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Chemical polarity

AP Bio Chapter 3 notes

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Chapter 3 ? Water & Fitness of the Environment Effect of Water?s Polarity Polarity of water causes hydrogen bonding Water is made up of 2 hydrogen and 1 oxygen; held together by 1 covalent bond Oxygen is slightly negative and hydrogen is slightly positive ?> polarity Polarity causes hydrogen to be attracted to other oxygen molecules, creating hydrogen bonds; each molecule can be connected to 4 other molecules 4 properties of water Water?s cohesion Stabilization of temperature Expansion upon freezing Versatility as a solvent Cohesion of water molecules Hydrogen bonds keep water molecules sticking together - hydrogen bonds are very weak; they form and reform with great frequency Cohesion: the process in which hydrogen bonds hold the substances together

Chapter 3 Notes

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Joey Miller AP Biology Chapter 3: Water and Life The Molecule that Supports Life Water is the biological medium here on Earth. Water is the only common substance to exist in the natural environment in all three physical states of matter. The solid state of water floats on the liquid, a rare property emerging from the chemistry of the water molecule. Polar Covalent Bonds in Water Molecules Result in Hydrogen Bonding Polar Covalent Bonds ? the electrons of the covalent bonds spend more time closer to one atom than another atom Polar Molecule ? The overall charge of a molecule is unevenly distributed

Biology Chemical Bonds PPT

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Biol 210 General Biology 1 Lecture 2 Review Chemical Bonds Atomic Structure Nucleus Protons, mass = 1, charge = +1 Neutrons, mass = 1, charge = 0 Electrons Mass = negligible Charge = -1 # e? = # protons Outer shell (most energenic) e??s form chemical bonds Isotopes Some isotopes are stable, such as 1H2 Other isotopes are unstable, such as 1H3. When tritium decays, it gives off ? particle. Because the mass of an element includes the average isotope abundance, the mass and the atomic weight differ slightly Helium, He, atomic number 4, mass 4.003 Important Elements C HOPKINS CaFe Mg C = carbon H = hydrogen O = oxygen P = phosphorous K = potassium I = iodine N = nitrogen S = sulfur Ca = calcium Fe = iron Mg = magnesium Na = sodium Cl = chloride

Inter/IntraMolecular Forces

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3 Types of bonds: [IONIC, COVALENT, METALLIC] ---> Intramolecular forces INTERmolecular Forces: Force of attraction between molecules Ionic > [Hydrogen Bonding > Dipole-Dipole > LDF] <---Covalent A. Dipole-Dipole 1. Definition - Positive (Polarity) seeks negative 2. Happens between POLAR molecules EX: HCl attracts HCl H-Cl --><-- H-Cl B. Hydrogen Bonding 1. Definition - Attraction between Hydrogen atoms and unshared electrons of Hydrogen (H), Oxygen (O), or Florine (F). 2. STRONG attraction <---IMPORTANT 3. Holds DNA strands together EX: H2O attracts H2O (Dipole-Dipole is there too) HAVE POLARITY C. London Dispersion Forces (LDF)

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