1. Today’s Date: 11/14/2016 PLEASE NOTE: Question of the Day!:
Directions: Come in and make sure you grab all papers from the front cart. Get started on your Question of the Day (QOD) as soon as you enter!
PLEASE NOTE:
Have your notebook out!
Question of the Day!:
List the symbol for the first 10 elements on the Periodic Table. (Use the table on the wall as a resource!)
Don’t forget about your mood meter!
Class Agenda
Answer QOD
Physical and Chemical Properties and Changes Review Notes
Pre-Lab – DUE THURSDAY!
Drawing Atoms Practice

2. Chemical and Physical Changes
And a review of chemical and physical properties

3. Examples of Physical Changes:
Includes changes in shape or size:
crumpling a sheet of paper
melting an ice cube
casting silver in a mold to make a ring
breaking a bottle
Flattening a the space needle
Grinding coffee
Includes Phase Changes: “melting, boiling, freezing, sublimation, condensation, deposition”

4. Physical Change: changes in the state or form of a substance but NOT a change in the chemical composition. The same element or molecules are present before and after.
i.e.- melting gold coins into gold bricks

5. Physical Changes

6. Lets looks at different physical properties…

7. Physical Properties of matter
These are the physical characteristics you can observe without change the chemical composition of the substance:
Appearance/ Color/ Odor
Texture/ hardness/ Luster (shiny)
Density
Melting point/ Boiling point
(4 more to go...)

8. Physical Properties of matter continued
Magnetism (yes or no)
Solubility = the ability to dissolve in water
Electrical conductivity = the ability to transport an electrical charge
Malleability= how easily something can bend or be shaped

9. Energy and Physical Changes
Physical changes are concerned with energy and states of matter.
Adding or removing energy from a substance can change its physical make up or the state of the matter
It takes energy to do physical changes like crushing a can.

10. Examples of Chemical Changes
Running a car on gasoline
Digesting food
A rotten log degrading into soil
Burning wood
Reactivity = reacts with acid or base
When things “rust, corrode, tarnish, rot, burn”

11. Let’s Talk about Chemical Changes
Chemical Change: a change that converts the chemical composition of a substance into different chemical substances with different chemical make up. (The atoms will rearrange)
i.e.- plants doing photosynthesis- turning water, CO2, and light into O2 and sugars

12. Big Hint for Chemical Change =
You will not have the same stuff at the end, and you can’t go back to what you started with
At least not without another reaction

13. Chemical Changes

14. Chemical changes we have (hopefully) seen before…
Burning a candle is an example of a combustion reaction
(Wax + O2  CO2 + H2O + heat energy)
More chemical changes to come…
Cooking often a
chemical change
because you can’t
go back to the original
form of the food
(Fried egg)

15. Combustion reaction (chemical change example)
Organic matter (like wood, cotton, or paper ) is made up of Carbon, Hydrogen, and Oxygen.
When organic matter burns
Organic
molecules O2  CO2 + H2O + HEAT energy
(Carbon
Hydrogen, Oxygen) Carbon Dioxide + Water
(REACTANTS)  (PRODUCTS)
Click to make this go away!

16. Chemical Properties of matter
Chemical properties of matter describe its potential to undergo some kind of chemical change or reaction because of what it is composed of:
Reacts with acid
Potential to ignite or burn (flammable), light
Produce a gas or precipitate
Alcohol fermentation – like making wine or beer
Chemical changes in color because of new product

17. Energy and Chemical Changes
Energy may be needed to make the chemical reaction occur
energy going into the system
Like lighting a match or fireworks
Other??
Energy may be a result of the reaction
energy coming out of the system
Exothermic = (“out” “heat”) Heat released
Warm/hot to the touch
Example?
Endothermic= heat is lost or removed (“heat loss”) – cold to the touch

18. What other physical properties does he describe that were not on this presentation?
What evidence can you look for to show there has been a chemical change?
Give 4 examples from the video. Are they demonstrating a physical or chemical change? How do you know?

19. Structure of Water

20. Pre-Lab! Do it!
All questions need to be 100% correct before you can start your lab on Thursday!
There is a front and a back side!
DONE?! Work on Elements, Compounds, Mixtures Review! (You might need a text book)