1. Chapter 2: Chemistry

2. Composition of Matter Everything in the universe is made of matter
Mass is the quantity of matter an object has
All living things are made of the same kinds of matter as non-living things

3. Carbon Hydrogen Nitrogen Oxygen Phosphorous Sulfur
Elements
Elements are pure substances
More than 100 elements, but most of the mass of living things comes from:
C H N O P S
Carbon Hydrogen Nitrogen Oxygen Phosphorous Sulfur

4. Elements, Cont.

5. Chemical Symbols

6. Atoms

7. Atoms, Cont. 8 8 (18) Nucleus: Protons and Neutrons
Energy Levels: Electrons
8 8 (18)
Everyone’s goal: Fill the E.L.!

8. Compounds Substance made up of atoms of two or more elements: compound
Properties of elements differ from properties of compound
Compounds form to increase stability

9. Bonds
Covalent Bond: atoms share electrons (Molecule)

10. Bonds
Ionic: one atom donates, the other accepts electrons, becoming “charged” particles (ions)

11. Homework
Complete Worksheet (use your book and notes to help!)