1. Chapter 8: Equations and Types of Reactions
Chemistry A
Time Frame 3-5 days
Explain what’s happening in this picture before you continue the notes

2. Evidence of Chemical Reactions
A brief video review of the indicators of a chemical change (unavailable online)

3. Parts of a reaction Reactants Products Subscript State of Matter
Coefficient
Arrow means “to yield”

4. Law of Conservation of Matter
The Law of conservation of matter states that matter cannot be created or destroyed, it can only change forms. Therefore, in a chemical reaction the number of atoms, the mass and the charge must be conserved.
This means it is the same on both sides of the arrow.

5. Take Inventory! Reactants Products 4 hydrogens 4 hydrogens 2 Oxygen
2 oxygens
To be Balanced they must have the same number of atoms of each elements

6. Practice
Inventory the following reaction:

7. Online Balancing Tutorials
Let’s try this:
Chembalancer Lab
Another Video to review our ideas

8. More Practice
Zn O2  ZnO
HI + H2  H2 + I2

9. Types of Reactions Reactions are classified into several categories.
Combination A + B  AB
Decomposition AB  A + B
Single Replacement A + BC  AC + B
Double Replacement AB + CD AD + CB
Combustion CxHy + O2 CO2+ H2O

10. Combination ___K +___Br2  ___KBr
Also known as composition or synthesis
___K +___Br2  ___KBr 2 1 2
Note the diatomic element is written with a supscript!

11. ____Zn + ___I2 ____ ZnI2 Composition 2 1 1 1 Another diatomic

12. Decomposition
Single Substance breaks down into two or more simpler substances

13. Single Replacement ___Cu + __AgNO3  __Cu(NO3 )2 + ___Ag
A single element replaces a combined element in a compound.
___Cu + __AgNO3  __Cu(NO3 )2 + ___Ag 2 1 2 1

14. Double Replacement Contains four compounds with metals trading places.
___AgNO3 + ____NaCl  ____NaNO3 + ____AgCl

15. Combustion Reactions
Involve burning

16. Writing Equations from words
Write the formula for each reactant and each product.
Your formula MUST be correct. That’s why we learned the polyatomic ions!
Remember the diatomic elements H, O, F, Br, I N, Cl. The are written H2, O2, F2, Br2, I2, N2 and Cl2
Add the symbols for states of matter
Take inventory of the equation and balance

17. Examples- try them yourself
Magnesium reacts with oxygen gas to form magnesium oxide.
When copper reacts with silver nitrate solution to form silver and copper(II)nitrate solution.
2 Mg + O2  2 MgO
Cu + 2 AgNO3  Cu(NO3)2 + 2 Ag
This is on the test!

18. Predicting Products Steps Example
Determine what type of reaction is being presented.
Write the correct formulas for the product(s).
Balance the equation.
Example
Al + CuSO4 
CaCl2 + Al(OH)3 
Al2(SO4)3 + Cu
Ca(OH)2 + AlCl3
Hint: DR
This is on the test!