1. Chemistry
The study of matter

2. Why study Chemistry in Bio?
Living things are made of matter
Carbon (C)
Hydrogen (H)
Nitrogen (N)
Oxygen (O)
Phosphorus (P)
Sulfur (S)
Metabolism = chemical
reactions

3. Atoms Building blocks of matter 3 parts: Protons (+)
Neutrons (no charge)
Electrons (-)
Protons = electrons,
therefore atoms have no charge

4. Elements Simple substances composed of only 1 kind of atom
Represented by symbols
Arranged in a Periodic table

6. Isotopes Atoms with same # protons, different # neutrons
Carbon-12 and Carbon-14
Some isotopes are radioactive
Useful in medicine
C-14 used to date fossils

7. Electron shell diagrams:
Help us understand how atoms will react
Electrons determine reactivity
Outer e- (valence) are
only ones able to
interact

8. How do I diagram??
Hydrogen
Lithium
Magnesium

9. Compounds
Substance formed by a chemical reaction of two or more elements in definite proportions
Represented by chemical formula
Examples: H2O NaCl CO2