identifying gases and ions (51-53) (paper 1) Flashcards
(27 cards)
what is the chemical test and result for hydrogen gas
- lit split
= squeaky pop
what is the chemical test and result for oxygen
- glowing splint
= relights
what is the chemical test and result for carbon dioxide
- add HCl
- bubble through limewater
= goes cloudy white
what is the chemical test and result for chlorine gas
- damp blue litmus paper
= may turn red then bleached white
what is the chemical test and result for ammonia gas
- add NaOH and warm gently
- damp red litmus paper
= turns blue
what is the chemical test and result for water
- white anhydrous copper sulfate
= blue
what is the physical test and result for water
- heat until boiling
= will boil at 100
how is a flame test carried out
- dip a nichrome wire into an acid (must be unreactive, colourless & high melting point)
- dip into the ionic solid
- put it in roaring bunsen flame
why do we put the nichrome wire in a roaring bunsen flame
so the colour of the flame will not interfere
what is the colour of the flame for lithium
red
what is the colour of the flame for sodium
yellow
what is the colour of the flame for potassium
lilac
what is the colour of the flame for calcium
red-orange
what is the colour of the flame for copper
blue-green
when do you do a flmae test
for a metal ion
what is the chemical test and result for sulphat
- add HCl
- add BaCl2
= white precipitate
what do you do when testing for a metal ion in a solution
add NaOH
what do you do when identifying copper
add NaOH
what do you do when identifying iron
add NaOH
what is the colour of the precipitate fromed for copper
blue precipitate (Cu(OH)2)
what is the colour of the precipitate formed for iron (II)
green precipitate (Fe(OH)2)
what is the colour of the precipitate formed from iron (III)
brown precipitate (Fe(OH)3)
how do you test for non-metall ions (chlorine, bromine, iodine)
- add HNO3 (aq)
- add AgNO3 (aq)
what is the result for identifying chloride
white precipitate (AgCl)
