Bio ch 2 fixed

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Danielvu28
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129090
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Bio ch 2 fixed
Updated:
2012-01-19 19:49:44
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fixed bio
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  1. What are the 3 particles that make up an atom?
    protons, neutrons, electrons
  2. Which particles move in the space around the nucleus?
    ELECTRONS
  3. What is atomic number?
    Proton Number
  4. What is a mass number?
    proton number + neutron number
  5. What is the definition of isotope
    Isotopes have the same number of protons and are the same element but have a different number of neutrons in the nucleus
  6. What is a compound?
    • A SUBSTANCE FORMED BY THE CHEMICAL JOINING OF TWO OR MORE ELEMENTS IN DEFINITE
    • AMOUNTS
  7. How is a positive ion formed?
    AN ATOM LOSES ONE OR MORE ELECTRONS
  8. How is a negative ion formed?
    AN ATOM GAINS ONE OR MORE ELECTRONS
  9. What creates a covalent bond?
    SHARING OF ELECTRONS between atoms
  10. What happens during a chemical reaction?
    ATOMS REARRANGE
  11. Given a generic reaction A + B -> C + D what chemicals are the reactants?
    A&B
  12. What is the definition of a chemical reaction?
    The process that changes one set of chemicals into another set of chemicals.
  13. For the reaction profile graphs, how can you identify a reaction that absorbs energy?
    THE CURVE RAMPS UPWARDS/THE PRODUCTS HAVE A HIGHER ENERGY THAN REACTANTS (see p. 51)
  14. What is the atomic composition of water?
    2 HYDROGEN ATOMS linked to 1 OXYGEN ATOM
  15. In the reaction below (the synthesis of water), what is water?
    2 H2 + O2 2 H2O
    THE PRODUCT
  16. Describe the polarity of the water molecule.
    • THE OXYGEN HEMISPHERE IS SLIGHTLY NEGATIVE AND THE HYDROGEN HEMISPHERE IS SLIGHTLY
    • POSITIVE.
  17. In sugar water, what is the sugar?
    A Solute
  18. How would you classify a mixture made by adding salt to boiling water?
    A solution
  19. When any cells are mixed in water, what forms?
    A suspension
  20. What are acidic phs?
    Below 7
  21. What are basic phs?
    Above 7
  22. Which pH is neutral?
    7
  23. How are acids destribed?
    Have more H+ than OH- in solution
  24. How are bases described?
    Have more OH- than H+
  25. How are neutral solutions described?
    Have equal concentrations of H+ and OH-
  26. What makes Carbon Special?
    Carbon has a valence of 4 and can bond to one another and form a lot of different structures
  27. How many bonds can Carbon Form?
    Four
  28. Which are the predominant atoms in biomolecules?
    C = carbon/H = hydrogen/O = oxygen/P = phosphorus/N = nitrogen
  29. Amino acids link to form a protein. What is formed when simple sugars link?
    Starch
  30. What are 3 key functions of proteins?
    • -They help fight disease (ex. Anitbodies are proteins.)
    • -They control the rate of reactions (ex. Enzymes are proteins.)
    • -They move substances into or out of cells. (ex. Membrane proteins can act as pumps.)
  31. What are 3 falsehoods/un-truths about catalysts?
    • -Catalysts slow down the rate of reaction.
    • -All catalysts are enzymes
    • -Catalysts are consumed or used up during a chemical reaction.
  32. What are basic accurate facts about enzymes?
    • -Enzymes work best at a specified pH.
    • -Enzymes are proteins.
    • -The shape of the enzyme allows it to do its job.

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