AQA Jun 2012 Paper 1 Q4

Answers available below

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

Show answer