1. Types of Chemical Reactions
Predicting Products Notes

2. Criss Cross
Review

3. Review: Writing Formulas
Elements in representative groups have a specific charge
Group 1: +1
Group 2: +2
Group 13: +3
Group 15: -3
Group 16: -2
Group 17: -1

4. Review: Writing Formulas
Reminders:
Positive ion first, negative ion second
Cations are metals
Anions are nonmetals

5. Review: Writing Formulas
Write out the ions (atomic symbol with charge)
Charge is memorized (representative groups)
Or look on polyatomic ions sheet
Transition metals should be given to you in the problem or work backwards from the given formulas
Criss cross the charges.
The charge on one ion becomes the subscript of the other ion.
ADD THIS TO NOTES: If more than one polyatomic ion, need to use parentheses!
Let’s practice #1-10

6. Predicting
Products

7. Diatomic Molecules Review
There are 7 diatomic elements
These elements exist in nature in a diatomic state
Two atoms bonding together
Always use the subscript 2 if any of these elements are a product
H2, O2, Br2, F2, I2, N2, Cl2

8. Diatomic Molecules Review
How do you remember them?
HOBrFINCl

9. Synthesis Reactions
Two or more substances react to form a single product.
A + B  AB
TO I.D. - THESE HAVE TWO SIMPLE REACTANTS
With synthesis, your job is to determine the ONE substance being formed.
Steps:
Write a compound that contains all of the reactants
Use the criss cross method to write the new compound

10. Synthesis Practice
Note: All transition metals below (Ni and Cu) have a 2+ charge.
1) Ba + O2  ___________________
2) Li + Br2  ___________________
3) Ni + F2  ____________________
4) Cu + CO32-  __________________
5) Cu + O2  ____________________

11. Decomposition Reactions
A single compound breaks down into two or more substances
AB  A + B
TO I.D. - THESE HAVE ONE REACTANT
With decomposition, your job is to determine what the compound is breaking down into
Steps:
Attempt to break the compound into two elements or two compounds
Split the single substance into two parts
Don’t forget diatomic molecules

12. Decomposition Practice
1) CaCO3  ______________________________
2) Al2(CO3)3  _____________________________
3) HClO3  _______________________________
4) Mg(OH)2  _____________________________
Don’t forget:
HOBrFINCl

13. Combustion Reactions Hydrocarbon reacts with O2 to produce CO2 and H2O
CxHy +O2  CO2 + H2O
TO I.D. – CH COMPOUND REACTING WITH OXYGEN
Steps:
Products are always CO2 and H2O

14. Combustion Practice
1) CH4 + O2  ___________________________ 2) C10H22 + O2  _________________________ 3) CH3OH + O2  ________________________ 4) C12H22O12 + O2  _______________________

15. YOU TRY: IN-CLASS PRACTICE
Identify the type of reaction & then predict the products.
1) NH3 
2) H2 + O2 
3) H2S 
4) LiClO3 
5) CH4H10 + O2 

16. YOU TRY: IN-CLASS PRACTICE
Identify the type of reaction & then predict the products.
6) CaO 
7) Na + I2 
8) NaHCO3 
9) Al + O2 
10) HgO 
11) Ag + S 
(Ag is +1)

17. Single Displacement Reactions
One element replaces another element in a compound
A + BC  AC + B
TO I.D. – ONE ELEMENT & ONE COMPOUND IN THE REACTANTS
Steps:
Use the activity series to determine if the single element will replace the first element in the compound
The single element will bump the other one out only if it is HIGHER (more reactive) than the other element
If the single element is NOT higher, then there is NO REACTION
Watch diatomic molecules (HOBrFINCl)
Example: H becomes H2

18. Single Displacement Practice
Activity Series
Cs Cesium
Li lithium
Rb Rubidium
K potassium
Sr strontium
Ba Barium
Ca calcium
Na sodium
Mg magnesium
Al aluminum
Mn manganese
Zn Zinc
Cr chromium
Fe iron
Cd cadmium
Co cobalt
Ni nickel
Sn tin
Pb lead
H hydrogen
Sb antimony
As arsenic
Bi bismuth
Cu copper
Hg mercury
Ag silver
Pd paladium
Pt platinum
Au Gold
Nonmetal F Cl Br I
1) Cu (1+) + AgNO3 
2) Ag + Cu(NO3)2 
3) Zn (2+) + H2SO4 
4) Fe (2+) + H3PO4 
5) Ba + AuSO4 
6) Na + MgCl2 

19. Double Displacement Reactions
Negative ions switch compounds
AB + CD  AD + CB
TO I.D. – TWO COMPOUNDS IN THE REACTANTS
Steps:
In each compound, identify all of the positive and negative charges
Switch the negative ions (OR can switch both of the positive ions)
Criss method to determine new compounds

20. Double Displacement Practice
Silver (Ag) is always +1 and zinc (Zn) is +2
To chemical reactions reference sheet: Add NH4+1
Double Displacement Practice
1) BaCl2 + Na2CO3 
2) Al2 (SO4)3 + H3PO4 
3) HNO3 + NaCl 
4) NH4Cl + Ba(OH)2 
5) AgClO3 + Ni(NO3)2 
6) PbCl4 + H3PO4 

21. YOU TRY: IN-CLASS PRACTICE
Identify the type of reaction & then predict the products.
MgCl2 + KBr 
Ag + KNO3 
Pb(NO3) KI 
Zn + AgNO3 
Al + H2SO4 

22. YOU TRY: IN-CLASS PRACTICE
Identify the type of reaction & then predict the products.
ZnCl2 + KOH 
Mg + HCl 
Mg(OH)2 + HCl 
Sn(+2) + PbSO4 
Zn + Fe2(SO4)3 
Al + HCl 