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Chemistry ch 3
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heterogeneous
contain more than one visible phase and are not uniform throughout
homogeneous
also contain more than one kind of material and can be separated easily
mixtures (solutions)
materials are so evenly distributed that the appear to be one phase
pure substances
always have the same somposition
2 types of pure substances
elements
compounds
elements
contain only one kind of atom
compounds
contain more than one kind of atom
phase
part of a material that has a uniform set of properties
interface
area where two phases meet
physical properties
can be observed or measured
length
mass
shape
color
texture
MP
BP
ductility
density
malleability
solubility
volume
physical change
the identity of the substance is not changed after the conditions change
distillation
difference in boiling point
chemical property
explains how it reacts with another substance
Chemical change
New substance is formed with new properties after conditions change
color change
gas given off
change in temp
precipitate forms
Endothermic
energy absorbed, and the have a higher energy (cold)
exothermic
energy released, and the products have less energy (hot)
activitaion energy
energy required to start the reaction
What do you need to raise the temperature of water 1 degree?
4.184 j
1 calorie =
4.184 joules
1 kilocalorie (C) =
1,000 calories (c)
specific heat
the amount of heat needed to raise the temperature of one gram of a substance
heat gained formula
q=m x T x Cp
When the system loses heat, use
Ti-Tf
When a substance gains heat, use
Tf-Ti
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Author
AnnaIsCool
ID
58638
Card Set
Chemistry ch 3
Description
matter
Updated
2011-01-09T17:21:14Z
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