1. Chemical Properties
Physical Science

2. Questions, Questions, Questions…
On a piece of paper, write down one question you have about or would like to have answered within the context of CHEMISTRY!!!
When your done, crumple up the paper into a ball and hold onto it until you get further instructions!

3. Back to the Basics Matter – anything that has mass and volume
Substance – type of matter with a constant composition and can be identified by a chemical symbol or chemical formula and distinct properties.
Water, Salt, Aluminum
Element – any substance made up of only one type of atom
Oxygen, Helium, Iron
Compound – a substance in which two or more elements are combined
Chlorine Gas + Sodium metal = Sodium Chloride (salt)
Cl Na = NaCl

4. Element vs Compound

5. The Chemistry Behind the Science Fair Project Volcano
What do you notice happening when you mix baking soda and vinegar together??

6. Chemical Properties
Describes a specific chemical change that alters the composition of a substance
Reactivity
Flammability
Light Exposure

7. Chemical Changes
Any change that results in the formation of new substances
Examples:
Combustion – combines with oxygen and burns
Corrosion – weakening/discoloration of metals
Oxidation – substances combine with oxygen
In all examples… the key is that there is a formation of a new material!

8. Indications of Chemical Change
Gas Formation (Bubbles/Vapors)
Temperature Change
Endothermic – Energy is absorbed; temperature decreases
Exothermic – Energy is released; temperature increases
Formation of a precipitate
Precipitate – solid that forms when two liquids are mixed
Light Energy
Color Change

9. Something to think about…
Ever bite into an apple… then leave it on the counter and come back to it later and it looks like this??
Why do you think this happened?

10. Elephant Toothpaste… She said what????? Reaction
2 H2O2(aq) --> 2 H2O(l) + O2(g)
Let’s take a look!!
Is this reaction Endothermic or
Exothermic

11. Physical Science 9/22 Warm-up
What is the difference between a Physical Property and a Chemical property?
Give an example of a Physical Property
Give an example of a Chemical Property
What is an example of a Chemical Change?
Test back – turn into me if you want to retest!
Mini Quiz tomorrow!!
Chemical changes and properties

12. Revisiting yesterday…
Think of what you started with (the reactants)
List some of the Physical properties of your starting materials
Think of what you ended with (the product)
List some of the Physical properties of you final material
How would you identify that a chemical change occurred in this activity?
What are some Physical properties of your final product? Chemical properties?

13. What you couldn’t see…
Casein – protein in milk
Acetic Acid - vinegar

14. Being able to distinguish between the two…
As we have seen, there is a difference between physical and chemical properties. Lets generate a list…
Physical Properties Chemical Properties
There is also a difference between physical and chemical changes. Lets generate another list…
Physical Change Chemical Change

15. Class work… In your packets, work on the last 4 pages
This is help prepare you for your quiz tomorrow!