Chemical Analysis Flashcards
What is a pure substance
A pure substance is a single element or compound which isn’t mixed with any other substances
Define a formulation
A formulation is a mixture that has been designed as a useful product
How are formulations made
There made by mixing the components in carefully measured quantities to ensure that the product has the required properties
What is chromatography used for
It’s used to separate mixtures and can give in for to help identify substances
What two phases do chromatography include
Stationary phase and mobile phase
What does separation depend on
The distribution of substances between the phases
What can the ratio of the distance moved by a compound to the distance moved by the solvent be expressed by
The Rf value
What the equation for teh Rf value
Rf = distance moved by substance
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Distance moved by solvent
What does the test for hydrogen include
A burning splint which is held at the open end of a test tube of the gas
How does hydrogen burn in the test for hydrogen
It burns rapidly with a pop sound
What does the test for oxygen include
A glowing splint inserted into a test tube of the gas
How does oxygen react in the test for oxygen
The splint relights in oxygen
What does the test for co2 include
Uses a (aq) solution of calcium hydroxide and the co2 is shaken with or bubbled through limewater
What is calcium hydroxide
Lime water
How does co2 react on the test for it
the limewater turns milky
