- 
                  
Physical Science
 - 
                  
Elements, Compounds, Pure substance, Mixture
 - 
                  
Edad 14-18
 - 
                    
level: 8th through 11th grade
 - 
                  
English
 
Author's Instructions
Elements vs. Compounds video notes
- 
                  
Physical Science
 - 
                  
Elements, Compounds, Pure substance, Mixture
 - 
                    
Edad 14-18
 - 
                    
level: 8th through 11th grade
 - 
                  
English
 
Author's Instructions
Elements vs. Compounds video notes
