Topic 9 Flashcards
(11 cards)
sulfate ion test
-add dilute hydrochloric acid
-add barium chloride solution
-sulfate=white precipitation
halide ion test
-add dilute nitric acid
-then silver nitrate solution
chlorine=white
bromine=cream
iodine=yellow
flame tests
-clean nicrome wire loop wigh hydrochloric acid
-dip loop into sample
-put it into blue part of flame
-record colour
lithium=red
sodium=yellow
potassium=lilac
calcium=orange/red
copper=bluey green
carbonate ion test
-add hydrochlorid acid
-collect gas
-bubble through limewater
carbonate=cloudy/milky
precipitation with sodium hydroxide
-few drops of sodium hydroxide into ur metal hydroxide
calcium=white
copper=blue
iron ||=green
iron |||=brown
ammonium
-add sodium hydroxide to solution with unkown substance
-heat it
ammonia gas given off=ammonium ions
momomer used to make polyethene
ethene
H H
| |
c=c
| |
H H
difference between addition and condensation polymerisation
addition-double bond breaks
-monomers link together
condensation-monomers have 2 functional groups
-water molecule is eliminated
bromine water test
-shake togther
-alkene=bromine water turns from orange to colourless because displacement reaction takes place and bromine added to double bond
-alkane=dont react because they dont have double bond
combustion of alchols pratical
-alchol in spirit burner
-meassure mass of burner and fuel using mass balance
-100cm cubed distilled water in copper calorimeter
-cover with insulating lid after placing themometer inside to make sure energy isnt lost
-take initial temp of water
-put burner under calorimeter and light wick
-stit water thruout w thermometer
-when temp risten by 20 blow oht spirit burner
-reweigh burner and fuel
-repeat using other alchols
nanoparticles
-a really thin particle that modifies properties of materialss
-high SA:V
-asorbed into body so can deliver drugs to where needed
-in suncreen bc better protection
-conduct electricity in tiny circuits
-silver nanoparticles used in surgical mask and wound dressings
