practice test 4

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practice test 4
2011-02-23 16:27:10

aamc 4 cards
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  1. What is the common ion effect?
    An effect which results when two substances which both ionize to give the same ion are inbolved in a chemical equilibrium. The solubility of a sparingly salt is reducd in a soln that contains an ion in common with that salt.
  2. Law of conservation of mechanical energy?
    Describes the relation of a system; an increase in one requires the decrease in the other.
  3. What is friction?
    The attractive molecular forces acting between material surfaces in contact.
  4. Relationship between kinetic friction and static friction.
    The coefficient of kinetic friction is always lower than that of static friction. Therefore there is a net acelerating force on the block once it starts to slide. A constant force on a mass produced a constant acceleration (newtons second law). Thus, velocity increases linearly with time.
  5. What is the Doppler Effect?
    The frequency shift of the doppler effect for waves depends on the relative motion of the source and detector. the condition that gives the same shift as the case of the stationary obj is the one with the same relative velocity.
  6. As distance between the waves increase...(what happens to wavelength?
    wavelength lengthens (doppler effect)
  7. What is the Doppler equation for frequency?
    (delta)f/f = -v/c
  8. (T/F) When there is no relative motion between the jets, there is no frequency shift.
  9. The pressure in a liquid due to the gravitational force of the liquid above a given depth is proportional to the density and the depth.
  10. Does melting occur at a constant temperature?
    Yes because a certain amt of energy, the latent heat of fusion, is needed to convert a substance from its solid to liquid state. The temp of the metal will not increase above its melting point until all of the metal has melted.
  11. What do conjugate acids and bases differ in?
    presence or absence of a proton
  12. What does the empirical formula show?
    The empirical formula shows the lowest whole number ratio of moles of each element in a mole of the compound, or the corresponding number of atoms per molecule.
  13. Mechanical waves in a medium function to transport?
    Energy only. They are a local oscillation of material. the oscillating material does not move far from its initial equilibrium position
  14. What do the PS and S nerves release and how do they affect the pupils?
    • PS--> acetylcholine--> pupil constricts
    • S--> norepinephrine--> pupil dilates
  15. What are the autonomic nerve fibers that innervate the heart to slow it?
    The PS motor fibers of the vagus nerve. sympathetic motor fibers increase heart rate and sensory fibers carry info from the heart to the central nervous system.
  16. Amine, Amide, Carboxylic acid, and nitro. Which are soluble in dilute acid or base?
    Amine and Carboxylic acid.
  17. When hydrolyzed in base and then acidified, an ester yields what?
    An alcohol and a COOH.
  18. What are the two primary factors that normally determine the level of blood pressure?
    The cardiac output (strove volume x heart rate) and the resistance to blood flow. Cardiac input determines the amt of blood pumped into the system by the heart per unit time.
  19. Most fungal spores are metabolically inactive/active and diploid/haploid.
    Metabolically inactive and haploid
  20. What is saponification?
    Saponification is hydrolysis of an ester using aqueous hydroxide.
  21. Why is a different base often used for a second alkylation of acetoacetic ester?
    the active hydrogen of the monoalkylated product is less acidic. thus, a stronger base may be needed to abstract this proton.
  22. Inflation of the lungs in mammals is accomplished by...
    negative pressure pumping action- pressure that is lower that tm is generated within the alveolar sacs.
  23. An organism is likely to be a bacterium rather than a virus if it...
    reproduces via fission. viruses reproduce by replicating within a host cell and thus cannot be said to reproduce by fission
  24. For a virus to reproduce itself in host cells, its RNA must be converted to DNA, which requires...
    reverse transcriptase
  25. (T/F) An open pipe has its fundamental resonant wavelength at twice the length of the pipe.