Elements, Mixtures and Compounds

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How many different types of atoms are in an element
1
1 of 15
what is special about compounds
they are 2 or more elements chemically bonded
2 of 15
what is the diference between compounds and mixtures
mixtures can be easily seperated but compounds are chemically bound
3 of 15
what sort of melting point does a pure substance have
A fixed melting point
4 of 15
what does filteration seperate
an insoluble solid from a liquid
5 of 15
describe how you peform crystlisation
pour solution into evap dish and gently heat, once crystals have started to form or water has evaporated then remove dish from heat. the salt should start to form crystals. filter the crystals out and let them dry
6 of 15
in what order do you use filteration and crystilisation to seperate rock salt
filteration then crystilisation
7 of 15
how does chromotography work
it seperates different dyes at different speeds
8 of 15
how do you find the Rf value
distance travelled by solute divided by distance travelled by solvent
9 of 15
what is simple distillation used for
seperating a liquid from a solution
10 of 15
what is a problem with distillation
it can only seperate liquids with very different boiling points
11 of 15
what does distillstion do to the vapour
It is cooled, condensed and collected
12 of 15
give one example of what you can seperate using distillation
seawater, ethanol from water
13 of 15
how do you collect multiple different fractions using fractional distillation
you increase the temperature
14 of 15
where is the coolest piece of the fractionating column
the top to allow it all to condense
15 of 15

Other cards in this set

Card 2

Front

what is special about compounds

Back

they are 2 or more elements chemically bonded

Card 3

Front

what is the diference between compounds and mixtures

Back

Preview of the front of card 3

Card 4

Front

what sort of melting point does a pure substance have

Back

Preview of the front of card 4

Card 5

Front

what does filteration seperate

Back

Preview of the front of card 5
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