The pKa of acetic acid, HC2H3O2, is 4.75. What is the pH of a buffer in which [HC2H3O2] = 0.20 M and [NaC2H3O2] = 2.0 M?
A) 3.75
B) 4.75
C) 5.75
D) 7.00
C
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Within the crater is a “fire pit” named Halemaumau. This pit has varied in size during eruptions. What is the relief from the rim of Halemaumau to the 3412-foot benchmark on the floor of the pit?
What will be an ideal response?
A glacier covering at least 50,000 km2 and unconfined by topography is classified as a(n) ____
a. ice cap b. continental glacier c. moraine d. cirque e. valley glacier
Many species of hoofed animals can live together in the African tropical savannas because they have ____ eating habits that ____ competition for resources
a. specialized, maximize b. specialized, minimize c. generalized, maximize d. generalized, minimize e. similar, facilitate
Which of the following best matches the description?Comparative percentages of different age groups within a population.
A. dispersal B. immigration C. carrying capacity D. death phase E. density-independent factor F. population density G. emigration H. density-dependent limiting factor I. biotic potential J. r-strategist K. age distribution L. environmental resistance M. lag phase N. K-strategist O. exponential growth phase P. stable equilibrium phase