1 Reaction with oxygen and water

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Oxford Textbook Pages : 346 - 348

CGP Revision Guide Pages : 106

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Show Specification Ref : 3.2.4

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Question 1 / 5

January 2011 QP – Unit 5 AQA Chemistry A-level_question_3 do not write outside the box there is a link between the properties of the oxides of the period elements and their structure and bonding the table below shows the melting points of the oxides of some period elements tm k na o sio p o a in terms of crystal structure and bonding explain in each case why the melting points of sodium oxide and silicon dioxide are high na o sio marks b predict whether the melting point of lithium oxide is higher than the same as or lower than the melting point of sodium oxide and explain your prediction prediction explanation marks c phosphorus v oxide has a lower melting point than sodium oxide c i state the structure of and bonding in phosphorus v oxide marks wmp jan chem do not write outside the box c ii explain why the melting point of phosphorus v oxide is low mark d separate samples of phosphorus v oxide and sodium oxide were reacted with water in each case predict the ph of the solution formed and write an equation for the reaction ph with p o equation ph with na o equation marks e write an equation for the reaction between na o and p o state the general type of reaction illustrated by this example equation reaction type marks turn over for the next question turn over wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jan chem
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Question 2 / 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 3 / 5

June 2012 QP – Unit 5 AQA Chemistry A-level_question_1 section a answer all questions in the spaces provided do not write outside the box white phosphorus p is a hazardous form of the element it is stored under water a suggest why white phosphorus is stored under water mark b phosphorus v oxide is known as phosphorus pentoxide suggest why it is usually represented by p o rather than by p o mark c explain why phosphorus v oxide has a higher melting point than sulfur vi oxide marks d write an equation for the reaction of p o with water to form phosphoric v acid give the approximate ph of the final solution equation ph marks wmp jun chem do not write outside the box e a waste water tank was contaminated by p o the resulting phosphoric v acid solution was neutralised using an excess of magnesium oxide the mixture produced was then disposed of in a lake e i write an equation for the reaction between phosphoric v acid and magnesium oxide mark e ii explain why an excess of magnesium oxide can be used for this neutralisation mark e iii explain why the use of an excess of sodium hydroxide to neutralise the phosphoric v acid solution might lead to environmental problems in the lake mark turn over for the next question turn over wmp jun chem
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Question 4 / 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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Question 5 / 5

June 2014 QP – Unit 5 AQA Chemistry A-level_question_3 do not write outside the box a this question is about some period elements and their oxides describe what you would observe when in the absence of air magnesium is heated strongly with water vapour at temperatures above k write an equation for the reaction that occurs marks observations equation b explain why magnesium has a higher melting point than sodium marks extra space c state the structure of and bonding in silicon dioxide other than a high melting point give two physical properties of silicon dioxide that are characteristic of its structure and bonding marks structure bonding physical property physical property wmp jun chem d give the formula of the species in a sample of solid phosphorus v oxide state the structure of and describe fully the bonding in this oxide do not write outside the box marks formula structure bonding e sulfur iv oxide reacts with water to form a solution containing ions write an equation for this reaction mark f write an equation for the reaction between the acidic oxide phosphorus v oxide and the basic oxide magnesium oxide mark turn over for the next question turn over wmp jun chem
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