Physical and Chemical Changes

Physical Changes CChanges that alter the size, shape, location or state(S,L,G) but not the final product

What Other Kinds of Changes Are Physical? CCutting TTearing SShredding SShrinking EEnlarging CChange in Phase RRelocating RRotating

Chemical Changes  Changes that alter the chemical make up of the substance being changed.

Basically What You’re Telling Me Is…  If you end up with a chemical or chemicals that you did not start with, It is a chemical change!!!!!!!

An Example Is…  Eating…

Signs That a Chemical Change has occurred CCCCreation of a gas (bubbles) CCCCreation or loss of heat FFFFire RRRRotting PPPPrecipitate (Sour milk clumps) CCCCooking RRRRusting (oxidation)

What is density?  Density is how much matter there is in a certain amount of space.

Density triangle

What is density?  Density = mass OR mass ÷ volume. volume  Units for density: g or g cm 3 mL  Why are these the units for density? ALWAYS REMEMBER UNITS!

 Frank has a paper clip. It has a mass of 9g and a volume of 3cm 3. What is its density?  Frank also has an eraser. It has a mass of 3g, and a volume of 1cm 3. What is its density?

 Jack has a rock. The rock has a mass of 6g and a volume of 3cm 3. What is the density of the rock?  Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm 3. What is the density of the gel pen?

Now, try these on your own.  Alicia has a watch. It has a mass of 4g and a volume of 2cm 3. What is the density of the watch?  Mia has a wallet. It has a mass of 15g and a volume of 5cm 3. What is the density of the wallet?

Density Table SINK or FLOAT In Water (D = 1.0 g/mL) Float Sink Float (alcohol) (fuel)

Liquid Layers  Which layer has the highest density?  Imagine that the liquids have the following densities:  10g/cm 3.3g/cm 3.  6g/cm 3.5g/cm 3.