1. TYPES OF CHEMICAL REACTIONS

2. Synthesis Reaction – also called composition, two or more substances combine to form a more complex substance

3. A synthesis reaction is like two people who went to a dance separately and leave as a couple.+ =

4. AX
A X
Fe S
FeS

5. Decomposition reaction - a complex substance breaks down to form two or more simpler substances.

6. A decomposition reaction is like a couple (metal and nonmetal) go to a dance, then break up and leave as single people. = +

7. AX
A X
2H2O
2H O2

8. Single Replacement – One substance is displaced (moved) from its compound by another substance.

9. Single replacement is like a couple who go to a dance together, but break up and one of them leaves with someone else.

10. Single Replacement + +

11. Remember, metals combine with nonmetals
Remember, metals combine with nonmetals. If one thing is replaced, it is replaced by another thing like it.
Metal
Nonmetal +
Metal
Metal
Nonmetal
Metal +

12. +
Metal
Nonmetal
Nonmetal
Nonmetal +
Metal
Nonmetal

13.
A BX AX B or
A BX BA X

14.
Fe + CuS
FeS Cu or
Cl KI
2KCl I2

15. Double Replacement – The substances change places
Double Replacement – The substances change places. Remember, metals bond with nonmetals!

16. A double replacement reaction is like two couples who go to a dance
A double replacement reaction is like two couples who go to a dance. During the dance, they break up. Then they leave with the opposite member of the other couple.
REMEMBER: Metals bond with nonmetals! Check the valences!

17. Double Replacement + +

18. Double Replacement
Na2S + AgCl NaCl + AgS

19. Be + Li2O BeO + 2Li 2Mg + 2Cl2 2MgCl2 CaI2 Ca + I2 BaF2 + Na2S
Single Replacement
Be Li2O
BeO Li
Synthesis or Composition
2Mg + 2Cl2
2MgCl2
Double Replacement
BaF2 + Na2S
BaS NaF
Decomposition
CaI2
Ca I2
Single Replacement
2K2O + 2Cl2
4KCl + O2