1. December 12, 2016 Today in Class you will need: Pen/ Pencil
Paper/ Notebook
Today’s Schedule: Matter Continued

2. Q & A
When doing density problems what are the units that represent volume, mass, and density?
Volume= ml or cm3
Mass= g
Density= g/ml, or g/cm3

3. Matter Cont’d
Other than Physical Properties, matter also has Chemical Properties. Chemical Properties can only be observed when one substance can interact with another.
Ex: Dynamite + Flame + Oxygen= Explosion (Combustion)

4. Matter...
Reaction with Acid: ability of a substance to react with acid.
Ex: Magnesium + Acid = Gas + Metal Disappears (Reaction)
Gold + Acid= No Change (No Reaction)

5. Q/A- Physical or Chemical Property
Blue colour
Flammability
Boils at 100 degrees
Reacts with H2O to form gas
Hardness
Rusting

6. Physical Change
Physical Changes occur when matter changes its property but not its chemical nature.
Include: Texture, shape, size, colour, volume, mass, density, weight

7. Physical Changes

8. Chemical Changes
Chemical Changes occur when matter becomes something new or different.
Ex: Fireworks- are metals like magnesium and copper. These go through a chemical change to light up the sky.
The Chemistry of Fireworks

9. Chemical Change or Physical Change
What happens when stuff dissolves?

10. Clues That it is a Chemical Change
Heat or Light is given off
A new colour appears
Bubbles of gas are formed

11. A solid material (called a precipitate) forms in a liquid
The Change is difficult to reverse. i.e. Fire

12. Demo Exit Question Hypothesis: (Pre) Chemical Change: (Post)
Write down an hypothesis regarding what you think is going to happen when hydrogen peroxide solution mixes with the yeast solution.
Chemical Change: (Post)
How do we know this is a chemical change?