium fluoride dissolves in liquid brf to form brf kbrf explain in terms of bonding why kbrf has a high melting point marks extra space d fluorine reacts with hydrogen to form hydrogen fluoride hf d i state the strongest type of intermolecular force between hydrogen fluoride molecules mark d ii draw a diagram to show how two molecules of hydrogen fluoride are attracted to each other by the type of intermolecular force that you stated in part d i include all partial charges and all lone pairs of electrons in your diagram e the boiling points of fluorine and hydrogen fluoride are oc and oc respectively explain in terms of bonding why the boiling point of fluorine is very low marks marks extra space turn over wmp jan chem
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Question 3 / 5

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 4 / 5

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 5 / 5

AQA Jun 2015 Paper 1 Q1 section a answer all questions in the spaces provided do not write outside the box a this question is about the elements in period of the periodic table state the element in period that has the highest melting point explain your answer marks element explanation b state the element in period that has the highest first ionisation energy explain your answer marks element explanation c suggest the element in period that has the highest electronegativity value mark wmp jun chem do not write outside the box d chlorine is a period element chlorine forms the molecules clf and ccl d i use your understanding of electron pair repulsion to draw the shape of clf and the shape of ccl include any lone pairs of electrons that influence the shape marks shape of clf shape of ccl d ii name the shape of ccl mark d iii write an equation to show the formation of one mole of clf from its elements mark turn over for the next question turn over wmp jun chem
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