Pure Substances
A single substance or compound
↳2 main Elements and Compounds
groups
:
Elements
Pure substance that cannot be broken down
compounds
of elements bonded fixed chemical
Made
up 2 or more in a ratio
by a reaction
Mixtures
Impure substances :
2 or more different substances
physically blended
Uniform (
Homogeneous :
phase)
same
uniform ( different phases)
Heterogeneous :
Non -
Checking purity of substance
Melting point of pure substance is constant
Impure substances melt at
range
of temps
,Metals
Left side of periodic table ( Group 3-12 :
Transition Metals )
Physical properties :
Shiny
•
High density
•
High melting point
•
Chemically reactive metals
•
Burn in
oxygen
•
Release Oz when react w/ acid
Non -
Metals
Proper
.tiYoj density
•
will shatter if broken
conductor
Only carbon
graphite is
good
•
as
•
Some
gases
are
•
Oz reacts w/ non - metals to form acidic oxides .
Metalloids
Similar to metals and non - metals
proper
.tieng
•
Dense
•
Dont react w/ acid
•
Resistance decrease when temp increases
, Chapter 3 :
Theory of Matter
3 states of matter :
Solid
•
.
Liquid
.
Gas
Sublimation :
Solid Gas
→
Deposition : Gas Solid
Properties of Solids
1.
High density
2 .
Keep shape
3.
Expand when heated
Fixed
4.
melting point
Properties of Liquids
7.
Evaporate
2 .
Expand heatingon
3 .
Diffusable
4. Take shape of container
Properties of Gases
Low
7.
density
z .
Expand on
heating
3 .
Compressible
4 .
Take shape of container
What -
s inside solids and liquids ?
Solids -
particles vibrate in fixed position
Volume of solids is fixed
Liquids -
particles move around as
they vibrate
Fixed Volume
Particles are further apart
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