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Hydrogen

Campbell Biology Chapter 3

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? 2017 Pearson Education, Inc. Lecture Presentations byNicole Tunbridge and Kathleen Fitzpatrick Chapter 3Water and Life The Molecule That Supports All of Life Water makes life possible on Earth Water is the only common substance to exist in the natural environment in all three physical states of matter Water?s unique emergent properties help make Earth suitable for life The structure of the water molecule allows it to interact with other molecules ? 2017 Pearson Education, Inc. Concept 3.1: Polar covalent bonds in water molecules result in hydrogen bonding In the water molecule, the electrons of the polar covalent bonds spend more time near the oxygen than the hydrogen The water molecule is thus a polar molecule:The overall charge is unevenly distributed

Chapter 7 Chemistry Notes

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Chapter 7 7-1 symbol? an abbreviation for the name of the element Chemical formula? a type of notation made with numbers and chem. Symbols To indicate the composition of a compound To indicate the number of atoms in one molecule of an element molecule? a single atom, a group of 2+ atoms of the same element, or a group of atoms of different elements that have combined to form a compound Monoatomic molecules? molecules with one atom Diatomic molecules? two atom molecules Hydrogen, oxygen, nitrogen, chlorine, fluorine, bromine, Iodine When writing the formula for a molecule of an element, write the number of atoms in each molecule as a subscript just after the symbol The formula of a compound tells 2 things: The element making up the compound

water biofact sheet

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The Biological Importance of Water B io F actsheet September 1998 Number 30 1 Water is a polar molecule i.e. it has both positively charged and negatively charged areas. Water is made up of two positively charged hydrogen atoms and one negatively charged oxygen atom (Fig 1). Water (H2O) is the most abundant molecule in cells, whole organisms and on earth. This is a consequence of the unique physical and chemical properties of water. This Factsheet will briefly explain the significance of these physical and chemical properties, then discuss the primary roles of water in animals and plants. As a result of this polarity (the uneven distribution of charges), adjacent water molecules are attracted to and become bonded to each other. The

Campbell Biology Chapter 3 outline

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#AP Bio #CampbellBiology #Chapter 3 #Outline

CHAPTER 3 ? WATER AND LIFE THE MOLECUES THAT SUPPORT ALL OF LIFE Water is the only natural substance to exist in all 3 states of matter: Solid Liquid Gas WATER molecule is a polar molecule It has a positive and a negative end It can make up to 4 Hydrogen bonds that break and reform instantaneously. 4 Emergent properties of water COHESION The linking together of like molecules, often by hydrogen bonds. Water sticks to itself Adhesion- water sticks to something else Surface Tension ? A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules MODERATION OF TEMPERATURE BY WATER HEAT AND TEMPERATURE Kinetic Energy ?

Chapter 3 Notes

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BIOL 1020 - CHAPTER 2 LECTURE NOTES Chapter 2: The Chemical Context of Life You must understand chemistry to understand life (and to pass this course)! Elements and Atoms Elements ? substances that cannot be further broken down into other substances (at least by ordinary chemical reactions) every element has a chemical symbol (H for hydrogen, O for oxygen, etc.); this is most familiar from the periodic table Essential elements: elements that an organism needs to live. They are similar along different organism but there is some variation Trace element: elements that are required by an organism in only minute quantities E.g.: Iron (Trace) Oxygen, Hydrogen, Nitrogen, and Carbon(Essential elements)

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

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