Unit  4: Changes in Matter and Chemical Reactions 

• Chemical Formulae 

• Molecular Formula - Symbols, Formulas, Definition and Examples | CK-12 Foundation 

• Determining Molecular Formulas - Steps, Methods and Calculations | CK-12 Foundation 

• Homework

Molecular Mass and Mole Concept | CK-12 Foundation 

Molecular formula - Example 1 ( Video ) | Chemistry | CK-12 Foundation 

Unit 4: Chemical Reactions

Tyoes of reactions

Unit 4: Chemical Reactions

Types of reactions

• Homework

Writing Chemical Equations - Equations, Formulas, Symbols, Practice and Rules | CK-12 Foundation 

Balancing Chemical Equations - Equations, Formulas, Steps, Examples and Laws | CK-12 Foundation