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Mixtures, Solutions, and Solvents
Pure substances and impurities
Separation Methods (1)
Separation Methods (2)
More about chromatography
100
How many substances does a mixture contain?
More than one substance
100
What is a pure substance?
a substance which has no particles of any other substance mixed with it
100
Chalk and water. Which one is the filtrate?
Water
100
A way to obtain the solvent from a solution
Simple distillation
100
An example of a stationary phase
Paper glass plastic beads a coating on a glass plate (any one of these are correct)
200
Water is an example of a....?
Solvent
200
What's impurity?
An unwanted substance, mixed with the substance you want
200
What is centrifuge used for?
to separate small amounts of solid and liquid
200
A way to separate a mixture of liquids from each other..
Fractional distillation
200
an example of a mobile phase
liquid or gas
300
Sugar is a __________
Solute
300
Checking melting and boiling points can be used to...
to check purity
300
Process in which solids are obtained from their solutions by allowing them to form crystals
crystallisation
300
To find out how many colored substances are in black ink, what method can be used?
Paper chromatography
300
Chromatography can be used to identify a _____________.
substance
400
Which compound is more soluble than sugar?
Silver Nitrate
400
What method of separation is used to seperate a solvent from a solution
distil
400
Why can't water be used to separate salt and sugar?
Because it dissolves both
400
Paper chromatography can be used for colored and _______ substances
colorless
400
which amino acid has the highest rf value
leucine
500
A fact about the solvents, white spirit, propanone (acetone) and ethanol
They evaporate easily at room temperate. They are volatile.
500
What happens when a substance contains an impurity?
Its melting point falls and its boiling point rises
500
This dissolves water but not salt....
Ethanol
500
__________ shows the separate substances. This is called a __________.
filter paper, chromatogram
500
How do you work out a Rf value of a compound?
rf value = distance moved by amino acid/distance moved by solvent