chemical analysis and formulations Flashcards
what is chemical analysis
the proceeds of establishing what chemicals are present in a substance
in chemistry what is a pure substance
single element or compound
how can pure substances be distinguished
melting/boiling points
what is formulation
a complex mixture designed as a useful products
what are examples of formulations
fuels, cleaning agents, paint, medicines
what is chromatography
a process to separate the parts of a mixture
in paper chromatography what is the stationary phase and what is the mobile phase
paper is stationary, solvent is mobile
how do you spot a pure substance in chromatography
one spot
how do you calculate the rf value
distance spot moves/ distance of solvent
what does a substances rf value depend on
how soluble it is in the solvent
in chromatography why must substances be placed on a pencil line
pencil will not dissolve in solvent
what is the test for hydrogen
makes a squeaky pop when a splint is placed in it
what is the test for oxygen
relights a glowing spling
what is the test for carbon dioxide
bubble through limewater turns cloudy
what is the test for chlorine
bleaches damp litmus paper white
