P p intro to biochem #1

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P p intro to biochem #1

  1. 1. Chemistry of Life chapter 2• Atoms - the basic unit of matter• Made up of 3 parts
  2. 2. Atomic structure • Protons (+) charge • Neutron (0) charge • Electrons (-) charge
  3. 3. Element• A pure substance that consist only one type of atom• EX: C,H,O,N
  4. 4. ISOTOPES• Atoms of the same element that have different # of neutrons
  5. 5. 28 1. Atomic # Ni 2. Element symbolNickel 3. Name of atom 4. Average atomic mass 58.71
  6. 6. Compound • A substance formed when two or more elements combine in a definite proportions
  7. 7. Figuring out atomic structure How many protons, electrons, & neutrons does carbon have?
  8. 8. Carbon• Atomic number = 6 • Atomic mass = 12 • (round atomic number to a whole #) • To calculate # of• Carbon will have 6 neutrons: protons & 6 electrons • Atomic mass 12 • - atomic # -6 • = neutron # 6
  9. 9. Lets try one more• Find the # of protons, • Chlorine: electrons, & neutrons • Atomic # is 17, for chlorine • It has 17 protons & 17 electrons • Atomic mass 35 • Atomic # -17 neutron # = 18
  10. 10. Molecules and Bonding• more ways to view molecules
  11. 11. Chemical BONDS!• Chemical Bonds: Are the electrical forces linking atoms.
  12. 12. Molecules and Bonding Two Types!•Covalent Bonds: Are characterized by thesharing of pairs of electrons between atoms.
  13. 13. Molecules and Bonding Two Types!•Ionic Bonds: Are characterized by theStealing or Giving of electrons betweenatoms.
  14. 14. Molecules and Bonding
  15. 15. Molecules and Bonding• How many bonds can an element make? Count the bonds for Carbon!
  16. 16. Properties of Water• Water is a Polar Molecule• Uneven Electrical Charge
  17. 17. Properties of Water• Water is essential for life!!!• 78% of the body is made up water• It is the universal solvent• The body’s chemical reactions require water!

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