2.1 - Water - What does life require?

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PrayerHeals
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240604
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2.1 - Water - What does life require?
Updated:
2013-10-14 18:28:59
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Biology
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  1. Living Organisms can include what attributes?
    • Growth 
    • Movement
    • Reproduction
    • Response to external environment stimuli 
    • Metabolism
  2. Define: Metabolism
    All of the chemical process that occur in cells, including the breakdown of substances to produce energy, the synthesis of substances necessary for life, and the excretion of waste generated by these processes.
  3. What is homeostasis?
    Roughly constant internal environment despite an ever changing external environment
  4. The ability to maintain homeostasis requires:
    -Complex feedback mechanisms between multiple sensory and physiological systems and is possible only in living organisms.
  5. What is a requirement for lfe?
    water
  6. What are the 2 elements that what is made up of?
    • hydrogen
    • oxygen
  7. Elements are the fundamental forms of _______ and are composed of _______ that cannot be broken down by normal physical means such as boiling.
    Elements are the fundamental forms of MATTER and are composed of ATOMS that cannot be broken down by normal physical means such as boiling.
  8. Atoms are the smallest units that have the properties of any given ________.
    element.
  9. Atoms are composed of subatomic particles called:
    • protons
    • neutrons
    • electrons
  10. Protons have a _____ electric charge
    POSITIVE
  11. Neutrons have a ________ electric charge
    uncharged (0)
  12. What makes up the  nucleus of an atom?
    protons and nuetrons
  13. What gives an element their atomic number?
    The number of PROTONS. 

    *All atoms of a particular element have the same number of protons.
  14. Electrons have a _______ charge.
    NEGATIVE
  15. Where are the negatively charged electrons found in relation to the nucleus?
    Outside in the nucleus in an electron cloud.
  16. What are electrons attracted to?
    positively charged nucleus.
  17. To be considered a neutral atom what must happen?
    There must be an equal number of electrons and protons.
  18. Define ion:
    Electrically charged atom
  19. Water, like other molecules, consist of 2 or more _____ joined by ______ bonds. 
    Water, like other molecules, consist of 2 or more ATOMS joined by CHEMICAL bonds.
  20. A substance that dissolves when mixed with another substance is called
    Solute
  21. When a solute is dissolved in a liquid (such as water) the liquid is called a
    solvent
  22. What makes water a good solvent?
    It is polar.
  23. Define: Polar
    Different regions or poles of the molecule have different charges.
  24. Define: Electronegative
    The tendency to attract electrons to form a chemical bond.
  25. Why is the water polar?
    Oxygen is more attractive to electrons.
  26. Electrons in a _______ molecule spend more time near the ______ of the oxygen atom than near the nuclei of the hydrogen atoms.
    • water
    • nucleus
  27. When atoms of a molecule carry no partial charge they are said to be:
    nonpolar
  28. Hydrogen Bond
    Is a weak chemical bond 

    Forms when a partially positive hydrogen bond atom is attracted to a partially negative atom.
  29. Hydrophilic
    • Water loving 
    • Ability to dissolve in water
  30. Hydrophobic
    • water-fearing
    • -Do not contained charged atoms 
    • -They do not easily mix with water
  31. Chemical reactions are facilitated by
    water
  32. Chemical Reactions - Define:
    Changes in the chemical composition of substances.
  33. Reactants - Define:
    Any starting material in a chemical reaction.
  34. What are the molecules formed as a result of a chemical reaction?
    products
  35. What is cohesion?
    The tendency of like molecules to stick together.
  36. Cohesion is much stronger in _____ than in most liquids because of the sheer number of hydrogen bonds.
    Water
  37. stop at pg 34

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