AQA Jun 2011 Paper 1 Q2

Answers available below

do not write outside the box norgessaltpeter was the first nitrogen fertiliser to be manufactured in norway it has the formula ca no a norgessaltpeter can be made by the reaction of calcium carbonate with dilute nitric acid as shown by the following equation caco s hno aq ca no aq co g h o i in an experiment an excess of powdered calcium carbonate was added to cm of mol dm nitric acid a i calculate the amount in moles of hno in cm of mol dm nitric acid give your answer to significant figures mark a ii calculate the amount in moles of caco that reacted with the nitric acid give your answer to significant figures mark a iii calculate the minimum mass of powdered caco that should be added to react with all of the nitric acid give your answer to significant figures marks a iv state the type of reaction that occurs when calcium carbonate reacts with nitric acid mark wmp jun chem do not write outside the box b norgessaltpeter decomposes on heating as shown by the following equation ca no s cao s no g o g a sample of norgessaltpeter was decomposed completely the gases produced occupied a volume of m at a pressure of kpa and a temperature of c the gas constant r j k mol b i calculate the total amount in moles of gases produced marks b ii hence calculate the amount in moles of oxygen produced mark c hydrated calcium nitrate can be represented by the formula ca no xh o where x is an integer a g sample of ca no xh o contains g of water of crystallisation use this information to calculate a value for x show your working marks turn over wmp jun chem 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

Show answer