NAME________KEY_____________ Atmospheric Sciences 211 January 5, 2004 Math/Chem Quiz (This does not count toward your grade) Do not use an electronic calculator. 1. Arithmetic (a) 25% of 80 = 20 (b) 2.0/0.1 = 20 (c) 33 = 27 (d) 491/2 = 7 (e) 20 ×1084 ×10−3= 5 x 1011 2. Express in scientific notation (i.e. as a power of 10): (a) 0.0023 = 2.3 x 10-3 (b) 250000 = 2.5 x 105 3. Geometry and Trigonometry (a) The area of a circle of radius r is πr2 (b) The surface area of a sphere of radius r is 4πr2 (c) sin θ = a/b, b/a, a/c, b/c, c/b [circle the correct answer] b/c c θ baContinued over….4. Algebra P= CR2T4; solve for T 42CRPT = 5. Functions. Multiple choice: put the appropriate letter (a, b, c, or d) in front of each equation. Assume r is a positive constant. c y = r/t d y = tr b y = rt a y = rt (a) y increments exponentially with t (b) y is proportional to t (c) y is inversely proportional to t (d) y has a power-law dependence on t 6. Conversion of units (a) If your car can travel 20 miles on a gallon of gas, and there are 4 quarts in a gallon, how many quarts are used on a 30-mile trip? 6 quarts (b) In a hypothetical country with 250 million people, the annual budget of the federal government is 1 trillion dollars (i.e., one thousand billion dollars). What is the per-capita federal budget (i.e., what can an average person expect to pay in taxes)? $4,000. 7. Basic chemistry (a) Consider the following chemical reactions: (1) CO2 + H2O = CH2O + O2 (2) NO + O3 = NO2 + O2 For reaction (1), there is/are _3_ type(s) of atom(s) and _4_ type(s) of molecule(s) For reaction (2), there is/are _2_ type(s) of atom(s) and _4_ type(s) of molecule(s) (b) In what way(s) is 12C different from 14C (circle all those that are appropriate)? (a) number of electrons (b) temperature (c) mass (or atomic weight) (d) number of
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