1. The Evil Twin to Decomposition
Synthesis Reactions
The Evil Twin to Decomposition

2. Definition
Synthesis is a reaction in which two or more reactants yield only one new product
Two or more simpler reactants create only one more complex compound

3. Generic Word Equation Reactant + Reactant yields Product
Reactant + Reactant  Product

4. Algebraic Equation
A + B  AB

5. Examples with elements as reactants…
Sodium (S) + Chlorine (g)  Sodium Chloride (s)

6. Magnesium (s) + Bromine (l) 
Magnesium Bromide (s)

7. Aluminium (s) + Bromine (l)  Aluminium Bromide (s)

8. Hydrogen (g) + Oxygen (g) 
Water (g)

9. Iron (s) + Oxygen (g)  Iron (III) oxide (s)

11. What is tricky about the reactions with oxygen?
Hydrogen (g) + Oxygen (g)  Water (g)
Iron (s) + Oxygen (g)  Iron (III) oxide (s)
Why does the Iron (III) Oxide have a roman numeral?

12. What is the difference? Iron (III) Oxide vs. Iron (II) Oxide
Fe2O3 is not pretty, but FeO is just plain ugly!
FeO
Rust

13. Examples with Compounds as reactants
Carbon Dioxide (g) + Water (l)  Carbonic Acid (aq)
Nitrogen dioxide (g) + water (l)  Nitric Acid (aq)

14. Pictures courtesy of:

15. Pictures courtesy of: