1. (AKA: Soap opera Chemistry)
Predicting Products
(AKA: Soap opera Chemistry)

2. Why are we learning this?
Chemistry Standard #3A:
Students know how to describe and balance chemical reactions

3. Five types of reactions:
Synthesis (Combination)
Decomposition
Single Replacement
Double Replacement
Combustion

4. 1. Synthesis (or Combination)
2 or more substances react to form 1 product
A + B  AB

5. The soap opera begins . . .
Rob
+ Sally
 Rob/Sally  +

6. Demo #1: Synthesis Reaction
Remember to balance the equation! 2 2
Mg(s) + O2(g) 
MgO(s)

7. A compound breaks down into simpler substances.
2. Decomposition
A compound breaks down into simpler substances.
-requires heat, light, electricity, or a chemical catalyst
AB  A + B

8. Drama with Rob and Sally . . .
Rob/Sally 
Rob
+ Sally  +

9. Demo #2: Decomposition Reaction
Remember to balance the equation!
H2O2(aq)  KI 2 2
H2O(l) + O2(g)

10. 3. Single Replacement Reaction
Atoms in single element replace atoms in compounds
Can be cationic or anionic . . .
A metal replaces the cation in the compound
A nonmetal replaces the anion in the compound
Cationic SR: A is a metal element, B is cation (+)
A +BC  AC + B
Anionic SR: C is a non-metal element, D is anion (-)
C + BD  BC + D

11. How can you know if one metal will displace another?Li K Ca Na Mg Al Zn …
reactive metal replaces any below it.
Will this React?
Mg + ZnCl2 
Mg + CaCl2 
YES !
MgCl2 + Zn NR

12. Along comes Brian . . .
Brian
+ Rob/Sally 
+ Rob
Brian/Sally +  +

13. Demo #3: Single Replacement Reaction
Cu(s) + AgNO3(aq)  Ag(s)+ CuNO3(aq)

14. 4. Double Replacement Reaction
Compounds exchange cations
AB + CD  CB + AD

15. Drama at the prom . . .  + + Rob/Pam + Brian/Sally  Brian/Pam
+ Rob/Sally + + 

16. Demo #5: Double Replacement Reaction2 2
Cu(NO3)2(aq)+ NaOH(aq) Cu(OH)2(aq) NaNO3
Remember to balance the equation!

17. 5. Combustion
An element/compound reacts with O2 producing heat &/or light.
Example: Mg(s) + O2(g)  MgO(s)
with hydrocarbons yielding CO2 and H2O
Example: C3H8 + O2  CO2 + H2O

18. The Soap opera Ends 
Brian O2  CO2 + H2O 
Oh No!
(A hydrocarbon)

19. 2 2 2 Remember to balance the equation! Demo#6: Combustion
To get our H2, we will first do a single replacement rxn:
Zn HCl  ZnCl H2
H2 + O2  H2O + Energy! 2 2 2
Remember to balance the equation!