AQA Jun 2014 Paper 5 Q3 (with explained solutions) |

Skip to content

AQA Jun 2014 Paper 5 Q3

Answers available below

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

Show answer

mark scheme a level chemistry chem june marking guidance mark comments white powder solid ash smoke bright white light flame mg h o mgo h mg magnesium ion has higher charge than na attracts delocalised free sea of electrons more strongly metal metal bonding stronger metallic bonding stronger ignore ppt fumes allow glows white glows bright ignore state symbols ignore reference to effervescence or gas produced allow mg ions smaller greater charge density than na ions allow mg atoms smaller than na atoms allow magnesium has more delocalised electrons must be a comparison ignore reference to nuclear charge wrong type of bonding vdw imf mention of molecules ce of question a b mark scheme a level chemistry chem june structure macromolecular giant molecule giant covalent bonding covalent giant covalent physical properties any two from hard brittle not malleable insoluble non conductor formula p o structure molecular bonding covalent shared electron pair van der waals dipole dipole forces between molecules mark independently ignore correct chemical properties ignore strong high boiling point rigid mention of ionic or metallic can score m only if macromolecular can score m m only allow vdw imf and dipole dipole imf but do not allow imf alone of c d e so h o h hso f p o mgo mg po or p o mgo mg po or p o mgo mg po etc mark scheme a level chemistry chem june products must be ions allow so h o h so allow two equations showing intermediate formation of h so ignore state symbols allow multiples that ends up as ions ignore state symbols allow multiples of

Question 1 2 3 4 5 6 7 8

Topics to revise

AQA > Inorganic chemistry > Period 3 >

1 Reaction with oxygen and water

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Physical chemistry > Bonding AS >

4 Bonding and structure

AQA > Physical chemistry > Bonding AS >

3 Metallic bonding

AQA > Inorganic chemistry > Period 3 >

2 Properties of period 3 oxides

Similar questions

AQA Jun 2016 Paper 2 Q1

AQA Jun 2015 Paper 5 Q4

AQA Jan 2011 Paper 1 Q5

AQA Jun 2011 Paper 5 Q4

AQA Jan 2011 Paper 5 Q3

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.