0620 unit2 questions(2)
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(a)
(b)
Core 1
Periodic Table 2 Page 1
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Core 2
Periodic Table 2 Page 2
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Core 3
Periodic Table 2 Page 3
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Core 3
Periodic Table 2 Page 4
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(a)
Periodic Table 2 Page 5
Core 4
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Extension 1
Periodic Table 2 Page 6
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Extension 2
Fig. 1
Periodic Table 2 Page 7
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Extension 2
Periodic Table 2 Page 8
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Periodic Table 2 page 1
Core 1
a the molecules regular and of approximately the same sizethe molecules very close to / touching each other
b(i) gas has no (fixed) shape / has takes up shape of container whereas solid has fixedshape
(ii) test damp red litmus paper / damp full range indicator paper / damp universalindicatorpaper / damp pH paper / full range indicator solution
result turns blue
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Periodic Table 2 page 2
Core 2
a close together / randomly arrangedsliding over each other / moving slowly
b(i) yellow – green / greento brown
(ii) potassium chloride + iodine
c(i) colour yellow / yellow - greenstate gas
(ii) below –45oC
(iii) F2
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Periodic Table 2 page 3
Core 3
a 78
b any two of oxygen / carbon dioxide / argon / krypton / xenon
c(i) reversible (reaction) / equilibrium
(ii) gas
d(i) increase growth / increase yield / increase mass / grow faster
(ii) potassium
(iii) ammonium
e test add aluminium / Devarda’s alloy / zinc and sodium hydroxideresult ammonia given off / damp universal indicator paper or red litmus goes blue
f(i) oxygen removed / oxidation number of nitrogen decreases / nitrogen gains electrons
(ii) catalyst / description of catalyst
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Periodic Table 2 page 4
Extension 1
i move to right / more methanol / greater yield favours
ii molecules closercollide more frequently
iii increased concentration of methanoldecrease in temperature favours exothermic reaction
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Periodic Table 2 page 5
Extension 2
a(i) hydrogensodium sulphonate + carbon dioxide
(ii) Mg(RSO3)2
(iii) sulphur trioxidedissolved in (conc) sulphuric acid
(iv) add water
b any three points but it must be a precipitation methodmix lead nitrate and sulphuric acid or any soluble sulphatefilterwash and dryevaporate
c any two fromacidic oxidecovalent chloride or covalent bondsaccepts electronsoxidising agention Se2-
valency 2forms oxide SeO2 and / or SeO3forms selenides
d(i) photosynthesis
(ii) alcohol or ethanolfermentation
ORvegetable oildistil or crush seeds
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Periodic Table 2 page 6
Extension 3
a liquefaction of airfractional distillation
b cracking or decomposeheat or catalyst or forms alkene and hydrogen or simpler alkane and hydrogen
ORmix with water / steamuse of catalyst
c(i) it decreases
(i) right
(ii) pressure favours the side with fewer moles
increased pressure favours side with smaller volume
reduces pressure by reducing volume or number of molecules
increases rate of forward reaction more than back reaction
(iii) increase collision rate / molecules closer / higher concentration
d(i) fertiliser
(ii) (dilute) sulphuric acidany three from theseadd indicatorburette or titrationrepeat without indicator / remove with carbonevaporate solution / heat to form crystals