Catalyst – September, 7(1+1) 2009 Monday Mystery Element! 1. It’s atomic number is There are several allotropes: graphite and diamond 3. All forms of this element are highly stable.

Today’s Agenda  Catalyst  Particles/KMT Demo  Physical and Chemical Change Notes  It’s Demo Time!  Work Time  Exit Question

Front DoorProjector 2nd Period Group 3 Katty, Whitnie, Antonio, Joseph Group 2 Isaiah, Isaac, Robin, Reshad Group 1 Neron, Juan, Denney, Chelsea J. Group 6 Jared, Brittanee, T’Keyah, Group 4 Keith, Jessica, Chevalius, Sidne Group 9 Timothy, Elesha, Juan Group 8 Tre, Darren, Arethia, Byron Group 7 Kerrie, Jenny, Corian, Brittany Group 5 Dorian, Chelsea C., Chris

Today’s Objectives  SWBAT describe matter using physical and chemical properties.  SWBAT describe particles during physical and chemical changes.

Particles/KMT Recap  Remember! A particle is a very small piece of matter that holds the identity of the matter  Remember! The Kinetic Molecular Theory (KMT) says that particle movement is directly proportional to temperature

It’s Demo Time!  Materials:  3 beakers  Cold water  Warm water  Hot water  Hot plate  Food coloring

Physical Properties Key Point #1: A physical property of matter can be determined and observed without changing the nature of the substance.  Color  Shape  Texture  Odor  Melting/Freezing Points  Mass  Volume  Density  Solubility  Size

Physical Properties – I Spy!  In your notes, choose an object in the room and describe it using physical properties.

Chemical Properties Key Point #2: A chemical property of matter describes its potential to undergo some chemical change or reaction by virtue of its composition  It is difficult to define a chemical property without using the word "change"

It’s Demo Time!  Materials:  2 large beakers  Sugar  Alka Seltzer tablet  Spoon

Physical Change Key Point #3: A physical change is a type of change that alters the physical properties of a substance but does not change the composition  Could potentially be reversed! Composition is what a substance is made of

What happens to particles during a physical change? No new substances are formed; particles just move around Cut

What happens to particles during a physical change? No new substances are formed; particles just move around Dissolve

Evidence of Physical Change Bending, breaking, smashing, freezing, melting, evaporating, crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving...

Chemical Change  Key Point #4: A chemical change is a change that forms one or more new substances  Also known as a chemical reaction  Cannot be reversed!

What happens to particles during a chemical change? New substances are formed; particles change or rearrange Chemical Reaction New Substance

What happens to particles during a chemical change? New substances are formed; particles change or rearrange Chemical Reaction Particles Rearrange

Evidence of Chemical Change Fizzing, burning or combustion, corrosion, production of odor, heat, cold, light, rust, solids, smoke, decomposition, oxidation, rotting, digestion…

More Demos! Magnesium Ribbon Marshmallows Paper and Fire

Exit Questions 1. Pick one thing (different than before) in the room and describe it using physical properties. 2. In your own words, describe the difference between physical and chemical change.