Biology- The study of life and living things

Unit 1 Biochemistry and Cell Theory Chapter 2- Atom Review

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

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

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

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

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

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

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

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

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

Chemical Bonds An attraction between atoms that hold them together.

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

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

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

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

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