P p intro to biochem #1
- 1. Chemistry of Life chapter 2 • Atoms - the basic unit of matter • Made up of 3 parts
- 2. Atomic structure • Protons (+) charge • Neutron (0) charge • Electrons (-) charge
- 3. Element • A pure substance that consist only one type of atom • EX: C,H,O,N
- 4. ISOTOPES • Atoms of the same element that have different # of neutrons
- 5. 28 1. Atomic # Ni 2. Element symbol Nickel 3. Name of atom 4. Average atomic mass 58.71
- 6. Compound • A substance formed when two or more elements combine in a definite proportions
- 7. Figuring out atomic structure How many protons, electrons, & neutrons does carbon have?
- 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. 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. Molecules and Bonding • more ways to view molecules
- 11. Chemical BONDS! • Chemical Bonds: Are the electrical forces linking atoms.
- 12. Molecules and Bonding Two Types! •Covalent Bonds: Are characterized by the sharing of pairs of electrons between atoms.
- 13. Molecules and Bonding Two Types! •Ionic Bonds: Are characterized by the Stealing or Giving of electrons between atoms.
- 15. Molecules and Bonding • How many bonds can an element make? Count the bonds for Carbon!
- 16. Properties of Water • Water is a Polar Molecule • Uneven Electrical Charge
- 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!