How do you decide what state a substance will be in at a given temperature?
Below the melting point, the substance is solid, between the melting point and the boiling point the substance is a liquid, above the boiling point the substance is a gas
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What is the difference between a pure substance and a mixture?
a pure substance cannot be changed and is the in all parts of the substance. A mixture is not chemically joined together and can be separated by a physical process
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What happens to its particles when a solid melts?
the particles gain enough energy to overcome the weak forces of attraction
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How can filteration be used to seperate mixtures
the residue stays behind and the filtrate goes through the filter paper
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What are the hazards and risks when separating mixtures by filtration and crystallisation
The risk of spitting, the Bunsen burner
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How can chromatography be used to separate mixtures
It carries the diferent particles in the mixture at different times so they all separate
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How do you calculate an Rf value
Rf = distance moved by the compound ÷ distance moved by the solvent
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What is distillation
seperating pure water from the dissolved solids
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How do simple distillation and fractional distillation differ
Fractional distillation differs from distillation only in that it separates a mixture into a number of different parts, called fractions
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Why must water used in chemical analysis be pure
it would show a incorrect result
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Other cards in this set
Card 2
Front
What is the difference between a pure substance and a mixture?
Back
a pure substance cannot be changed and is the in all parts of the substance. A mixture is not chemically joined together and can be separated by a physical process
Card 3
Front
What happens to its particles when a solid melts?
Back
Card 4
Front
How can filteration be used to seperate mixtures
Back
Card 5
Front
What are the hazards and risks when separating mixtures by filtration and crystallisation
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