chemical tests
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卡片预览 (15 张)
universal indicator in neutral
green
universal indicator in strong acid
red
universal indicator in strong alkali
purple
test for presence of water
cobalt chloride paper blue -> pink
test for pure water
anhydrous copper sulfate test white -> blue
test for carbon dioxide
limewater colourless -> cloudy CO2 + Ca(OH)2 -> CaCO3 + H2O
test for oxygen
relights a glowing splint
test for double bond
bromide water (brown solution) decolourizes
phenolphthalein in acid
colourless
phenolphthalein in alkali
pink
test for hydrogen
squeaky pop test (when hydrogen is lit, it makes a squeaky pop noise)
test for lipids
ethanol emulsion test colourless -> milky white
test for protein
biuret test blue -> purple
test for sugar
benedict’s test (heat!) blue -> red
test for starch
iodine test orange -> black