Chapter 2 : Matters and Materials
Gasifying Matter
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
Gasifying Matter
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
