Chemical Analysis Flashcards
What’s a pure substance
Single element or compound have one melting or boiling point
What’s an impure substance
A mixture doesn’t have one boiling and melting point
What’s a formulation
A mixture designed for a specific purpose (components carefully controlled)
What are the two phases of chromatography
Mobile (liquid or gas carried) and stationary phase (solid or viscous liquid)
What happens if a substance is attracted to the mobile or stationary phase?
Mobile: moves far
Stationary: doesn’t move far
In paper chromatography what is the stationary and mobile phases?
Mobile phase: solvent
Stationary: paper
How to calculate Rf value
Tf = distance of substance/distance travelled by solvent
What’s the gas test for hydrogen
Squeaky pop (when put a lit splint into test tube)
What’s the gas test for chlorine
Turns damp litmus paper white
The gas test for oxygen
Delights flowing splint
Gas test for carbon dioxide
Turns limewater cloudy
Give two advantages for modern instrumental methods
More accurate and faster
Name a instrumental method using highly accurate equipment
Flame emission spectroscopy
What colour does copper go (flame test)
Green
What colour does calcium go (flame tests)
Brick red
