Week 2 notes
Week 2 notes Biol 120-004
Popular in General Biology
Popular in Biological Sciences
This 3 page Class Notes was uploaded by Lauren Teeple on Sunday September 6, 2015. The Class Notes belongs to Biol 120-004 at Towson University taught by Dr. Burks in Fall 2015. Since its upload, it has received 15 views. For similar materials see General Biology in Biological Sciences at Towson University.
Reviews for Week 2 notes
The content was detailed, clear, and very well organized. Will definitely be coming back to Lauren for help in class!
-Lucas Donnelly IV
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/06/15
Chemical Basis of Life I Biology 0 Characteristics of living things 1 Organlzatlon cell structure m 2 Metabolism acquire materials and energy from environment 3 Homeostasis ability to maintain internal stability l 4 Response internal and external stimuli 5 Reproduction and Development produce offspring growth maturation and development 6 Adaptation become more suitable for environment over generations overtime Do all living things have all of these characteristics of life If no give an example Yes Do nonliving things have any of the characteristics of life If yes give an example Yes organization and metabolism energy II The Nature of Matter 0 What is matter Has wand takes up 3 o What is NOT matter Time sound love energy and memories 0 What are elements 0 All matter is composed of elements I An element is a substance that cannot be broken down into another substance by ordinary chemical means 0 There are 98 naturally occurring elements 0 6 elements make up 98 of body weight of most organisms including humans I What are these six elements Carbon Nitrogen Hydrogen Oxygen Phosphorus and Sulphur Nucleus r W Protons 0 Chemical bonds 0 o Molecules I 2 or more elements bonded together 7 Neutrons O 0 Compound I A molecule that contains at least 2 different elements I All compounds are molecules 0 Can be bound together by I Ionic bonds 0 Bond formed when 2 elements gainloss electrons elements are held together by the attraction between opposite charges 0 These bonds create ions charged element 0 Lose of electrons creates positive 0 Gain of electrons creates negative 0 It looks like a cluster of oppositely charges ions I Covalent bonds 0 Bond formed when 2 elements share electrons 0 Neutral Neutrons neutral Protons positive Electron negative Ill Water s Importance to Life I 0 Structure of water 0 What is the overall charge of water Neutral slightly charged o Polarity of water lH 0 5 539 o Polarity of water causes water molecules to be attracted to one another I Positive hydrogen atoms in one water molecule are attracted to the negative oxygen atom of another water molecule creating HydrOgen Bonds 0 Properties of Water 0 The polarity of water and ability of it to form hydrogen bonds make it unique and able to support life Property of Water Explanation Biological Importance Water can dissolve a lot of solid substances and Can break down substances and nutrients Can Solvency mixes well With many d1ssolve 10ns and nutr1ents 1n 1t liquids Water molecules clin to CoheSIon amp g Capillary action pulls up water Allows travel each other amp other adheSIon through trees and bOdIES molecules It takes a lot of heat to Allows bodies and oceans to maintain High Heat Capacity change the temperature temperatures Can absorb heat without changing of water temperature Slow to heat up and cool down Liquid water is more Density allows aquatic life to be able to live Ice Densit y dense than frozen water floats which permits life In water underneath Solvency Hydrophilic it likes water polar and ionized molecules Hydrophobic molecules not attracted to water nonpolar and nonionized molecules Cohesion sticks to itself due to hydrogen bonds Adhesion sticks to other things clings to other polar molecules IV The pH Scale I What is pH 0 When water dissociates it releases hydrogen ions H and hydroxide ions OH 0 Potential of Hydrogen pH I Indicates the number of H in a solution when it dissociates in water I Neutral Solutions 0 When a neutral solution dissociates it releases an equal number of hydrogen ions H and hydroxide ions OH 0 Example 7 ph I Acid Solutions 0 Acids are substances that dissociate in water releasing hydrogen ions 0 Example 6 and below ph Low OH and high H I Basic Solutions 0 Bases are substances that increase the amount of hydroxide ions OH I Also referred to as alkaline 0 Example 8 and up ph Low H and high OH I Neutralization 0 To neutralize an acid add a base 0 To neutralize a base add an acid pH scale 0 Label acidic basic neutral high H low H high OH low OH l lgk Low H 393 L VV0012 3 4 5 6 7 8 91011121314 113141 WQMHMV ccj of 0quot I Why is pH important 0 Helps maintain organ health blood is 735 to 745 ph 0 Optimal for proper body functions 0 Controls acid rain and ocean acidification 0 Ph changes with the food we consume and with organ health and illness
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'