0620 Unit1 Questions

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Core 1

w  w  w  . X   t  r  e  m  

e  P  a   p  e  r  s  . c

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Alternative to Practical 1

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Alternative to Practical 2

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Alternative to Practical 3

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Extension 1

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Extension 2

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Chemical Analysis & Techniques page 1

Core 1

a(i) (Liebig) condenser 

(ii) 99

(iii) limonene floats on water / on top of the water 

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Chemical Analysis & Techniques page 2

 Alternat ive to Practical 1

a C  = buretteD = pipette

b five points from theseknown volume of / pipette oven cleaner into flask / beaker named acidin buretteuse of indicator note volume of acid to neutralise oven cleaner repeat with other oven cleaner 

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Chemical Analysis & Techniques page 3

 Alternat ive to Practical 2

a colour – redpH 1-3

c whiteprecipitate

d fizz / effervescence / bubbleslimewater gives a milky / white precipitate

f chlorine

g carbon dioxide

h zinc

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Chemical Analysis & Techniques page 4

 Alternat ive to Practical 3

a A – Bunsen burner  B – TripodC – Gauze

D – Crucible

b indication of burning, light / flame / glowwhite smoke / ash

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Chemical Analysis & Techniques page 5

Extension 1

i fuel or making esters or antiseptic or ethanoic acid or vinegar or thermometers

ii does not dissolve or does not contain dyes

iii two of theseto develop it or locating agentsamples are colourlessto make them visible

iv any two of theseonly one spotsame position or Rf valuecompare with glucose

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Chemical Analysis & Techniques page 6

Extension 2

a heat green crystalsadd water to yellow powder goes green

b weigh solutionevaporate to drynessweigh (solid)solution – solid is water or mass of water / mass of solution * 100

c bubbleslimewater goes cloudy

add sodium hydroxidewhite precipitate

add aqueous ammonia

no precipitate or faint one

or flame test with red / orange / brick red flame

d any four of theseindicator titrationfind volume of sodium hydroxide to neutraliseif volumes the same then HYif twice volume of alkali then H2Y