1 Ionic and covalent bonding

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Oxford Textbook Pages : 44 - 49

CGP Revision Guide Pages : 24, 26

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Show Specification Ref : 3.1.3.1, 3.1.3.2

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Question 1 / 5

June 2012 QP – Unit 1 AQA Chemistry A-level_question_3 do not write outside the box the following equation shows the reaction of a phosphine molecule ph with an h ion ph h ph a draw the shape of the ph molecule include any lone pairs of electrons that influence the shape mark b state the type of bond that is formed between the ph molecule and the h ion explain how this bond is formed name of bond how bond is formed marks c predict the bond angle in the ph ion mark d although phosphine molecules contain hydrogen atoms there is no hydrogen bonding between phosphine molecules suggest an explanation for this mark turn over wmp jun chem do not write outside the box a graphene is a new material made from carbon atoms it is the thinnest and strongest material known graphene has a very high melting point and is an excellent conductor of electricity part of the structure of graphene is illustrated in the diagram a i deduce the type of crystal structure shown by graphene mark a ii suggest why graphene is an excellent conductor of electricity marks a iii explain in terms of its structure and bonding why graphene has a high melting point marks wmp jun chem
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Question 2 / 5

June 2012 QP – Unit 1 AQA Chemistry A-level_question_4 do not write outside the box a graphene is a new material made from carbon atoms it is the thinnest and strongest material known graphene has a very high melting point and is an excellent conductor of electricity part of the structure of graphene is illustrated in the diagram a i deduce the type of crystal structure shown by graphene mark a ii suggest why graphene is an excellent conductor of electricity marks a iii explain in terms of its structure and bonding why graphene has a high melting point marks wmp jun chem do not write outside the box b titanium is also a strong material that has a high melting point it has a structure similar to that of magnesium b i state the type of crystal structure shown by titanium mark b ii explain in terms of its structure and bonding why titanium has a high melting point marks c titanium can be hammered into objects with different shapes that have similar strengths c i suggest why titanium can be hammered into different shapes mark c ii suggest why these objects with different shapes have similar strengths mark d magnesium oxide mgo has a melting point of k predict the type of crystal structure in magnesium oxide and suggest why its melting point is high type of crystal structure explanation marks turn over wmp jun chem section b answer all questions in the spaces provided do not write outside the box a boron trichloride bcl can be prepared as shown by the following equation b o s c s cl g bcl g co g a sample of boron oxide b o was reacted completely with carbon and chlorine the two gases produced occupied a total volume of cm at a pressure of kpa and a temperature of k calculate the mass of boron oxide that reacted give your answer to significant figures the gas constant r j k mol marks extra space wmp jun chem
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Question 3 / 5

June 2013 QP – Unit 1 AQA Chemistry A-level_question_5 do not write outside the box aluminium and thallium are elements in group of the periodic table both elements form compounds and ions containing chlorine and bromine a write an equation for the formation of aluminium chloride from its elements mark b an aluminium chloride molecule reacts with a chloride ion to form the alcl ion name the type of bond formed in this reaction explain how this type of bond is formed in the alcl ion type of bond explanation marks c aluminium chloride has a relative molecular mass of in the gas phase deduce the formula of the aluminium compound that has a relative molecular mass of mark d deduce the name or formula of a compound that has the same number of atoms the same number of electrons and the same shape as the alcl ion mark e draw and name the shape of the tlbr ion shape of the tlbr ion name of shape marks wmp jun chem f i draw the shape of the tlcl ion do not write outside the box mark f ii explain why the tlcl ion has the shape that you have drawn in part f i mark g which one of the first second or third ionisations of thallium produces an ion with the electron configuration xe d s tick one box first second third mark turn over wmp jun chem do not write outside the box the elements in period show periodic trends a identify the period element from carbon to fluorine that has the largest atomic radius explain your answer element explanation marks b state the general trend in first ionisation energies from carbon to neon deduce the element that deviates from this trend and explain why this element deviates from the trend trend element that deviates explanation marks c write an equation including state symbols for the reaction that occurs when the first ionisation energy of carbon is measured mark wmp jun chem
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Question 4 / 5

June 2011 QP – Unit 5 AQA Chemistry A-level_question_4 do not write outside the box this question is about the chemistry of the period elements and the trends in their properties a i describe what you would observe when magnesium burns in oxygen write an equation for the reaction that occurs state the type of bonding in the oxide formed observations equation type of bonding marks a ii describe what you would observe when sulfur burns in oxygen write an equation for the reaction that occurs state the type of bonding in the oxide formed observations equation type of bonding marks b state the type of bonding in sodium oxide explain why sodium oxide reacts to form an alkaline solution when added to water type of bonding explanation marks wmp jun chem do not write outside the box c outline an experiment that could be used to show that aluminium oxide contains ions marks extra space d suggest one reason why a thin layer of aluminium oxide protects aluminium from corrosion in moist air mark e write an ionic equation in each case to show how aluminium oxide reacts with the following e i hydrochloric acid mark e ii aqueous sodium hydroxide mark turn over for the next question turn over wmp jun chem
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Question 5 / 5

June 2013 QP – Unit 5 AQA Chemistry A-level_question_4 do not write outside the box a magnesium oxide silicon dioxide and phosphorus v oxide are white solids but each oxide has a different type of structure and bonding state the type of bonding in magnesium oxide outline a simple experiment to demonstrate that magnesium oxide has this type of bonding type of bonding experiment marks b by reference to the structure of and the bonding in silicon dioxide suggest why it is insoluble in water marks wmp jun chem do not write outside the box c state how the melting point of phosphorus v oxide compares with that of silicon dioxide explain your answer in terms of the structure of and the bonding in phosphorus v oxide melting point in comparison to silicon dioxide explanation marks d magnesium oxide is classified as a basic oxide write an equation for a reaction that shows magnesium oxide acting as a base with another reagent marks e phosphorus v oxide is classified as an acidic oxide write an equation for its reaction with sodium hydroxide mark turn over wmp jun chem
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