Post on 14-Dec-2015
Matter part 2
Properties & Change
Defining Matter
Properties of Matter
Extensive vs. Intensive
Changes in Matter
A. What is Matter?
Anything that has…
mass (an amount)
volume (takes up space)
One of these things just doesn’t belong here… which of the following is not matter?
water energyice air
B. Properties of Matter
Physical PropertyPhysical Property
can be observed without changing can be observed without changing the identity of the substancethe identity of the substance
Chemical PropertyChemical Property
describes the ability of a substance describes the ability of a substance to undergo changes in identityto undergo changes in identity
C. Extensive vs. Intensive
ExtensiveExtensive Physical Property
depends on the amount of matter present
IntensiveIntensive Physical Property
depends on the identity of substance, not the amount
D. Physical Change
Physical Change
changes thechanges the formform of a substance without changing its identity
properties stay the same
E. Chemical Changes
Chemical Change
changes the identitychanges the identity of a substance
products have different properties
a.k.a. chemical reaction
E. Chemical Changes
Signs of a Chemical Change
change in color or odor
formation of a gas
E. Chemical Changes
formation of a precipitate (new solid)
evolution of heat or light
Physical or Chemical Change?
rusting iron
dissolving in
water
burning a log
boiling water
grinding spices
chemical
physical
chemical
physical
physical
F. States of Matter
Solids particles vibrate in place
but can’t move around fixed shape fixed volume
F. States of Matter
Liquids particles move
around but are still close together
variable shape fixed volume
F. States of Matter
Gases particles separate and
move throughout the container
variable shape variable volume
F. States of MatterF. States of Matter PlasmaPlasma
particles collide with particles collide with enough energy to break enough energy to break into charged particles (+/-)into charged particles (+/-)
gas-like, variablegas-like, variableshape & volumeshape & volume
stars, fluorescentstars, fluorescentlight bulbs, plasma TV’slight bulbs, plasma TV’s
F. States of Matter
A phase changephase change is when matter changes from one state to another. i.e. melting, freezing, evaporation
Is a phase change chemical or physical? Boiling => bubbles produced HowHow were bubbles produced?