1. Types of chemical reactions
Knowing the different types of reactions gives you the ability to predict what the products will be after the chemical reactions.
Remember: In all chemical reactions mass, charge and energy are conserved.

2. Synthesis A + B  AB NOTES
2 or more substances combine to form a more complex substance
Can be written in the general form:
Also called a combination reaction
A + B  AB

3. Putting Puzzle Pieces Together
Synthesis Reaction

4. Fe + S  FeS
4 click
2Mg + O2 
2MgO
H2O + SO3 
H2SO4

5. Decomposition AB  A + B NOTES
1 substance breaks down into 2 or more simpler substances
Can be written in the general form:
Also known as an analysis reaction.
AB  A + B

6. Decomposition Reaction
Breaking Apart a Puzzle
Decomposition Reaction

7. FeS  Fe + S
Two click
CaCO3  CaO + CO2
2NaCl 
2Na + Cl2

8. A + BX  B + AX Single Replacement NOTES
1 element replaces another that is in a compound.
There is ALWAYS a single element and a compound reacting.
This can be written in the general form:
A + BX  B + AX

9. Sharing among Children
Single Replacement Reaction

10. 2KCl + Br2 Zn + 2HCl  ZnCl2 + H2 2Na + CuSO4  Na2SO4 + Cu
Cl KBr 
Two Click
2KCl + Br2

11. Double Replacement AB + CD  AD + CB NOTES
2 substances in two compounds “switch” partners.
A compound always reacts with a compound.
This can be written in the general form:
AB + CD  AD + CB

12. Trading
Double Replacement Reaction

13. One click
NaCl + AgNO3  NaNO3 + AgCl
2K3PO CaS 
Ca3(PO4) K2S

14. Solving Synthesis Reactions

15. Na Cl -1 +1 Formula Writing
In ionic bonds, an electron is transferred between the atoms.
Example: -1 +1 Na Cl

16. We can get the charge of an atom by looking at the periodic table.
Formula Writing
We can get the charge of an atom by looking at the periodic table.

17. What is the charge of a phosphorous ion?
What is the charge of a magnesium ion?
What are the charges of the ions Lithium and Fluorine?

18. Na Cl -1 +1 Formula Writing
Once we have the charges, we crisscross the numbers to the subscript position. +1 -1 Na Cl

19. Formula Writing
So the final formula for sodium and chlorine is just Na Cl

20. What is the formula for Na and Br?
What is the formula for Mg and Cl?
What is the formula for Rh and O?

21. H2 + 02  ???? Solving Equations So now we can write formulas
We can identify synthesis reactions
Lets put it all together.
H 
????

22. Solving Equations
Step 1: Look up the oxidation states for each element on the periodic table.
H 

23. Solving Equations
Step 2:Crisscross
H 

24. Solving Equations
Step 3: Rewrite
H 

25. Solving Equations
Step 4: Balance the Equation
H2+ 02
H2O

26. Solve the following equation Na + F2  ???

27. Solve the following equation H2 + P  ???

28. Solve the following equation Sr + N  ???

29. Decomposition AB  A + B NOTES
1 substance breaks down into 2 or more simpler substances
AB  A + B

30. Decomposition Reaction
Breaking Apart a Puzzle
Decomposition Reaction

31. FeS  Fe + S
Two click
CaCO3  CaO + CO2
2NaCl 
2Na + Cl2

32. Decomposition Reactions
Decomposition reactions are the same as synthesis reactions, only in reverse.
2H2O  2H2 + O2
2H2 + O2  2H2O

33. H2 N2 O2 F2 Cl2 Br2 I2 Diatomic Atoms
I2 Br2ing Cl2ay F2rom O2ur N2ew H2ouse
When breaking a compound apart, you must remember that not all elements stay alone.
Elements that naturally bond with themselves are called Diatomic H2 N2 O2 F2
Cl2
Br2 I2

34. Decomposition Reactions
NaCl 
SrF2 

35. 1. MgBr2  2. Na2O  3. HCl  Practice:
Complete the following decomposition reactions
1. MgBr2 
2. Na2O 
3. HCl 

36. AB + C  AC + B AB + C  CB + A Single Replacement NOTES
1 substance in a compound replaces another.
An element reacts with a compound.
AB + C  AC + B
AB + C  CB + A

37. Sharing among Children
Single Replacement Reaction

38. Why do single replacement reactions occur?
NOTES
Why do single replacement reactions occur?
A more reactive element replaces a less reactive element

39. 2KCl + Br2 Zn + 2HCl  ZnCl2 + H2 2Na + CuSO4  Na2SO4 + Cu
Cl KBr 
Two Click
2KCl + Br2

40. Single Replacement Reactions
In a single replacement reaction, one element replaces another in a compound.
Sr + 2HCl  H2 + SrCl2

41. Formulas
Remember, the first element in a compound’s formula is the cation (positively charged ion).
The second element in a compound’s formula is the anion (negatively charged ion)

42. BeCl2 + Na Be + NaCl  Who to Replace?
Step 1: What is the potential charge on the single element?
Step 2: Which element in the compound has the same type of charge? 2+ 1+ 1-
BeCl2 + Na
Be + NaCl 

43. Complete the following reaction: Li + NaCl 
O2 + NaCl 

44. But will it happen?
In order for one element to replace another, it must be higher on Table J than

45. Check Your Homework… Any Questions?
5. 2Na + 2HOH  H2 + 2NaOH 6. B + 3KF  3K + BF3 7. Ba + BaS  Ba + BaS 8. Ca + 2HOH  H2 + Ca(OH)2

46. Double Replacement AB + CD  AD + CB NOTES
2 substances in a compound “switch” partners.
A compound reacts with a compound.
AB + CD  AD + CB

47. Trading
Double Replacement Reaction

48. Why do double replacement reactions occur?
NOTES
Why do double replacement reactions occur?
One of the products must form as a gas, a precipitate or as water

49. Also known as… ionic reaction or solution reaction

50. One click
NaCl + AgNO3  NaNO3 + AgCl
2K3PO CaS 
Ca3(PO4) K2S

51. Double Replacement Reactions
In a double replacement reaction, two ions switch places in two compounds. Na F Li Cl

52. Double Replacement Reactions
Once you have identified which two will switch (by looking at the charges), complete the switch and rewrite the formula. Na N+ Mg
O  3

53. Double Replacement Reactions
KF + SrO 

54. Practice: NaCl + BeF2

55. Practice: MgO + KCl

56. Practice: BaBr2 + K2O

57. Polyatomic Ions
Polyatomic Ions are multinuclear ions that can be treated as a group of atoms with a charge.

58. K 1+ 2+ CN 1- 1- Sr 2+ 1+ 2-
( )
SO3 2- 2 2

59. Complete: Ba(NO3)2 + K2C2O4

60. Complete: NaHCO3+ HCl