1. Changes in Matter
Chapter 2 Section 2

2. Physical Change
A physical change is any change that alters the form or appearance of matter
A physical change does not make new substances
A substance that undergoes a physical change is still the same substance after the change.

3. Physical Change
An example of a physical change is the change that water goes through when thermal energy is added
Solid H2O
Liquid H2O
Gas H2O

4. Changes in Shape of Form
Other examples of physical change include dissolving, bending, crushing, breaking, chopping, and anything else that changes only the shape or form.
This is an example of why you shouldn’t drink and a physical change, enjoy!..\..\..\..\..\Downloads\video.mp4

5. Chemical Change
A chemical change is any change in matter that produces one or more new substance.
A chemical change is also called a chemical reaction
There are different types of chemical reactions
A chemical change produces new substances with properties different from those of the original substance.
chemical change

6. Types of Chemical Changes
Change in color.
Change in odor
May produce a gas or precipitate ../../../../../Downloads/precipitate.mp4
Energy may be released or absorbed
Forms a new substance
Can NOT be easily reversed

7. Science Investigation
change observed
evidence of change
classify change as physical or chemical
smashed aluminum can
change of shape of the can
physical change
burnt toast
change of color/smell
chemical

8. Chemical Change or Physical Change??
List the physical properties of the solid
List the physical properties of the liquid
On a piece of paper crush the solid. Describe the changes that occur
Place some of the crushed solid in the cup and add 15 drops of the liquid
describe what happens, describe the change

9. Was this a chemical or a physical change?
Provide evidence to support your answer
Summarize the purpose of the lesson.
Create a hypothetical question, a “what if.”
Answer your “what if question”

10. Law of Conservation of Matter
The principle that the total amount of
matter is neither created nor destroyed during ANY chemical or physical change it is rearranged.
This law is also called the law of conservation of mass
Draw figure 15 on page 71

11. This is an example of a chemical reaction at the molecular level
Notice that the atoms on one side of the reaction are also on the other side of the reaction

12. Math - Analyzing Data (pg 72)
Propane Combustion
Mass of C3H8
Reacted (g)
Mass of O2
Mass of CO2
Produced (g)
Amount of water vapor produced 44
160
132
250
909
750
400
1,455
1,200
465
1,691
1,395

13. Explain your findings in terms of The Law of Conservation of Matter
Type of Matter
Foil
Ball of Foil
Pieces of Foil
Cookie
Pieces of Cookie
Properties
Weight in Grams
Explain your findings in terms of
The Law of Conservation of Matter

14. Law of Conservation Describe the experiment that you preformed
Explain the data that you collected
Explain your results in terms of
The Law of Conservation of Matter

15. Can you guess the correct answers and do better than this?