1. 3.3 Physical and Chemical Changes
Pages 86-90
By Lester Green Smallwood Academy Gambo

2. 1.24 Describe changes in the properties of materials that result from some common chemical changes.
See text pages 88-89

3. 1.24.1 Distinguish between physical and chemical changes.
Physical Change
Occurs when there is a change in matter (state: solid, liquid or gas)
There is NO chemical bonds are made or broken

5. continued…
Chemical Change Occurs when chemical bonds are formed or broken
At least one NEW
substance is formed

6. Chemical or Physical Chemical Physical Chemical Physical
Chemical changes produce new substances (elements or compounds) but physical changes do not.
Chemical or Physical
Hydrogen reacts with oxygen to produce water.
Ice (water in solid state) melts to form liquid water.
Sodium reacts with chlorine to produce table salt
Creating fog at a rock concert by subliming dry ice
Chemical
Physical
Chemical
Physical

7. 1.24.3 List examples of physical changes and chemical changes
Change of state
Corrosion
Cutting things
Fruit ripening
Combustion
Dissolving

8. Worksheet: Classify as Chemical Change Physical Change Both
continued…
Worksheet:
Classify as
Chemical Change
Physical Change
Both

9. 1.24.4 List evidence that a chemical change may have occurred
Heat is absorbed or released
A new color appears
A precipitate is formed
A gas is produced
Process is difficult to reverse
(Note: Evidence for a chemical change text page 89)

10. 1.24.5 Recognize that during a chemical change, elements are conserved but compounds are not.
(NOTE: Equations are not balanced)
NaCl--- Na + Cl2
CH4 + O2--- CO H2O
NaCl + BeF2-- NaF + BeCl2

11. 1.25 Use tools and apparatus safely
Core Lab 3.3C:
Observing Changes in Matter

12. 1.26 Identify new questions about physical and chemical changes that arise from investigations
Core Lab 3.3C:
Observing Changes in Matter

13. 1.27 Organize data using a format that is appropriate to the task or experiment
Core Lab 3.3C:
Observing Changes in Matter

14. 1.28 Determine if changes in a object is physical or chemical based on experimental data
Core Lab 3.3C:
Observing Changes in Matter