1. Biology-
The study of life and living things

2. Unit 1
Biochemistry and Cell Theory
Chapter 2- Atom Review

3. Biochemistry
The science that deals with the chemical processes of living matter

4. Atom Smallest particle of an element Example- one atom of Helium
Oxygen
Carbon
etc

5. Atomic Structure- (the sub-atomic particles)
Proton
located in the nucleus
positive charge
mass of 1 amu
Neutron
no charge

6. Atomic Structure- (cont.)
Electron
orbits the nucleus
negative charge
very little mass

7. Atomic Number # on the periodic table- (p 142 in planner)
Equal to the number of protons for atom
# protons = # of electrons (neutral atom)

8. Atomic Mass The total mass of one atom of an element
neutrons + protons

9. Element Pure substance, only one type of atom.
Represented by a SYMBOL.
Ex. O, C, He, Ne, Pb, K, Fe, Au

10. Isotope Atoms with a different ATOMIC MASS.
Due to a different number of NEUTRONS

11. Ion Atom with an ELECTRICAL CHARGE. Different number of ELECTRONS.
Gain e- = negative ion
Lose e- = positive ion

12. Chemical Bonds
An attraction between atoms that hold them together.

13. Covalent Bond Attraction due to the sharing of electrons.
Ex. p 33- water, carbon dioxide

14. Ionic Bond Attraction due to the transfer of electrons.
Ex. p. 34 sodium chloride

15. Compound- 2 or more atoms chemically combined in definite proportions
Represented by a CHEMICAL FORMULA. Gives the # and type of atoms present.
Ex. carbon dioxide- CO2
glucose- C6H12O6

16. Chemical Reactions (p36)
Represent how substances change from one form into another. (law of conservation of matter)
Represented by a CHEMICAL EQUATION.
Reactants  Products

17. All images- Clip Art