Chemical Analysis Flashcards
What is a pure substance
A substance made from one single element or compound
How can you tell if a substance is pure
It’s melts at a specific fixed temperature and has a fixed boiling point
What’s the properties of impure substances 
They melt and boil over a range of temperatures
What is a formulation
A mixture that has been designed as a useful product
How’s a formulation made
The quantity of each component is carefully measured so that the product has the properties you need
What is paper chromatography used for
To separate mixtures 
What is the stationary phase in paper chromatography
The paper because it doesn’t move
What is the mobile phase in paper chromatography
The solvent
How can you tell if a substance is pure in paper chromatography
It will produce a single spot
Why is the starting line drawn in pencil
To prevent it from dissolving in the solvent
What can the Rf value be used for
To identify a substance
How do you calculate the Rf value
Distance moved by substance / Distance moved by solvent
How do you perform a flame test
Placed a small amount of chemical onto wire mounted in a handle
Place wire into blue flame
The colour of the flame will show which metal ion is present
What colour flame does lithium produce
Crimson flame 
What colour flame does sodium produce
Yellow flame
