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Chemical basis of Life

Chemical basis of Life. Please Take out your notebooks. ATB 9/25. Get a textbook Turn to page 26 Answer the following questions in your notebook. What is the difference between a light microscope and an electron microscope? What is the difference between and TEM and an SEM?. ATB: 9/26.

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Chemical basis of Life

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  1. Chemical basis of Life Please Take out your notebooks

  2. ATB 9/25 • Get a textbook • Turn to page 26 • Answer the following questions in your notebook. • What is the difference between a light microscope and an electron microscope? • What is the difference between and TEM and an SEM?

  3. ATB: 9/26 • Get textbook • Turn to page 27 • Complete analyzing data questions 1-5

  4. ATB 9/27 • Turn to page 27 in book • What is the difference between a cell culture and cell fractionation? • Describe the process of cell fractionation.

  5. Biosphere Ecosystem Community Population Organism Levels of organization Organ System Organs Tissues Cells Atoms

  6. Vocabulary • Atoms are made up of protons, electrons, and neutrons. • Elements are pure substances that consists entirely of one type of atom. • Compound is a substance formed by the chemical combination of two or more elements in definite proportion. • Molecule is the result of atoms that are joined together by covalent bonds.

  7. Bonding • Ionic bonds are formed when one or more electrons are transferred from one atom to another. • Covalent bonds are formed when electrons are shared between atoms.

  8. Van der waals forces • When molecules are close together, a slight attraction can develop between the oppositely charged regions of nearby molecules.

  9. Elements you need to know • C • Ca • Cl • F • Fe • H • I • K • Mg • N • Na • O • P • S • Zn

  10. Water Molecules • Hydrogen and oxygen are held together by polar covalent bonds. • Polar because there is an uneven distribution of electrons between oxygen and hydrogen. • Multiple water molecules are held together by hydrogen bonds.

  11. Properties of water Adhesion Cohesion • An attraction between molecules of different substances. • Attraction between molecules of the same substance.

  12. Penny Lab • Problem: How many drops of water can a penny hold? • Design an experiment with your penny. • HW: Write your introductory paragraph for your lab report. Include information on Polarity, Van der Walls forces, adhesion, and cohesion.

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