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Biochem 1: Properties of Water

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Biochem 1: Properties of Water Biochem 1: Properties of Water Presentation Transcript

  • BellRinger
    • 1) What is a molecule?
    • 2) If you had to guess, what do you think the term “organic macromolecules” means?
    • Mr. Bowden will collect:
      • Illustration of the Nitrogen Cycle
      • NOTES: Biogeochemical Cycles
      • Sub Assignment: Atoms & Molecules
  • Agenda
    • Collect Homework:
      • Illustration of Nitrogen Cycle
      • Notes: Biogeochemical Cycles
    • Collect Sub Assignment:
      • Atoms and Molecules Worksheet
    • GUIDED NOTES: Biochemistry & Properties of Water
      • Students practice drawing molecules
      • Review Questions
  • INTRODUCTION TO BIOCHEMISTRY
  • ATOMS
    • Everything in the universe is made of tiny particles called atoms
    • Atoms are very, very small. More than 2,000,000,000,000,000,000,000,000,000 atoms make up a single drop of water.
  • ATOMIC SYMBOLS
    • The names of Atoms are abbreviated with 1 or 2 letters called the Atomic Symbol.
    • The Atomic Symbol of every type of atom is listed in the periodic table
  • MOLECULES
    • Molecules are groups of atoms that have been bonded together.
    •  
    H 2 O C 6 H 12 O 6 CO 2
  • MOLECULAR FORMULAS
    • A formula lists the atoms that make up a molecule.
    • If an atomic symbol is followed by a small number then that number is how many atoms of that kind are found in the molecule
    • Example: NH 3 = 1 Nitrogen, 3 Hydrogen
  • ORGANIC MACROMOLECULES
    • “ Organic” is a word that means Living.
    • “ Macro” is the opposite of “Micro”, so it means Large.
    • Organic Macromolecules are large molecules that are found within living things
    • Organic molecules are mostly made up of 4 elements:
      • Carbon
      • Hydrogen
      • Oxygen
      • Nitrogen
  • TYPES OF MACROMOLECULES
    • Macromolecules are made by joining together small units called monomers to form long chains called polymers.
    • There are 4 types:
      • Carbohydrates
      • Lipids
      • Proteins
      • Nucleic Acids
  • PROPERTIES OF WATER
  • Water Molecules
    • A water molecule (H 2 O), is made up of three atoms --- one oxygen and two hydrogen.
  • POLARITY
    • Water is a neutral molecule, because the negative charges are balanced by the positive charges.
    • However, water molecules are polar, meaning they have a partially positive side and a partially negative side.
    • This polarity is due to an uneven distribution of electrons between the oxygen and hydrogen atoms.
  • POLARITY OF WATER
  • HYDROGEN BONDING
    • When it comes to electric charges, opposites attract. The positive end of one water molecule is attracted to the negative end of another.
    • This electrical attraction between water molecules forms a connection that scientists call a “Hydrogen Bond”
  •  
  • Properties of Water
    • 4 important properties of water:
      • Cohesion
      • Adhesion
      • Resistance to Temperature Change
      • Less Dense as a Solid
  • Cohesion
    • Attraction between particles of a substance. Cohesive substances stick together.
    • Results in surface tension that produces a film allowing insects to walk on the surface of water
  • ZeroG Water Balloons
  • Adhesion
    • Attraction between two different substances.
    • Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton.
    Attached to a silken spider web Form spheres & hold onto plant leaves
  • Capillary Action Magic Trick
  • Resistance to Temperature Change
    • Water resists temperature change, both for heating and cooling. It can absorb or release large amounts of heat energy with little change in actual temperature.
    • This is because the hydrogen bonds between water molecules work to keep things in a liquid state.
  • Water is Less Dense as a Solid
    • Ice is less dense then liquid water. That is why ice floats
    • Molecules in Liquid Water are constantly breaking and reforming hydrogen bonds, meaning they are close together.
    • Frozen water forms a crystal-like lattice whereby molecules are spread out at fixed distances.
  • Water Ice
  • Assignments
    • Drawing and Reading Molecules
    • Review Questions
  •  
  •  
  • Assignments
    • Drawing and Reading Molecules
    • Review Questions