chemical testing Flashcards
MASH
metal + acid > salt + hydrogen
OAWS
metal oxide + acid > waster + salt
HAWS
metal hydroxide + acid > water + salt
CAWSC
metal carbonate + acid > water + salt +carbon dioxide
what are the four metal reactions
metal
metal oxide
metal hydroxide
metal carbonate
test for ammonia gas
damp red litmus paper turns blue
test for carbon dioxide gas
bubble for lime water will turn cloudy
test for chlorine gas
damp blue litmus paper is bleached
test for hydrogen
glowing splint - squeaky pop
test for oxygen
lighted splint - ignites
flame test for lithium (Li+)
red
flame test for sodium (na+)
yellow
flame test for pottasium (K+)
lilac
flame test for calcium (Ca2+)
orange - red
why are all the metals in flame tests positive ions
oxygen is a negative ion - it reacts with oxygen to produce the coloured flame
flame test for copper (Cu2+)
blue - green
halide reaction for chloride
white precipitate
halide test for bromide
cream precipitate
halide test for iodide
yellow precipitate
chemical test to show a liquid contains water
add water to anhydrous white copper sulphate.
will turn blue
physical test for pure water
freeze or boil - if it is the pure then it will be the same as water (100 degrees or o degrees)
physical test for normal water
boils at or around 100 degrees
chemical test for pure water
set up a simple circuit with a light bulb.
if bulb does not light up then it is pure water.
if bulb does light up it is likely normal water as normal water can conduct some electricity
test for the presence of carbonate ions
add hydrochloric acid.
will produce carbon dioxide bubbles.
test for carbon dioxide with lime water.
