1. Resources
Mrs. Lehner
Mr. McCollum

2. Law of Conservation of Matter
Matter cannot be created nor destroyed
Atoms are always accounted for
Remember atom inventory?!?!?!

3. Everything on this planet is composed of a combination of the about 90 elements found in nature – including you!!
·   Each element is composed of atoms of the same type
·  Different elements are composed of different types of atoms        

4. ATOMS VS. MOLECULES
Atoms – The atom is the smallest part of the simplest form of matter.
Elements – The simplest form of matter
·      
      Molecules – Two or more atoms bonded together (of the same or different elements) – like O2 or like H20

5. 2H2 + O2 2H2O
Reactant: Starting Material, found on LEFT side of arrow
Product: What is made, found on the RIGHT side of arrow
Subscripts: little numbers, tell how many atoms of the element it follow (unless there are parenthesis)
Coefficients: Big numbers in front of molecules, multiplied by everything after it, until you hit the end of the atom/molecule

6. LAW OF CONSERVATION OF MASS
Mass is NOT created or destroyed in a chemical reaction (so you better have the same number of atoms of each element before and after chemical reaction….or Mama Nature is going to be Mad!!)

7. Balancing Equations
If matter cannot be created nor destroyed, then there has to the same amount of atoms in products and reactants

8. Practice __Zn + __HCl ----> __ZnCl2 + __H2
__CH4 + __O2 --> __CO2 + __H2O
__Fe + __O2 ---> __Fe2O3
__NaCl + __BeF2 --> __NaF + __BeCl2

9. A.5 Resources
Materials that can be withdrawn from the natural environment to satisfy human needs
Renewable: Can be replenished through by natural processes
Non-Renewable: Cannot be replenished or take long periods of time

11. Waste Waste: generated by anything we no longer need Limiting Waste
Ex: Cheerios Box, Newspaper
Each person throws about 4 lb of stuff a day
Limiting Waste
Recycling: Reforming into new materials
Re-using: Using the same materials
Which is better??