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Ch. 7 Test
ehhhhhhw.
24
Science
9th Grade
02/05/2009

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Term
Name 3 differences between mixtures and compounds.
Definition
mixtures are physically combined & compounds are chemically combined.

new substances are formed in compounds and not in mixtures.

compounds are separated by chemical means; mixtures are separated by physical means.
Term
what is a heterogeneous mixture?
Definition
a non-uniform blend of 2 or more substances.
Term
what is a homogeneous mixture?
Definition
a uniform blend of 2 or more substances.
Term
What are the 2 types of heterogenous mixtures?
Definition
suspensions and colloids.
Term
Explain the particles in a suspension.
Definition
mixture in which particles of a material are are more or less evenly dispersed throughout a liquid.
Term
What is a colloid?
Definition
mixture in which tiny particles that are intermediate in size between a solution and a suspension
Term
What is the Tyndall Effect?
Definition
particles of a colloid are too small to be filtered but are large enough to scatter light
Term
substance that dissolves the solvent
Definition
solute
Term
substance in which the solute dissolves
Definition
solute
Term
name 3 examples of solutions
Definition
air.
carbon dioxide.
&alloys
Term
how can you separate solutions?
Definition
evaporation and distillation
Term
what are some examples of colloids?
Definition
latex paint, smog
Term
How much of the earth is water? your body?
Definition
2/3 & 3/4
Term
explain like dissolves like.
Definition
a solvent will dissolve substances that are chemically and molecularly similar to it.
Term
how can you increase the dissolving process?
Definition
shaking or stirring, raising temperature
Term
maximum amount of solute that will dissolve in any given solvent at a given temperature and pressure
Definition
solubility
Term
amount of solute dissolved in a given volume of a solution
Definition
concentration
Term
solution that has a large amount of solute
Definition
concentrated
Term
solution that has small amount of solute
Definition
dilute
Term
holds more solute than it normally can by increasing temperature then cooling down
Definition
supersaturated
Term
can dissolve no more solute
Definition
saturated
Term
contains less than the max amount of solute that will dissolve in solvent under the same conditions
Definition
unsaturated
Term
what is the order of mixtures from biggest to smallest?
Definition
suspension, colloid, solution
Term
what is the formula for molarity?
Definition
molarity=moles/liters
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