C8 Summary Flash Cards

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what is a pure substance?
A single element or compound that is not mixed with any other substances
1 of 9
what is a formulation ?
a mixture designed as a useful product
2 of 9
what happens if an impurity is present?
- Lowers the melting point
-Raises the boiling point
-The greater the amount of impurity, the bigger the difference from the true melting and boiling point
3 of 9
Test for Common Gases
hydrogen- squeaky pop
oxygen- relights a glowing spill
carbon dioxide- lime water milky
chlorine- bleaches damp litmus paper
4 of 9
Flame Test
lithium- red
sodium- yellow
potassium -lilac
calcium- orange/red
copper- green
5 of 9
Teat for Cations
(precipitates)
calcium, aluminium,magnesium- white
copper- blue
iron(II)- green
iron(III)- brown
6 of 9
Test for Anions
chloride- white
bromide- cream
iodide- yellow
7 of 9
how do you calculate the Rf value ?
distance from base line to the spot
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distance from base line to solvent front
8 of 9
what are the 2 phases in chromatography?
Mobile phase—this is where the molecules can move. This is always a liquid or gas
Stationary phase—this is where the molecules can’t move. This is usually a solid or thick
liquid
9 of 9

Other cards in this set

Card 2

Front

a mixture designed as a useful product

Back

what is a formulation ?

Card 3

Front

- Lowers the melting point
-Raises the boiling point
-The greater the amount of impurity, the bigger the difference from the true melting and boiling point

Back

Preview of the back of card 3

Card 4

Front

hydrogen- squeaky pop
oxygen- relights a glowing spill
carbon dioxide- lime water milky
chlorine- bleaches damp litmus paper

Back

Preview of the back of card 4

Card 5

Front

lithium- red
sodium- yellow
potassium -lilac
calcium- orange/red
copper- green

Back

Preview of the back of card 5
View more cards

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