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18 Cards in this Set
- Front
- Back
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What is a pure substance? |
It is a substance that has no other substance mixed with it. |
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What is an impurity? |
An unwanted substance that is mixed with the substance you want. |
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Does purity matter? |
Not necessarily, but sometimes... such as when we make drugs |
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How can you tell if a substance is pure or not? |
By checking the melting and boiling points. |
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When there is an impurity in a substance- how does that affect the melting point? or boiling point? |
It changes it- the number isn't exact...for example the melting point does down and the boiling point goes higher. Or it melts or boils over a larger range of temperature instead of just at one degree. |
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What is the melting point of water? |
0 degrees |
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What is the boiling point of water? |
100 degrees |
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What separation method do you use to separate a solid from a liquid? |
Filtration |
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What do you separate when you do FILTRATION? |
A solid from a liquid |
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What separation method do you use to separate a solute from its solution? |
Crystallization or Evaporation |
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What does crystallization method of separation separate? |
A solute from a solution |
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What does Evaporation separation methods separate? |
A solute from a solution |
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What does Simple Distillation separation method separate? |
A solvent (the liquid) from a solution |
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What separation technique is used to separate a solvent from a solution? |
Simple Distillation |
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What does Fractional Distillation separate? |
Liquids from each other |
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What does Paper Chromatography separate? |
Difference substances from a solution |
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How do you separate different substances from a solution (liquid)? |
Using Paper Chromatography |
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How do you separate different liquids from each other? |
Using Fractional distillation |
