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? waterenergy iceair

B. Properties of Matter  Physical Property  can be observed without changing the identity of the substance  Chemical Property  describes the ability of a substance to undergo changes in identity

C. Extensive vs. Intensive  Extensive  Extensive Physical Property  depends on the amount of matter present  Intensive  Intensive Physical Property  depends on the identity of substance, not the amount

C. Extensive vs. Intensive  melting point  volume  mass  density  conductivity intensive extensive intensive

Physical vs. Chemical  Examples:  melting/boiling point  flammable  magnetic  density - mass of a specific volume physical chemical physical

Physical vs. Chemical  Examples:  luster - shiny or dull  toxic  malleable - can be pounded into thin sheets  ductile - can be drawn into thin wires physical chemical physical

Physical vs. Chemical  Examples:  conductivity  solubility - ability to dissolve in water  tarnishes in air  state - solid, liquid, gas physical chemical physical

D. Physical Change  Physical Change  changes the form  changes the form of a substance without changing its identity  properties stay the same

E. Chemical Changes  Chemical Change  changes the identity  changes 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

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 Matter  Plasma  particles collide with enough energy to break into charged particles (+/-)  gas-like, variable shape & volume  stars, fluorescent light bulbs, plasma TV’s

F. States of Matter phase change  A phase 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  How  How were bubbles produced?