What Matters? September 28, 2009

At the beginning we got our Chapter 1 Unit Tests back. Hopefully you guys did good! :)
We went over the questions most people had troubles with; one from the signifigant digits, and another from the conversions. Lesson plan followed with the next unit...

What is matter?
-Anything that has mass and occupies space
-Matter can exist in many different states, the most common are

• solid, liquid, gas
• plasma, aqueous, amorphous

(*note: most common is plasma, coming from lightning bolts)
-Solids: Holds one shape and has a definite volume
-Liquid: Can change shape, but has definite volume
-Gas: Can change shape and volume
-Aqueous: Something dissolved in water

PHYSICAL CHANGES
-Involves changing shape or state of matter

• crushing, tearing, ect.

-No new substances are formed

• boiling water, cutting wood, smashing cars

(*note: changes from a gas to a solid, and a solid to a gas it sublimation)

PHASE CHANGES
-Changing from a solid to a gas can often be confused as a chemical change

• chemicals remain the same

-During the melting process, chemicals usually follow this path:
(***REFER TO GRAPH FROM IN CLASS NOTES)

CHEMICAL CHANGE
-New substances are formed
-Properties of matter change

• conductivity, acidity, colour, ect
• e.g iron rusting, burning wood, digesting food

CONVERSION OF MATTER
-In physical and chemical changes, matter is neither created nor destroyed..EVER period.
-this is called the conversion matter

2H2 -------------------> 2H20


4 Hydrogen atoms 4 hydrogen atoms
+ 2 oxygen atoms + 2 oxygen atoms

(Sheryl Dris' blog)