Chapter 2 - Atoms, Molecules and Water
Chapter 2 - Atoms, Molecules and Water Biology 105
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This 0 page Bundle was uploaded by Ashley-Maria Farnen on Tuesday November 10, 2015. The Bundle belongs to Biology 105 at Indiana University of Pennsylvania taught by in Summer 2015. Since its upload, it has received 31 views. For similar materials see Cell Biology in Biology at Indiana University of Pennsylvania.
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Date Created: 11/10/15
Bio Notes Week 3 1 Chapter 2 Atoms Molecules and Water a Comparisons of Terms i Element Substance that cannot be broken down to another substance with different properties ii Atom Smallest unite that had characteristic properties of the element iii Molecule Two or more atoms joined by chemical bonds b Composition of an atom i Nucleus 1 Proton positively charged particles 2 Neutron uncharged particles n or i 3 Number of protons Number of neutrons Atomic mass 4 Number of protons Atomic Number 5 Electrons negatively cambun mam charged particles Enema Ea 6 Number of elctrons b fIEt talll 39 quot number of protons f Nucleus 7 Each electron circles the E39PW EWEW 39 r neutrons lll39I39 nuclus in an orbit l 3 representing a speci c energy level 8 ln forming molecules atoms combine to ll their outer energy level c Chemical Bonds Forces holding atoms together i lonic Bond One atom looses an electron another gains an electron ii Covalent Bond Atoms share electrons iii Polar Covalent Atoms share electrons unequally iv Hydrogen Bonds Covalentlybound hydrogen is attracted to another atom d Hydrogen Bonds Join Water Molecules i Water molecules carry slight charges ii Electrons favor 0 over H iii Hydrogen bonds form between 0 of one water molecule and H of another e Due to hydrogen bonding water shows i Surface tension concentration of hydrogen bonds at air water interface 1 Cohesion water molecules associate with each other ii Capillary Action movement of water through a tube by cohesion and adhesion 1 Adhesion water molecules associate with other molecules or surface iii Imbibition movement of water into wood or gelatin by capillary action Due to hydrogen bonding water resists temperature change i Water has high values for 1 Speci c Heat heat needed to change temperature 2 Heat of Vaporization heat needed to convert liquid to gas Water as a Solvent i Substances that dissolve in water hydrophilic 1 Polar 2 Ionic ii Substances that are insoluble in water hydrophobic 1 Nonpolar Dissociation i A few water molecules naturally dissociate into ions ii Hydroxide ion is negative and basic iii Hydrogen ion is positive and acidic Applying your knowledge i What would be chemical formula if magnesium and chlorine unites to form a molecule MgMagnesium CChlorine 1 MgCLz ii Which electrons from each atom are involved in forming the bonds 1 One electron form outer shell of Mg is donated to one CI and the other electron from MG is donated to the other CI
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