AP Chemistry
Summer Review
Winston Churchill High School
2016-2017
Common Tests for gases
GAS
TEST
Hydrogen gas
Squeaky pop with lighted splint
Oxygen gas
Re-lights glowing splint
Turns limewater (Calcium Hydroxide
Carbon Dioxide gas
solution) milky
Pungent odor, turns red litmus paper
Ammonia gas
blue,gives dense white fumes in
contact with conc.HCl fumes
Common tests for cations and anions
ION
TEST
Carbonate and Hydrogen carbonate
Release CO
gas with acids
2
Sulfate
White ppt of BaSO
with barium ions
4
Chloride
White of AgCl with silver ions
Bromide
Cream ppt of AgBr with silver ions
Iodide
Yellow ppt of AgI with silver ions
Ammonium
NH
released with hydroxide ions
3
HALOGENS:
Fluorine gas – pale yellow/green,
Chlorine gas – green,
Bromine liquid –orange/brown,
Iodine solid – dark purple
NO2 gas – orange/brown
Color Changes in REDOX reactions
1) MnO4-(aq) → Mn2+(aq)
→(Pale
(Dark
Purple)
Pink)
2) Cr2O72-(aq) →Cr3+(aq)
(Orange) →
(Green)